1. ## Pumping up your Car's tires with a bike pump

Okay guys, I'm having a huge debate with a guy at autozone...Here it is:

In passing conversation I told him that I was planning on adding air to my car's tires with my bike pump. He immediately told me that was stupid and dangerous.

Me: Why dangerous. I could see you saying it'll take a while, but it shouldn't be dangerous.

Him: Your car weighs over a ton. Each tire holds up a quarter of that. There is no way your little bike pump will be able to withstand that weight.

Me: The weight should be fully represented by the PSI. My bike pump can go to 150+ PSI I think. My car's tires are at 35 PSI.

Him: You're forgetting about the weight of the car.

Me: Nope, it's what's driving the PSI.

Him: That's just the pressure, what about the weight?

Me: Arghhhh

Okay, I'm 90% sure I'm right here, but given how adamant he was that I'd hurt myself and/or my car, I thought I'd check with the gang here. Can you spot any flaws in my logic or did I miss something?

P.S. In terms of how many more pumps, I'm thinking that given equal PSI, volume differences should drive # of pumps (effort). I estimate my tire has say 5-10x the volume of my bike tire, so adding air should take me ~3-5 min of pumping. Does anyone do this occasionally?

2. He's an idiot. PSI is psi.

Morgan

3. lol arguing with someone at autozone is dumb.

ps, did you buy the lucas oil treatment and the brake squeal stop paste at the counter too?

psi is psi, I air up slicks with a bike pump when I don't have a compressor handy. It does take noticeably longer though.

4. I did it for a while before I finally plugged a hole in my tire.

Autozone employees work there for a reason.

5. "What about the weight?" LOL.

If you want to return to help him, the weight is spread out over the contact patch of the tire with the ground. The lower the pressure, the larger the contact patch. A 4000lb car with 40psi in the tires will have exactly 100 square inches of contact patch distributed over the four tires.

If you want to drive that car on the beach, you can lower the pressure in the tires to 20psi and get double the contact patch so it won't sink so far down into the sand. We regularly run 10psi in our tires on Pismo. It's almost impossible to get stuck. You're floating.

Math is beautiful.

6. Good one

On other side it took me forever to just "add" some air with floor pump when I found slow leak in remote location.

7. Originally Posted by Neela
P.S. In terms of how many more pumps, I'm thinking that given equal PSI, volume differences should drive # of pumps (effort). I estimate my tire has say 5-10x the volume of my bike tire, so adding air should take me ~3-5 min of pumping. Does anyone do this occasionally?
Bwahahahahah. Good luck there. Unless it's a little 14" skinny skinny snow tire, it has way way more than 5-10x the volume.

I pumped up a 16" tire from ~10psi up to ~30psi one time with my old Silca Pista pump and it took forever (had a slow leak from a nail and needed to get the car to the shop). There was a bit of danger ... the pump barrel got too hot to touch after a couple hundred pumps.

I pump up our wheelbarrows tire with the bike pump these days, and anything bigger gets the compressor.

8. ## The only danger....

Originally Posted by Neela
Okay guys, I'm having a huge debate with a guy at autozone...Here it is:

In passing conversation I told him that I was planning on adding air to my car's tires with my bike pump. He immediately told me that was stupid and dangerous.

Me: Why dangerous. I could see you saying it'll take a while, but it shouldn't be dangerous.

Him: Your car weighs over a ton. Each tire holds up a quarter of that. There is no way your little bike pump will be able to withstand that weight.

Me: The weight should be fully represented by the PSI. My bike pump can go to 150+ PSI I think. My car's tires are at 35 PSI.

Him: You're forgetting about the weight of the car.

Me: Nope, it's what's driving the PSI.

Him: That's just the pressure, what about the weight?

Me: Arghhhh

Okay, I'm 90% sure I'm right here, but given how adamant he was that I'd hurt myself and/or my car, I thought I'd check with the gang here. Can you spot any flaws in my logic or did I miss something?

