Tire pressures for DH- Mtbr.com
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  1. #1
    Pain is a way of life
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    Tire pressures for DH

    I know there have been a few threads about this but I am stil unclear on how to setup tires / pressures properly. I ride a TR450 w/ Maxxis Minion 3C 2.5 DHF front and rear. I am about 250lbs geared up. The terrain I ride has a few step downs alot of berms and a good amount of very rocky technical stuff. I read some that say go around 40psi...But when I put in 40 psi the tire feels ridiculously hard. Don't see this being very good. I was running 20 - 22 psi before checking and it seemed low.


    Please help..any input would be appreciated.
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  2. #2
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    usually people run 28 to 32....for your weight I would run around 32 to 35.....You need the tire a little harder to not fold over in the turns

    to me 32 would be a good start
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  3. #3
    Capricious youth...
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    I run high pressure. 35-40. But that's just me. No one I know runs high pressure like that.
    Meh.

  4. #4
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    Yeah, only YOU can really set the pressure. SMT's 32psi starting recommendation sounds good.
    Increase if you pinch flat, or feel it squirming. Lower it if you don't like the grip.

  5. #5
    maker of trail
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    I'm 210lbs ish all geared up.

    I'll generally run a little under 25 in the front and a little more than 25 in the rear tire for general riding as a starting point.

    I'll change pressure depending on terrain.

    Basically "rules" I use..

    Increase if:
    - Hard smooth and fast (lower rolling resistance)
    - Choppy rough terrain where flats might be an issue.

    Lower if:
    - traction is more important, eg if its wet (chances are you'll be a bit slower too, so less susceptible to pinch flats)
    - If the terrain is soft to spread teh contact patch out and lower the rolling resistance.

  6. #6
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    Thanks guys......I think 40 is too much...Feels like a rock....I had 20-22 psi before but that was a bit too little i think......I will try 30 a go from there.

  7. #7
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    28 seems to be the ticket for me, too hard and I chatter all over doll heads at speed and blow corners (flatter loose and rocky).

    Rode the Luckypeak trail Tuesday and forgot I had 35 PSI from totting the grom around in his chariot towing his skuut and when I rode I was all over the place even the suspension soft had issues with it... Drop to 28 and like glue it holds a line amazing and the small chatter and jackhammering softens up. Suspension can only do so much the rest is up to tire pressure...

    Im 238 before Bfast and gear Id say try 28 and adjust a bit from there, I usually run hte front 1-2 PSI softer than the rear as well.
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  8. #8
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    wow makes me think my current pressures are completely off, 16psi rear 18 front, i like very low pressures, only way i can get enough grip on the off camber roots. (and i run very soft spring rates and low compression, 300lbs coil rear, soft and medium coil in my 888's with minimum compression)


    so what i mean from my little random moment there, is experiment and find what you like, no one person can the answer to stuff like tires pressures and suspension set-up, just give you a base to start from.
    Quote Originally Posted by [Orge
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    This problem could quite simply be solved if people would stop buying Konas.

  9. #9
    maker of trail
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    ^^^ Not really, in soft slippery conditions, I've run like 18 front 20 rear. Don't know why you'd run more pressure up front than the back though.

    Your weight also matters, as does your riding style, if you're smooth, you can get away with lower pressures than others...

  10. #10
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    Factors in tire pressure:

    Weight
    Riding Style
    Rim selection
    Tire SIZE selection
    Tire COMPOUND selection
    Tube selection (or lack thereof)
    Guage pressure accuracy
    Terrain
    Line selection

    I am sure I missed something....


    And this is why the user has to figure it out for himself. Guidance is good, but there are too many variables.

  11. #11
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    yeah those are my dry pressures, some times i run them harder in the wet, some times softer depends on the trail.

    oh and to put my input into perspective im 11stone (154lbs) im riding a 222 with 9 and quarter inches of rear travel, 8 inch up front and im far from smooth a lot of the time, plough quite a bit.
    Quote Originally Posted by [Orge
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    This problem could quite simply be solved if people would stop buying Konas.

  12. #12
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    Less air pressure = fewer air molecules = LIGHTER BIKE! weight weenies unite! haha

    I run ~25psi though, never use a gauge though, just go by feel. I can tell when riding whether I want more or less pressure and that is totally course dependent.

  13. #13
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    Agread with above poster!!!

    DH/FR casings will make a big difference as will the volume or diametr of the tire then weight and conditions.

    I run a larger profile and wether its DH or FR its 28 or withing a psi or 2 and thats the sweet spot for me. Any more it chatters and any less I roll hard on berms and G-outs.

    So yeah anyone who mentioned theres too many variables is right because then you can find 1 guy likes the wallowing and another likes the drifting and popping effect so it still continues...

    You know 40 is too hard go for 30 then adjust from there... A little less in front will assist in steering and hooking up as the rear is the load bearing tire so tad more to prevent wallowing... Soft compounds deflect less of objects giving a more damped feeling as well and a DH casing will allow less roll side to side with less pressure.
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  14. #14
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    I run 30psi front and 35psi rear in Minion DHF 2.5s and Maxxis Ultra Lite tubes. Im 180-185 in gear.

  15. #15
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    I weigh 150lbs and run 5.1D's

    2.5 Highroller ST front and rear

    32 psi
    Ground Steeze. @iggy_strbac

  16. #16
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    So normally I'm running right around 18-21 psi... is this too light then?
    The older I get, the faster I was.





