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  1. #1
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    29er vs 700c tire

    Ok, maybe I'm the stupid one.

    I recently bought a 29er about a month ago from Performance bikes after about 17 years of doing nothing. I'm thinking about getting a set of road tires, until I'm ready to hit the trails.

    I told the sales guy I was looking into getting a set of 700x35 for my 29er. the current tires are 29x2.1. he told me that 700c and 29inch rims are entirely two different sizes and that there is no way I can fit a 700c tire on my 29er rim. he sure made me feel stupid, and i felt emabarrassed.

    I always thought that 29er and 700c rims had identical circumference. I figured mounting a skinny 700c on my MTB rim may not be possible or if it is, not advisable. but I was looking for a fat-ish 700c tire, which shouldn't be an issue.

  2. #2
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    No problem at all. Get a pair of those 700x35 tires, mount them in your "29er" rims and show them to the sales guy. Bring a camera and take a picture of his face. As long as the 700 tire is wider than your rim (and a 35 mm tire should be) you won´t have any problem.

  3. #3
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    Quote Originally Posted by raposu
    No problem at all. Get a pair of those 700x35 tires, mount them in your "29er" rims and show them to the sales guy. Bring a camera and take a picture of his face. As long as the 700 tire is wider than your rim (and a 35 mm tire should be) you won´t have any problem.

    thanks, I'm ordering some tomorrow...I just lost confidence in the guys at Performance Bikes.

  4. #4
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    Second that. My 700c x 35 street tires mount up perfectly fine on my WTB Dual Duty 29er rims, and these are now my dedicated street wheels. (I roll on a set of Salsa Semi 29er wheels on the dirt.)

  5. #5
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    I run the schwalbe big apples and reccomend them highly.

    When you do confront the bike shop muppet, please make sure his collegues are standing near by and remind him how stupid he made you feel.

  6. #6
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    You actually had confidence in the guys working at Performance Bike?

  7. #7
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    700c rims are 622 mm in diameter. 29er rims are 62.2 cm.

    Seriously, everyone else is quite correct. You can run 700c road tires on your rims. Don't get the really super skinny ones like on a racing bike, but you should be able to run 35mm tires without trouble. I have some 38mm tires that I run occasionally.

    The issue with skinny racing tires on a 29er bike is that at some point as you get narrower and narrower on your tire, you need to also get a narrower rim. For example, the rims on my Hifi are 28mm wide. I wouldn't try mounting a 23mm tire onto a 28mm wide rim. I could probably mount it, but I prefer my tires to be wider than my rims.

    Watch for the ISO numbers on tires. 622 is the magic number for 29er and 700c. 559 is the magic number for 26-inch tires on current-model 26ers.

  8. #8
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    Hope Performance Bikes good place to save money

    If you want advice Performance is hit or miss, I'd recommend a local privately owned bike shop for advice or a good bike mechanic. The Prices of tubes, tires and Do Dads are really good at Performance and at REI. The LBS is usually more expensive but a better place for atmosphere and Guidence.
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  9. #9
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    Even on my Kenda Nevegal 29 x 2.2 has a marking beside it that says 700 x 55

  10. #10
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    I just mounted a couple 38c interwolfs on my salsa la cruz's 29er rims. It's most definitely possible... I had 31c tires on beforehand.

    I hate it when bike shop employees know less than the average biker then proceed to make the average biker think they're stupid. My buddy would be riding a hybrid by now had he taken the last horrible advice I heard... supposedly these fancy hybrids are superior to mountain bikes in almost every way. There are some great shops and some horrible ones.

  11. #11
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    Guy at REI tried telling me the same thing. I laughed heartily at him and went outside, brought in my bike, and educated him.
    Oh noes. I'm going to drink the Kool-Aid.

  12. #12
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    Hope Don't worry about Performance or REI You got Us

    Not only can you run 700c road tires on your 29er, you can build some kooky disc brake wheels with way light 700c Carbon fiber road rims. You own an extremely versatile machine OP. You could run sew up rims if you wanted to. Cyclocross tires on the stock rims sound like a great idea. Oh did REI go you to become a member, Perfomance did with me but it was free.
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  13. #13
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    You should have laughed in his face and called him an idiot. Some kid did that to me once, he tried to make me feel like an idiot when I asked "Where are your biggest presta valve 700C tubes?" He asked me what it was for and I told him my 29er and he proceeded to tell me that they don't carry 29er tubes and 700C was totally the wrong size." "700C and 29ers are like two inches different in diameter." he said.