P.S. In terms of how many more pumps, I'm thinking that given equal PSI, volume differences should drive # of pumps (effort). I estimate my tire has say 5-10x the volume of my bike tire, so adding air should take me ~3-5 min of pumping. Does anyone do this occasionally?
... is throwing out your back. You can do it, it just takes a while and a metric buttload of pumpstrokes. I had to do it with my mini spare once. I actually keep a floor pump in my car at all times for riding.

Originally Posted by redmr2_man

ps, did you buy the lucas oil treatment and the brake squeal stop paste at the counter too?

I still can't believe they sell something to intentionally make your motor oil foam up. Oil is a way better lubricant than air.

9. I think the weight is factored right into the P in PSI. The real danger in pumping up your car tire with a bicycle pump is some sort of repetitve motion injury like carpal tunnel...

a 30" car tire thats 8" wide with a 16" rim has a little over 4k in^3 and (assuming your not on a niner) mtb has a 21 inch rim and 26" tires roughly 2.25 wide so should have a volume around 400 in^3. Around 10 times the volume, you'd be pumping forever. The MTB tires are probably even a little less, I just figured them with square shoulders more like a car tire....

10. Originally Posted by Fast Eddy

If you want to return to help him, the weight is spread out over the contact patch of the tire with the ground. The lower the pressure, the larger the contact patch. A 4000lb car with 40psi in the tires will have exactly 100 square inches of contact patch distributed over the four tires.
It's probably more complicated than that. A tire with 0psi in it doesn't have an infinite contact patch (or a 1000sq in at 1psi), and a run flat tire can maintain a usable contact patch without air.

11. Originally Posted by anotherbrian
It's probably more complicated than that. A tire with 0psi in it doesn't have an infinite contact patch (or a 1000sq in at 1psi), and a run flat tire can maintain a usable contact patch without air.
Can you ever really have 0 psi?

12. Originally Posted by anotherbrian
It's probably more complicated than that. A tire with 0psi in it doesn't have an infinite contact patch (or a 1000sq in at 1psi), and a run flat tire can maintain a usable contact patch without air.
Kidding, of course. I thought PSI was the force exerted on the area of the tire by the gas and not the weight of the item being supported. You know, your tire pressure is the same whether the car (or bike) is airborne or on a workstand or lift or whatever.

13. The handle of the pump will blast out the top, killing you instantly.

14. Don't forget that most car tires have schraeder valves

15. Originally Posted by Finch Platte
The handle of the pump will blast out the top, killing you instantly.
True, BUT...Air is forced out of the tire through the now busted pump so fast that it creates a tear in the Time Space Continuum that sucks your now deceased body into an alternate, but perfectly identical dimension. There you will no longer be deceased and unable to inflate a car tire with a floor pump. It will, however, take you a really really really long time to inflate the tire. By the way you will have no knowledge of your alleged death in this dimension and no one here will have any recollection of you, so....now you have been warned.

16. Originally Posted by EBrider
Don't forget that most car tires have schraeder valves
So does my Rockhopper.

17. Done it! 30psi from dead flat on a Corolla; full size tire, 1980 Medai floor pump. Enough to get to a gas station.

Works great, just exactly like you know it will. Also a helluva lot o' pump strokes, just exactly like you expect. More of a wrist workout than I would care to experience again, especially post bumpy ride.

Made me buy one of those little cigarette-lighter plug-in emergency compressors, which of course I've never needed in the 9 years since I bought it.=P

I never knew about that Time-Space Continuum anomaly, though. Who could predict these awesome things?

18. Originally Posted by GrayBeard Pirate
True, BUT...Air is forced out of the tire through the now busted pump so fast that it creates a tear in the Time Space Continuum that sucks your now deceased body into an alternate, but perfectly identical dimension. There you will no longer be deceased and unable to inflate a car tire with a floor pump. It will, however, take you a really really really long time to inflate the tire. By the way you will have no knowledge of your alleged death in this dimension and no one here will have any recollection of you, so....now you have been warned.

