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  1. #1
    Older than dirt CCrew's Avatar
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    29'er wheel question - Be gentle here :)

    I'll admit, I'm a n00b to 29'ers, so be gentle here. Not even trying to do this, it's more a FYI question.

    Just bought a Gary Fisher Kaitai ( http://www.fisherbikes.com/bike/model/kaitai ) last week to use as a commuter, and I know it's essentially a 29'er frame, and certainly has the clearance for a lot more tire than the 700c x 38 WTB' Interwolfs it has on it. I'm actually looking to knock the 38's down to 35's or 32's to decrease rolling resistance even more, since it primarily sees just pavement duty. I have a hardtail MTB for the harder stuff and a Lemond for when I feel loke playing arrogant roadie snob.

    Question that I have regards the wheels.. 700c's use a 622mm rim, but it appears that the 29'ers do also. Are they essentially the same rims and the nomenclature comes from the overall tire sizing?

    Only reason I ask is that I like the option to put a real fork on the Kaitai and larger tires and I have a "true" 29'er should I decide at a later date not to use it for commuting duty.

    Thanks!
    Roger

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    29er rims are beafier and usually wider and therefore have diff tire fitments, so like you couldn't put a 700x23 on a 29er rim but you could put a 700x35 or somthin reverse is also true if you have a race road rim you couldn't put a 29x2.2 but if you could find like a 29x1.25 it would fit, its pretty cool.

  3. #3
    Older than dirt CCrew's Avatar
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    Quote Originally Posted by sirtigersalot View Post
    29er rims are beafier and usually wider and therefore have diff tire fitments, so like you couldn't put a 700x23 on a 29er rim but you could put a 700x35 or somthin reverse is also true if you have a race road rim you couldn't put a 29x2.2 but if you could find like a 29x1.25 it would fit, its pretty cool.

    Actually, the bike has Bontrager Rangers on it, which are the same (construction, not diameter) wheels as my 26" MTB, and also the same as the low end 29'er's that Gary Fisher sells, so they're MTB rims. It's more a question of whether the diameters are actually the same. Rim widths between the 26" and the ones I have on the Kaitai are also the same, and the 26" has 2.1's on it, so assumption on the width is they'll fit,, I have been known to be wrong tho

    Thanks for the response!
    Roger

  4. #4
    Custom User never's Avatar
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    Quote Originally Posted by CCrew View Post
    Are they essentially the same rims and the nomenclature comes from the overall tire sizing?
    Yep!

  5. #5
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    Nice bike.

    In my opinion, don't bother switching from 38x700s to 32x700s, i was following the same train of thought you were (skinnier wheels = less rolling resistance) and i switched from 37x700 continental countrysides to 32x700 specialized boroughs on my commuter but I've found that pedaling effort is about equal, and if it is any better I can't really notice it. It's probably not worth tossing aside your sets of 38's. I say ride em out and replace when worn.

    As for the 29er part of your question. As aforementioned 29er rims use 622mm rims but are generally thicker. I tried mounting my 29er tires on my commuter (kona dr.dew) for fun but there was not enough clearance between my chainstays to handle the 29x2.3" tires. The rims on my kona are also quite a bit skinnier than my 29er as well (19mm vs 27mm). I don't know how thick your rims are but You may have some trouble mounting some of the wider 29er tires. So keep that in mind. Hope that helps.

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    Years ago on a previous bike I switched wheels and went from 38 mm tires to 25. It made a huge difference both in acceleration and speed. Not all of it is due to rolling resistance. A particular program I found on the web indicated that I also reduced the frontal area by about a square foot. That's a lot at say 18 to 20 mph.

    Al

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    Quote Originally Posted by Fluxlo View Post
    Nice bike.

    In my opinion, don't bother switching from 38x700s to 32x700s, i was following the same train of thought you were (skinnier wheels = less rolling resistance) and i switched from 37x700 continental countrysides to 32x700 specialized boroughs on my commuter but I've found that pedaling effort is about equal, and if it is any better I can't really notice it. It's probably not worth tossing aside your sets of 38's. I say ride em out and replace when worn.
    .
    when i was first getting into road biking I origonally had 700x28mm conti gaterskin (kevlar tire, not folding so heavy for a road bike) i then switched out to 700x23 hutchinson fusion tire (210g race tire) and i noticed a speed increase, so I would expect going from a 38-32 to make a diff, of course tread pattern and compound will also be a factor, but w/e to eash his own

  8. #8
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    Quote Originally Posted by alcanoe View Post
    Years ago on a previous bike I switched wheels and went from 38 mm tires to 25. It made a huge difference both in acceleration and speed. Not all of it is due to rolling resistance. A particular program I found on the web indicated that I also reduced the frontal area by about a square foot. That's a lot at say 18 to 20 mph.

    Al

    You're right, there will be a performance increase with a smaller contact patch but dropping 5mm isn't going to do much as dropping 13mm. I also shed about a pound from my bike weight when i switched over tires but the performance difference would not have been enough to warrant my change if i wasn't replacing a pair of worn down seriously punctured tires.

    This is a commuter bike, roads aren't always in great condition (dirt, debris, pot holes, 2" drywall screws - though no fat tire will save you from this, etc.) so a fatter tire will help with ride comfort and control while sacrificing a couple mph from your average speed.

    It's a trade off either way. I don't know how the roads and traffic are in the OP's city, hopefully he'll make a decision that's right for him

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