    One of the service guys saw that I was getting really annoyed and frustrated by this kid and asked "what is he looking for?" To which the kid replies, "29er tubes, you know, the ones we don't have." The service guy said "yes we do, those 700x48 tubes on the shelf in back are for 29ers. 29er wheels are just wider 700C wheels. Same diameter as a road bike. We should be getting some bigger tubes in soon." The kid looked like he had seen a ghost.

    Bike store kids are dumb. I remember the time I was looking for tubeless strips and valves for my "Tubeless ready" Bontrager wheels and the kid tried to tell me I had everything I needed already.

  14. #14
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    Performance is a bit misleading by name. I am not sure what they are alluding to when referring to "performance". Yep...good for deals on small stuff. I don't recommend asking them too many questions....

    Kind of like Home Depot. Good for deals...not for advice.

  15. #15
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    Quote Originally Posted by GTR-33
    You should have laughed in his face and called him an idiot. Some kid did that to me once, he tried to make me feel like an idiot when I asked "Where are your biggest presta valve 700C tubes?" He asked me what it was for and I told him my 29er and he proceeded to tell me that they don't carry 29er tubes and 700C was totally the wrong size." "700C and 29ers are like two inches different in diameter." he said.

    One of the service guys saw that I was getting really annoyed and frustrated by this kid and asked "what is he looking for?" To which the kid replies, "29er tubes, you know, the ones we don't have." The service guy said "yes we do, those 700x48 tubes on the shelf in back are for 29ers. 29er wheels are just wider 700C wheels. Same diameter as a road bike. We should be getting some bigger tubes in soon." The kid looked like he had seen a ghost.

    Bike store kids are dumb. I remember the time I was looking for tubeless strips and valves for my "Tubeless ready" Bontrager wheels and the kid tried to tell me I had everything I needed already.
    must be nice to know everything.

  16. #16
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    Thanks for the comments guys. Next time, I'll avoid asking those guys at Performance for their opinions. They just happen to be close to my home and have stuff in stock, so I make a lot of quick stops there.

    Anyways, I ordered 2 Schwalbe Delta Cruiser in Cream (700cx35). They were cheap ($20/piece). Hope to get them soon.

    Thanks again folks.

  17. #17
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    To the OP, that "tech rep" is an a$$, when you get your "700C" non 29er tyres take your bike back in and show him that they actually fit

    GTR-33, the kid was actually right, but he didn't know about which diameter he was speaking - Rims are the same diameter, BUT, a 700c road tyre is roughly 2" smaller in OUTER diameter than a 29er tyre.

    Quote Originally Posted by GTR-33
    You should have laughed in his face and called him an idiot. Some kid did that to me once, he tried to make me feel like an idiot when I asked "Where are your biggest presta valve 700C tubes?" He asked me what it was for and I told him my 29er and he proceeded to tell me that they don't carry 29er tubes and 700C was totally the wrong size." "700C and 29ers are like two inches different in diameter." he said.

    ..........................................yada.... .......................
    Last edited by LyNx; 10-30-2009 at 05:10 AM.
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  18. #18
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    Yeah, you probably dont want to run road racing tires on your 29er rims, but touring/city tires work great.

    I have Panaracer T-Servs mounted up to my Dual Dutys on my Cyclocross bike (which is my road bike). They are the biggest tires that fit under fenders. For my Karate Monkey ... the Schwalbe Big Apple!!!!

  19. #19
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    Here's one for the rep- Do 26" tubes fit 29er wheels?

  20. #20
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    Quote Originally Posted by newaccount
    Here's one for the rep- Do 26" tubes fit 29er wheels?
    yes sir. That's the only kind I run. Matching the cross sectional size of the tube (such as 2.1") is more important than the diameter. That said, they are a little trickier to install because you have to stretch them over the rim. Some people get easily frustrated by that

  21. #21
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    Yea, I don't mind doing the extra work at home, but for the trail, I carry a full sized spare.

  22. #22
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    Here is a picture of 700x38 tires mounted on Salsa Delgado 29er wheels.
    Attached Thumbnails Attached Thumbnails 29er vs 700c tire-surly-small-.jpg  


  23. #23
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    Went to performance today on my lunch break to pick up some street tires for my 29er.

    I was 90% sure a 700c tire would fit my 29 rim.....but asked an employee to be 100%sure. The employee told me that 700c was a 28 inch rim and that I should check performance online for 29er road tires.

    I should have checked out this forum first. Thanks for clearing this up guys.

  24. #24
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    The kid clearly didn't know what he was talking about (they did, in fact, have tubes that would work), and your trying to split hairs to skewer GTR ain't right either. Read what you made bold in the quote.
    29er tires are 700c. You're the one who added "road."
    Anything to jump someone's case, it seems.