19. Should have asked him if he knew how his hydraulic lift/jacks worked.

Anyways, IF he was right (which he wasn't), you could have just taken the jack out of your trunk, lifted the wheel off the ground and pumped away.

20. Originally Posted by Finch Platte
Sorry....its not riding induced insanity.

21. As long as the car doesn't run over the pump, you'll be fine.

22. Originally Posted by anotherbrian
It's probably more complicated than that. A tire with 0psi in it doesn't have an infinite contact patch (or a 1000sq in at 1psi), and a run flat tire can maintain a usable contact patch without air.
As soon as the tire is flat the place where the metal rim contacts the ground begins to have a very high PSI. Since the rim doesn't deform, the equation is no longer applicable..

23. you should have bet him for money

24. Originally Posted by morganfletcher
He's an idiot. PSI is psi.

Morgan
I'm going to rule with the AutoZone guy,

I beg to differ. There are more energy stored in a tire @ 30 psi then a bike tire @ 30 psi.

A good example, a garden hose flows at 9 gals per minute. That wont move your car or threw your bike accross the street at that volume. Now compare that to a river flowing 9 gal per minute. Your car will wash away in seconds.

Given the same PSI, more volume means it's more dangerous.

PV=nRT ... Pressure X Volume = N (constant since it's air) R (constant since it's air) Temperture (constant since it's at the same time)

Tire Pressure X Tire Volume = Pump Pressre X Pump Volume ...

I found someone calculated tire volume to be 10 litres. 1 liter = .264 Gallons to 10 litre is 2.64 Gallons

Floor bike pump = 24 inches tall by 1 inch cylinder: Volume = pi x radius ^ 2 x height = 3.14 x .5 inch x .5 inch x 24 inches = 18.84 cubic inch : 1 gallon = 231 cubic inches : .08 Gallons

PV = PV ... tire (30 PSI) X (2.64 Gallons of air in a tire) = bike pump (X PSI) X (.08 Gallons of air in a bike pump).

Bike pump (X PSI) = 30 PSI X 2.64 Gallons / (.08 Gallons) = 990.0 PSI.

YES, your pump will handle 990 PSI!!! That's safe. Grab the handle tight.

How does that involve the car's weight .. If your remove the tire off the car, PSI drops down a bit. I know that on my camper, with empty truck bed, tire pressure is at 60 psi, once the 2400 lbs thing is on, it jumps to 80 psi!!!

So the AutoZone guys is right!!!

25. Originally Posted by Buzzaro
Kidding, of course. I thought PSI was the force exerted on the area of the tire by the gas and not the weight of the item being supported. You know, your tire pressure is the same whether the car (or bike) is airborne or on a workstand or lift or whatever.
The weight of an item will cause the tire to deform ... aka flatten the tire. Since the tire can't expand else where (steel belts reenforcement), it will cause the pressure to increase since it now has less volume with the same amount of air molecules. PV = nrt = PV.

26. Originally Posted by SunGuy
So the AutoZone guys is right!!!
I can't tell if you're joking or not...

This is the case where a little math knowledge is dangerous.

If you take all the air molecules out of the tire and cram them into the bike pump volume, then sure, it will be 990 PSI. But you're not. With each stroke you're putting a little bit of air into the tire at a time. Not all at once, or vice versa. Even if the check valve in the pump broke your pump will be at the same pressure of the tire, 30 PSI.

27. Originally Posted by presslab
I can't tell if you're joking or not...
I wasn't joking. I believed the AutoZone guy is right in the theoretical world.

Originally Posted by presslab
This is the case where a little math knowledge is dangerous.

If you take all the air molecules out of the tire and cram them into the bike pump volume, then sure, it will be 990 PSI. But you're not. With each stroke you're putting a little bit of air into the tire at a time. Not all at once, or vice versa. Even if the check valve in the pump broke your pump will be at the same pressure of the tire, 30 PSI.
I have LOTS of math knowledge. If I only took one more upper division course in college, I would have a minor in Math.