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  17. #17
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    Quote Originally Posted by Full Trucker
    So I'm running right around 18-19 psi... is this too light then?
    depends.

    Are you pinch flatting or unhappy with the ride?

    No?

    You have your answer then.

  18. #18
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    Quote Originally Posted by CharacterZero
    depends.

    Are you pinch flatting or unhappy with the ride?

    No?

    You have your answer then.
    Dammit, stop ruining my trolling!
    The older I get, the faster I was.





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  19. #19
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    Quote Originally Posted by Full Trucker
    Dammit, stop ruining my trolling!
    HA.

    Frikkin' newb.

  20. #20
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    Quote Originally Posted by CharacterZero
    HA.

    Frikkin' newb.
    For the record: 18-21 depending on track and conditions is right for my setup. Schwalbe (Muddy Mary, Wicked Will, or Big Betty) usually 2.5 F & R on a Yeti 303R-DH. 195 butt nekkid. Anything under 16 psi for these tires is a bit low, but over 22 is worse. STUPID low pressures on the Schwalbes!
    The older I get, the faster I was.





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  21. #21
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    sorry to bring back a thread from a few months back. but im having some of the same issues. I just got the bike about a month ago, since then if blown the rear tire twice first was an actual puncture the second was @ blue mountain in pa. i was running about 34psi in the front and 32psi in the rear. im runnin maxxis minion 2.5 DHF i believe the 60a tires and all day the back was just feeling sloppy not staying true just being a bear to handle. it kept wanting to wash out on the berm's and just sorta do its onw thing, i pinch flatted the rear. but any way do i want to add more air? the tires are in great shape i weight about 210 geared up the springs on the bike are a little soft for me but i just cant seem to find a happy medium with tire pressures
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  22. #22
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    Quote Originally Posted by KrazyKessler
    sorry to bring back a thread from a few months back. but im having some of the same issues. I just got the bike about a month ago, since then if blown the rear tire twice first was an actual puncture the second was @ blue mountain in pa. i was running about 34psi in the front and 32psi in the rear. im runnin maxxis minion 2.5 DHF i believe the 60a tires and all day the back was just feeling sloppy not staying true just being a bear to handle. it kept wanting to wash out on the berm's and just sorta do its onw thing, i pinch flatted the rear. but any way do i want to add more air? the tires are in great shape i weight about 210 geared up the springs on the bike are a little soft for me but i just cant seem to find a happy medium with tire pressures
    kinda hurt my head reading that...

    but definitely up the pressure. 210lb rider and 32psi is kinda low.

    tire pressure is personal preference and only trial and error will help you find the medium.

  23. #23
    ~Disc~Golf~
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    I find a negative pressure helps me stick to the ground - good for railing corners - not so much for getting sky-high tho
    oh well
    Honestly... ahh I give up

  24. #24
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    yeah it was a mumbled bunch of thoughts i had my blind uncle blabbing in my ear and wouldnt shut up so i could type. i bumped the air pressure up to about 45 now i wanna see where that puts me so far its seeming well.
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  25. #25
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    45 psi is too high (assuming you have Minions with downhill casings). I'm 225 lbs and when I run a small rear tire (Kenda 2.35 or Maxxis 2.5), I run 35-40 psi. When I run bigger tires (Kenda 2.5, Maxxis 2.7, Michelin 2.6/2.8), I go 32-35 psi. Been doing that for the past 8 years at Whistler with great success, recommended to me by a World Cup DH mechanic.

  26. #26
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    Anywhere between 26-32 for me (and always few more in the back than in the front as a general rule), typically somewhere in that range I'll be happy, depending on where/what I'm riding and how. I hate pinchflatting, especially when shuttling and you know your buddies are waiting, so on rocky DH days I bump it up a bit, just to be safe.

  27. #27
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    holy crap i run like 35-45 psi and im only 80 lbs, if i run any lower than that i get flats
    btw i ride a hardtail if that makes a difference

  28. #28
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    None of these numbers mean jack shyt if nobody has a verified guage, bike pump guages are nearly ALL POS. Every bike pump guage I have used has been 5-10 PSI off.

    I have a verified accurate motorcycle tire guage that I use to compare my bike pump guages, put a piece of tape on em and write down how much the pump is off by on it.

    So somebody who tells you they run 18PSI probably has a guage that is way off.

  29. #29
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    Quote Originally Posted by blades-noob
    holy crap i run like 35-45 psi and im only 80 lbs, if i run any lower than that i get flats
    btw i ride a hardtail if that makes a difference
    as long as it works for you.

    everyones number will be different because of 1) the gauge they are using 2) different tube size/thickness 3) or different tire size.

    aslong as you keep things consistant, you should be able to dial in your psi easily

  30. #30
    wuss
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    Just remember that pumps don't usually have very good pressure gauges. A lot of people I know have actually swapped the default gauges to better ones to get more accurate readings, and the difference has occasionally been big.

    I just got a new Lezyne floor pump. I was wondering why it felt like my Rubber Queens where folding over while I have wide enough rims (Flow) and the same pressure (or even more) that people where recommending. I got a bad dent in my rim on a place I should not have gotten it...

    With the Lezyne's gauge I noticed that my >2 bar pressure was in reality about 0.8 bar... Maybe because I had gotten quite a lot of stans in the pump at one point.

    Anyway, as many have mentioned feeling is the main thing to go with, and occasionally trying somebody elses pump might not be a bad idea.

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