    Quote Originally Posted by LyNx
    To the OP, that "tech rep" is an a$$, when you get your "700C" non 29er tyres take your bike back in and show him that they actually fit

    GTR-33, the kid was actually right, but he didn't know about which diameter he was speaking - Rims are the same diameter, BUT, a 700c road tyre is roughly 2" smaller in diameter than a 29er tyre.

  25. #25
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    NO, was just pointing out that some only read/hear stuff and the fact that the OUTER diameter might be what he heard is what lead him to beleuve that 29er/700C are differnt sizes. I forgot to add outer it seems to totally clear the statement up, but from earlier parts of my post I figured it was "reconized". I've adjusted it, so as to be totally acurate.

    Quote Originally Posted by meltingfeather
    The kid clearly didn't know what he was talking about (they did, in fact, have tubes that would work), and your trying to split hairs to skewer GTR ain't right either. Read what you made bold in the quote.
    29er tires are 700c. You're the one who added "road."
    Anything to jump someone's case, it seems.
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  26. #26
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    Quote Originally Posted by LyNx
    NO, was just pointing out that some only read/hear stuff and the fact that the OUTER diameter might be what he heard is what lead him to beleuve that 29er/700C are differnt sizes. I forgot to add outer it seems to totally clear the statement up, but from earlier parts of my post I figured it was "reconized". I've adjusted it, so as to be totally acurate.
    Gotcha, but I still think you're splitting hairs. Bottom line: when the kid said, "that they don't carry 29er tubes and 700C was totally the wrong size" he was dead wrong on both counts. The diameter of the tube is much less important that the width (the reason why you can easily use 26" tubes in 29er tires, which he also clearly didn't understand. If you want to believe that he was "right" or knew what he was talking about by twisting his words to mean something they didn't, I ain't gonna to stop you.

  27. #27
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    Never said the kid was right, only that he might have been wrongly mis-informed and quoted/told the OD instead of the ID.

    Quote Originally Posted by meltingfeather
    Gotcha, but I still think you're splitting hairs. Bottom line: when the kid said, "that they don't carry 29er tubes and 700C was totally the wrong size" he was dead wrong on both counts. The diameter of the tube is much less important that the width (the reason why you can easily use 26" tubes in 29er tires, which he also clearly didn't understand. If you want to believe that he was "right" or knew what he was talking about by twisting his words to mean something they didn't, I ain't gonna to stop you.
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  29. #29
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    Good thread info. In a pinch to get home, I threw a butyl 700x35 tube into a 2.25 Racing Ralph 29er tire and mounted to a 24mm wide Velocity rim. It was because the shop didn't have a 48mm presta valved 29er tube in stock. The recommendation for the tube to be rated at least as wide as the rim is a good one (700 x 23 wouldn't work).
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  30. #30
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    Quote Originally Posted by rydbyk View Post
    Performance is a bit misleading by name. I am not sure what they are alluding to when referring to "performance". Yep...good for deals on small stuff. I don't recommend asking them too many questions....

    Kind of like Home Depot. Good for deals...not for advice.
    Gotta love the way one experience with one employee is tossed around as a problem within a whole organization. The best tech in my town works in an REI. Not just my opinion. We regularly ride with a local shop owner and the joke among us is that he is the only person who doesn't have his bike serviced at REI. One kid's knowledge base does not mean that Performance or REI can't hire competent employees.
    Yeah well, that's just, ya' know, like, your opinion, man.

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  31. #31
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    Quote Originally Posted by raposu View Post
    No problem at all. Get a pair of those 700x35 tires, mount them in your "29er" rims and show them to the sales guy. Bring a camera and take a picture of his face. As long as the 700 tire is wider than your rim (and a 35 mm tire should be) you won´t have any problem.
    I have WTB LaserDisk Trail 29inch . (Depth 18 mm width 21mm) Does this mean I can fit 700x23 or 700x25 ?

    My bike guy told me to go at least 700x32 or tyre will pop out from the rim.

  32. #32
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    700x38

    Crossroads Armadillo Elites mounted on my Kona:


  33. #33
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    Quote Originally Posted by totto View Post
    I have WTB LaserDisk Trail 29inch . (Depth 18 mm width 21mm) Does this mean I can fit 700x23 or 700x25 ?

    My bike guy told me to go at least 700x32 or tyre will pop out from the rim.
    The 21mm is the inside width. The tire should be wider than the rim's outside width which is ~27mm
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  34. #34
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    Quote Originally Posted by totto View Post
    I have WTB LaserDisk Trail 29inch . (Depth 18 mm width 21mm) Does this mean I can fit 700x23 or 700x25 ?