If the check valve fails, it will equalized to 30 psi OVER TIME, BUT with the instantaneous rush of air into the pump handle, it will fly up and hit you in the face, neck or eye!!! or worst .. BALLS.

Have mythbuster done this yet? This should be a good episode.

28. Originally Posted by SunGuy
I'm going to rule with the AutoZone guy,

I beg to differ. There are more energy stored in a tire @ 30 psi then a bike tire @ 30 psi.

A good example, a garden hose flows at 9 gals per minute. That wont move your car or threw your bike accross the street at that volume. Now compare that to a river flowing 9 gal per minute. Your car will wash away in seconds.

Given the same PSI, more volume means it's more dangerous.

PV=nRT ... Pressure X Volume = N (constant since it's air) R (constant since it's air) Temperture (constant since it's at the same time)

Tire Pressure X Tire Volume = Pump Pressre X Pump Volume ...

I found someone calculated tire volume to be 10 litres. 1 liter = .264 Gallons to 10 litre is 2.64 Gallons

Floor bike pump = 24 inches tall by 1 inch cylinder: Volume = pi x radius ^ 2 x height = 3.14 x .5 inch x .5 inch x 24 inches = 18.84 cubic inch : 1 gallon = 231 cubic inches : .08 Gallons

PV = PV ... tire (30 PSI) X (2.64 Gallons of air in a tire) = bike pump (X PSI) X (.08 Gallons of air in a bike pump).

Bike pump (X PSI) = 30 PSI X 2.64 Gallons / (.08 Gallons) = 990.0 PSI.

YES, your pump will handle 990 PSI!!! That's safe. Grab the handle tight.

How does that involve the car's weight .. If your remove the tire off the car, PSI drops down a bit. I know that on my camper, with empty truck bed, tire pressure is at 60 psi, once the 2400 lbs thing is on, it jumps to 80 psi!!!

So the AutoZone guys is right!!!
Wow, awesome. A for effort, but E for result. You should check out AutoZone's career site, they may be hiring.

29. Originally Posted by marzjennings
Wow, awesome. A for effort, but E for result. You should check out AutoZone's career site, they may be hiring.
Haha, I guess you're one of those people. You walk into a store feeling all smart like you know something and the sales person walks all over you and makes you feel like a dumbass. Then you go home and spent hours reading everything on the internet and come back trying to show you're smarter. HAHA.

30. Originally Posted by SunGuy
I have LOTS of math knowledge. If I only took one more upper division course in college, I would have a minor in Math.
Should have taken that last class.

31. Here is the answer. The PSI does not change when a tire is off the car or when loaded by the weight of the car.

Calculations found that it should rise from 30 psi to 30.3 psi when under the weight of the car. But no one can measure any change at all. The primary reason is the air is not supporting the weight of the car. It's really supporting the tire sidewall which supports the weight of the car.

fc

32. Originally Posted by SunGuy

I beg to differ. There are more energy stored in a tire @ 30 psi then a bike tire @ 30 psi.

A good example, a garden hose flows at 9 gals per minute. That wont move your car or threw your bike accross the street at that volume. Now compare that to a river flowing 9 gal per minute. Your car will wash away in seconds.

Given the same PSI, more volume means it's more dangerous.

PV=nRT ... Pressure X Volume = N (constant since it's air) R (constant since it's air) Temperture (constant since it's at the same time)

Tire Pressure X Tire Volume = Pump Pressre X Pump Volume ...

I found someone calculated tire volume to be 10 litres. 1 liter = .264 Gallons to 10 litre is 2.64 Gallons

Floor bike pump = 24 inches tall by 1 inch cylinder: Volume = pi x radius ^ 2 x height = 3.14 x .5 inch x .5 inch x 24 inches = 18.84 cubic inch : 1 gallon = 231 cubic inches : .08 Gallons

PV = PV ... tire (30 PSI) X (2.64 Gallons of air in a tire) = bike pump (X PSI) X (.08 Gallons of air in a bike pump).

Bike pump (X PSI) = 30 PSI X 2.64 Gallons / (.08 Gallons) = 990.0 PSI.

YES, your pump will handle 990 PSI!!! That's safe. Grab the handle tight.
There appears to be a fundamental misunderstanding of physics here. When you connect the pump to the tire, the pressures become equal, not the energy. Saying P1V1=P2V2 is wrong. Gas does not flow from low PSI to create high PSI. The pressure in the pump will not exceed the original PSI of the tire. I feel dumber for having had to explain this.

33. Originally Posted by SunGuy
If the check valve fails, it will equalized to 30 psi OVER TIME, BUT with the instantaneous rush of air into the pump handle, it will fly up and hit you in the face, neck or eye!!! or worst .. BALLS.
WOW...just WOW!

So imagine this.
A car on the ground with tires inflated to ~35psi.
I take the valve out of the valve stem. Air starts rushing out.
If I put my thumb over the valve stem opening are you saying that this ENORMOUS amount of energy will blow a hole through my thumb?

Force = Pressure x Area
35PSI on the 1/2" diameter plunger of the bicycle pump will only exhibit ~ 7lbs of force.
As for the 1/4 hole of the schrader valve...about 1.7 lbs of force.

"But what about the weight?!?!?" Ha ha ha

34. Originally Posted by beanbag
There appears to be a fundamental misunderstanding of physics here. When you connect the pump to the tire, the pressures become equal, not the energy. Saying P1V1=P2V2 is wrong. Gas does not flow from low PSI to create high PSI. The pressure in the pump will not exceed the original PSI of the tire. I feel dumber for having had to explain this.
I did misuse the equation. If you feel dumber, I feel dumbest (or most dumb). Life goes on!

35. Originally Posted by SunGuy
I did misuse the equation. If you feel dumber, I feel dumbest (or most dumb). Life goes on!

36. Originally Posted by tsimbu
WOW...just WOW!

So imagine this.
A car on the ground with tires inflated to ~35psi.
I take the valve out of the valve stem. Air starts rushing out.
If I put my thumb over the valve stem opening are you saying that this ENORMOUS amount of energy will blow a hole through my thumb?
Haha. I was so stuck in the math and used the wrong equation, I didn't even think about this.

I used a friend's tire machine last month to install a set of tires and I had to use my thumb to cover the valve stem after seating the bead. Yes, I still have my thumbs.

Damn AutoZone guy got me. Homedepot/Lowes guys get me all the time. Yes, I also one of those guys I get out of these stores and spent hours on the internet afterwards.

37. ## bike pump = cross training

I have and air compressor, but I always use a floor pump if I'm only topping off a few psi.

Perfect upper body workout for my spindly biker arms!

You should bring in your mini Zefal to the Auto Zone and tell him you use that - he would

really be impressed.

38. I've used my bike pump while at a gas station to pump up my car tires; the station didn't have a compressor. And like Francis said, I was made fun of. But at least I got my tire inflated.

39. Did the guy at Autozone know which aisle the blinker fluid is? I've been told that since my truck is 19 years old, it needs a topping off...

40. Originally Posted by d-bug
I've used my bike pump while at a gas station to pump up my car tires; the station didn't have a compressor. And like Francis said, I was made fun of. But at least I got my tire inflated.
i know my schit

there's a ton more on youtubes but let me stop there.

fc

41. Btw, it is illegal to charge for compressed air in CA gas stations. So although the tire pump machines ask for 2 quarters, you can go inside and ask the attendant for tokens for the tire pump.

fc

42. Once a volunteer trail worker had a flat when we got back to the cars (from driving like a the devil in rental car up the canyon after a storm - long story) and when we discovered it was flat we were three guys and the lady with the flat, and a bike pump.

I can't remember how we plugged the leak. Or was the spare flat...

We pumped up the tire in relay using a floor pump. It took us about ten minutes. I remember that. The fatigue was incredible. That's what I remember.