    My bike guy told me to go at least 700x32 or tyre will pop out from the rim.
    I call WTB about that rim and they stated that the rim should be fitted with a tire of at least 35mm.

  35. #35
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    Nice to find this thread. I was in the store and then on the phone with Performance and got wrong and inconsistent information from both. The worst part is that I zoomed in on a picture of the tires the phone rep told me to buy and they clearly say 26" on them, even though they are in the "road bike tire" section. Now I am just asking for 700x35 and getting somewhere.

  36. #36
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    Update

    Quote Originally Posted by jseko View Post
    I call WTB about that rim and they stated that the rim should be fitted with a tire of at least 35mm.
    -- reporting back. --
    35mm working fine. Thaks heaps jseko.
    Also got myself 58 x 622 ( 29 x 2.35 ) and fits fine.
    Will ride on it this wkend & report back

  37. #37
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    Quote Originally Posted by jcaino View Post
    Guy at REI tried telling me the same thing. I laughed heartily at him and went outside, brought in my bike, and educated him.
    I actually did the same on my wife's hybrid. She was running 700x32 and we put on 700x23 slicks to improve her speed and efficiency, the LBS guy was all 'that wont work evar!' so I swapped tires right there in the shop and aired it up without issue. Specs (for the most part) exist for a reason.

  38. #38
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    Quote Originally Posted by RCook View Post
    I actually did the same on my wife's hybrid. She was running 700x32 and we put on 700x23 slicks to improve her speed and efficiency, the LBS guy was all 'that wont work evar!' so I swapped tires right there in the shop and aired it up without issue. Specs (for the most part) exist for a reason.
    How does she like the new bumpy ride?

  39. #39
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    Awesome thread here. I thought about doing the same when I first got my Rockhopper, and was told the same by the LBS employee. I went to another store for another opinion, and was told the only way was to lace a 700c rim to my existing hubs.

    This will make my commute a little easier, thanks!

  40. #40
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    Good thread. Just curious, what does the "C" in 700c stand for?

  41. #41
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    Quote Originally Posted by getagrip View Post
    Good thread. Just curious, what does the "C" in 700c stand for?
    Mr. Bike -- Tire sizes

    WHAT DOES TIRE SIZE "700 C" MEAN?

    February 19, 2005


    What does the “c” in 700c stand for? My first guess would be, of course, centimeter, but a wheel with a diameter of 700 centimeters would be nearly 23 feet across! Thanks.

    Chris S.

    Chris:
    The "C" formerly indicated the width of the tire. 700-size tires come in a variety of widths and "A" once meant the narrowest while "D" meant the widest. Nowadays, the letters more correctly indicate tire diameter, for reasons that remain obscure—tho not as obscure as what that "700" really means. Let me elaborate.
    As you’ve obviously seen, bike tires have printed on their sidewalls a sequence of two sets of characters separated by "x". The first set, usually a number, tells you the tire’s diameter (measured, allegedly, at the bead, the circular piece of metal or plastic embedded into the tire that holds it into the rim). The second set of characters indicates the tire’s width, sometimes followed by an extra letter at the end to indicate, uh, the true diameter (I swear I did not make this up).
    It turns out that a 700 C tire actually has a bead diameter of 622 millimeters. So why do they call it 700? For the same reason a 2-by-4 piece of wood has neither 2 nor 4 as its dimensions; it really measures 1.5 by 3.5 inches, but "2 by 4" rolls off the tongue better, and probably sells better too. To complicate matters, a tire labeled 700 B has a diameter of 635 mm and a 700 D tire has a diameter of 587 mm.
    This bit of subterfuge doesn’t, however, stop at 700-size tires. It seems that you can’t trust any of the inch diameters, either: A tire labeled 26" might actually come in at around 24 ¼ inches (it varies by type of tire, believe it or not), while a tire that claims 27" might measure roughly 24 ¾ inches.
    It gets worse. The second set of characters, the width measurement, doesn’t cause much trouble if it appears in millimeters, as in 700 x 32 (usually shown as 700 x 32 C, with the C, as I said before, indicating the true diameter—in this case, 622 mm).
    The mischief arises if the width appears in inches. It sometimes appears as a decimal, as in 26 x 1.75, and sometimes as a fraction, as in 26 x 1 ¾. You’d think that a 26 x 1.75 tire has the same size as a 26 x 1 ¾ tire. In reality, the first one has a slightly larger diameter.
    Fortunately, you won’t usually get thrown by this amusingly chaotic measurement "system" unless you want to replace your bike’s wheel or install a tire having a different width. In that case, look for another designation on your existing tire, a designation having two numbers separated by a hyphen—e.g., 32-622. This designation, established by the trusty European Tyre and Rim Technical Organisation (ETRTO), tells you, in millimeters, the width followed by the true diameter. Most new tires come with the ETRTO designation, so when replacing a tire or wheel you can ignore the "x" designation.
    By the way: Some call the ETRTO designation the ISO (International Standards Organization) designation. Don’t ask.
    Mr Bike

  42. #42
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    Kazkut's explanation is mostly correct.