43. Originally Posted by beanbag
There appears to be a fundamental misunderstanding of physics here. When you connect the pump to the tire, the pressures become equal, not the energy. Saying P1V1=P2V2 is wrong. Gas does not flow from low PSI to create high PSI. The pressure in the pump will not exceed the original PSI of the tire. I feel dumber for having had to explain this.
I would listed to beanbag, he's a scientician. I saw him pump up a car tire with a bike pump and nothing bad happened, except that his seat post broke several days later. Draw your own conclusions...

44. Originally Posted by francois
Btw, it is illegal to charge for compressed air in CA gas stations. So although the tire pump machines ask for 2 quarters, you can go inside and ask the attendant for tokens for the tire pump.

fc
I've heard the same thing about those machines here in Pennsylvania. A friend of mine told me that it holds true anywhere in the country - not just PA or CA. I've never tried it though.

45. Originally Posted by SunGuy
I wasn't joking. I believed the AutoZone guy is right in the theoretical world.

I have LOTS of math knowledge. If I only took one more upper division course in college, I would have a minor in Math.

If the check valve fails, it will equalized to 30 psi OVER TIME, BUT with the instantaneous rush of air into the pump handle, it will fly up and hit you in the face, neck or eye!!! or worst .. BALLS.

Have mythbuster done this yet? This should be a good episode.
You should have taken a details class, the reason retarded explanations make sense is always because there's some detail left out.

You know the saying: If all else fails....dazzle them with BullS***

46. the guy at autozone is correct on the weight if you are planning on lifting the car off the ground before pumping it up with the bike pump.

47. I bet the opposite thread exists in a car forum somewhere and all the users are saying the bike guy is a dumbass idiot.
Originally Posted by francois
i know my schit

fc
Nice, the third one is even a Subaru! I really don't see why people get chit for doing it.
Tire needs air + you have a bike pump = inflated tire.

48. This thread brings the "Performance Video" back.....

"Pumping my tires and lubing my chain"

anybody?

49. For the record, if you pump up to 35psi, you probably are a dumchit. I'd stop at 20 or 25 and roll to a gas station for an air compressor. (unless you are stuck at trailhead or somewhere far)

next question, how many 16g CO2 cartridges would it take?

Also thinking about the next Downieville gathering

50. Originally Posted by grrrah
For the record, if you pump up to 35psi, you probably are a dumchit. I'd stop at 20 or 25 and roll to a gas station for an air compressor. (unless you are stuck at trailhead or somewhere far)

next question, how many 16g CO2 cartridges would it take?

Also thinking about the next Downieville gathering
That's the new Downieville Gathering contest:
- pump a car tire from 0 to 35 psi
- every minute that passes, drink a BEER!

fc

51. This what you need right here. \$13.

http://www.homedepot.com/webapp/wcs/...ocStoreNum=630

Or you can have my friend pump up your car tire.

fc

52. Originally Posted by Neela
Okay guys, I'm having a huge debate with a guy at autozone...
Please let me know what autozone I would love to talk to this clown!

54. ## Or...

Originally Posted by RidinginSF
Did the guy at Autozone know which aisle the blinker fluid is? I've been told that since my truck is 19 years old, it needs a topping off...
Go ask him for 12 feet of centerline, or spark plugs for your diesel.

55. Originally Posted by francois
That's the new Downieville Gathering contest:
- pump a car tire from 0 to 35 psi
- every minute that passes, drink a BEER!

fc
Adding 4lbs to my wife's car the other day, I can tell you even with a nice (ish) Specialized floor pump it would have taken about 2 or 3 beers to get those 4 pounds in. 0-35 would be brutal. I'd be in.

Q

56. It's not that hard, folks.

Bunch of office workers

57. i don't know about all this math stuff, but i have used a bike floor pump on a car tire and i'm still here to tell about it. it took FOREVER to pump enough volume in the car tire to be worthwhile. HTH

58. OMG funny a\$\$ thread here this ones a laugher.If you've done it you'll just laugh at this thread;-) did a truck tire once to about 20 psi it took F O R E V E R like 2 hours I was sore for days...

59. The PSI would change (a bit) due to compressing the tire by the car weight, thus reducing the volume of the tire. However like you pointed most of the tires uses high enough pressure so the tire deformation is minimal.
To prove that theory is fine and pressure indeed changes, inflate the tire slightly and then apply the car weight. Since deformation would be more pronounced therefor a volume change, the PSI change can be registered.

BTW, back when I was kid, neighbor auto-enthusiasts (you had to be one in Russia to own a car at that time) mostly used hand floor pumps and changed their tires with hammer and set of pliers. No one died from it

60. Originally Posted by francois
Btw, it is illegal to charge for compressed air in CA gas stations. So although the tire pump machines ask for 2 quarters, you can go inside and ask the attendant for tokens for the tire pump.
I think it's only true if you're a paying customer, but they'll always turn it on for you, in my experience.

61. I think you're leaving out the fact that a shraeder valve is a one-way valve, AKA a check valve.

Morgan

62. True story... I had a slow leak on my tire and was too lazy to go get it fixxed, so every morning for two weeks I had to pump my tire up with my bike pump. I had it down to a science, Specialized floor pump starting from around 0-5 psi I would get it to 30-35 psi with 120 pumps... It became a challenge to see how many pumps I could do before having to rest... In the begining it was around 35-40... By the end of two weeks I could go non stop.... Woot woot.

Chris

63. Originally Posted by francois
That's the new Downieville Gathering contest:
- pump a car tire from 0 to 35 psi
- every minute that passes, drink a BEER!

fc
Redneck style:

Morgan

64. Originally Posted by Fast Eddy
I think it's only true if you're a paying customer, but they'll always turn it on for you, in my experience.
Correct. 13651

fc

65. Originally Posted by WaitWienie
True story... I had a slow leak on my tire and was too lazy to go get it fixxed, so every morning for two weeks I had to pump my tire up with my bike pump. I had it down to a science, Specialized floor pump starting from around 0-5 psi I would get it to 30-35 psi with 120 pumps... It became a challenge to see how many pumps I could do before having to rest... In the begining it was around 35-40... By the end of two weeks I could go non stop.... Woot woot.

Chris
Ha!!!!

Don't do that again. You don't want your upper body that big. Bad for your cycling career.

fc

66. This thread is too funny. Youngsters nowadays all have compressors at their disposal. I pumped up plenty of car tires with a floor pump when I was a kid. I think my Dad thought that was my main use back then. 'Course back then tires were 13", 14" and 15". My family drove cheap Japanese/Euro econo-boxes so I only had to pump up the 13" tires.

67. Originally Posted by francois
Ha!!!!

Don't do that again. You don't want your upper body that big. Bad for your cycling career.

fc
Don't worry I was building " lean " muscle.... lol High reps low weight!!! lol

Chris

68. I use a bike pump to pump up the tires on both my cars. I don't have an air compressor and those electric ones that plug into the car's 12V outlet are probably just as slow as pumping with a good floor pump.

To make seating tubeless bike tires and filling car tires easy, this is the pump to get (the Topeak JoeBlow Mountain):

69. didn't read most of the thread, but yes, the guy at autozone is a complete dumbass.

Having pumped up my cars tires with a bicycle pump in a pinch, I can recommend a couple things - first, if at all possible, try and avoid it at all costs. It takes forever and a half. second, let the pump cool every once in awhile, I melted through pretty much every moving seal in the pump shaft. Also, use liberal amounts of grease to keep things smooth.

70. i top off my 205/55/16 tires about once every 2 months, and it takes about 8-10 pumps with joeblow floor pump for one psi. after checking all four tires, the pump does get warm as william42 said. i'm not sure the pump, or your arms, would hold up to 300+ pumps if you're starting from zero.

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