    IIRC, all "700" size tires were meant to have the same (approximate) outside diameter.

    So if you wanted a wider tire to have the same OD as a narrower tire, you needed to decrease the bead seat diameter.

    Thus, 700A was the narrowest tire/largest BSD, and 700D was the widest tire/smallest BSD.

    As with most nonsensical things, we can blame the French for this system.

    Tire Sizing Systems

  43. #43
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    Quote Originally Posted by mobaar View Post
    Kazkut's explanation is mostly correct.

    IIRC, all "700" size tires were meant to have the same (approximate) outside diameter.

    So if you wanted a wider tire to have the same OD as a narrower tire, you needed to decrease the bead seat diameter.

    Thus, 700A was the narrowest tire/largest BSD, and 700D was the widest tire/smallest BSD.

    As with most nonsensical things, we can blame the French for this system.

    Tire Sizing Systems
    this
    Each variant of 700X in the French system had a different BSD.
    700c is the one that had a 622mm BSD.
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  44. #44
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    I run 700x40's for Cross races and gravel and washboard roads. They fit great.

  45. #45
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    Quote Originally Posted by JonathanGennick View Post
    700c rims are 622 mm in diameter. 29er rims are 62.2 cm.
    Well, there you go... They ARE different.

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    I'm so glad I stumbled onto this thread, i'm fairly new into changing parts and tires on my bike. I currently have a 29er and was wondering if these tires would fit on my rims? DURO 700x35c


    The seller contacted me and told me their was no way that those would fit on my bike. What are your opinions, I really have no clue when it comes to tire size and fitting.

  47. #47
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    29" = 700c = ISO 622mm BSD

    Seeing as all the other 700 sizes (A, B, D) are basically obsolete, you should be fine with that tire. The key is not going narrower than your rim. 700x35 should be fine unless you're running P35 or some other huge rim.

  48. #48
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    Quote Originally Posted by mobaar View Post
    29" = 700c = ISO 622mm BSD

    Seeing as all the other 700 sizes (A, B, D) are basically obsolete, you should be fine with that tire. The key is not going narrower than your rim. 700x35 should be fine unless you're running P35 or some other huge rim.
    Speaking of the Velocity P35 rim....what's the narrowest "700c" tires I should be comfortable with? I have 47's on there now and they fit awesome but with the extra rim width have become a tight fit on my frame. I'm thinking a 42 is as low as I'd ever want to go anyways, and that's probably the minimum for these rims. Been eyeing up some Nomad 45's from Resist to drop alot of tire weight, probably go that route next unless I opt for more dirt tread.
    Quote Originally Posted by Hesh to Steel
    With people liking mongoose and trek bikes now, what's next in this crazy world? People disliking the bottlerocket?!

  49. #49
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    Quote Originally Posted by Bulldog View Post
    Speaking of the Velocity P35 rim....what's the narrowest "700c" tires I should be comfortable with? I have 47's on there now and they fit awesome but with the extra rim width have become a tight fit on my frame. I'm thinking a 42 is as low as I'd ever want to go anyways, and that's probably the minimum for these rims. Been eyeing up some Nomad 45's from Resist to drop alot of tire weight, probably go that route next unless I opt for more dirt tread.
    I have used Kojak 35's on P35's without problem. I have mounted Ultremo 28's, which run big, just to see how they look and the sidewall still bulges outward. I never rode the Ultremos though. Ultremo 28's measure 31.5mm wide on a Crest and work well. They measure about 36mm on a P35. A 42 or even a 38 will work just fine on that rim.

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    Quote Originally Posted by craigsj View Post
    I have used Kojak 35's on P35's without problem. I have mounted Ultremo 28's, which run big, just to see how they look and the sidewall still bulges outward. I never rode the Ultremos though. Ultremo 28's measure 31.5mm wide on a Crest and work well. They measure about 36mm on a P35. A 42 or even a 38 will work just fine on that rim.
    Sweet, glad to hear it. Thanks. I've got some 35mm road slicks laying around that I thought would look like wrapping my rim in a rubber band, but I might throw them on for a look-see.
    Quote Originally Posted by Hesh to Steel
    With people liking mongoose and trek bikes now, what's next in this crazy world? People disliking the bottlerocket?!

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