When is a 29'er a 29'er?- Mtbr.com
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  1. #1
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    When is a 29'er a 29'er?

    At what width of tire, does the tire go from 28" to 29"? For example, we all discount 700x45C tires as 28" tires (although the Maxxis tires I have measure 28.5"), but a 700x52C is a 29" tire.

    btw, anyone know what Maxxis tires these are?
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  2. #2
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    The 29" name only started to be used when WTB made that first 29x2.1" nanoraptor, the first 700c tire with serious volume. It's at least 50% more volume than any 700x47c I've ever seen. Up to 47c has "always" existed till then, and only for a few people in Crested Butte, proved useful for MTB'ing. Crested Butte is also where 29inch's namegiver, Wes Williams, ran his 29" world campaign from. Before he did 28"ers, with tires typically named 45c.
    The consesus now seems to be that the very narrow 28x2.1" tires (both called 28" yes) Schwalbe Little Albert and Continental Capor, at some 46mm carcass, are allowed to call themselves 29". :-) I've not come accross anything narrower I think would qualify. My 28x2.0" Schwalbe Big Apple realy is 28" IMO, 43mm carcass on road rims. Nothing that would have rocked the world a few years ago.
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  3. #3
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    measure it

    This may be oversimplified, but take a tape and measure the diameter of the entire wheel, inflated on the rim. If it's 29" or real close to it, it's a 29er, baby. If it's under 28, then you can't really call it a 29"er, can you? Interesting, though, many 26ers are actually well over the mark. Do we call them 27's? Many in Norba and UCI preferred not to notice this, and stuck with their 26" rule for a long time!

  4. #4
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    For some reason 26" uses 22 1/2" rims, and 700c uses 25" rims.
    Klok - XC - Skate - Ski

  5. #5
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    A 29er is always a 29er. Paraphrasing Chalo Colina: 29er is not a tire size, it's a kind of bike. If all frames for 700c wheels could accept 700x60 tires, there would be no need to distinguish the category. Since most 700c bikes are crippled when it comes to tire clearance, however, the 29" designation serves to identify those that are not.

  6. #6
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    Quote Originally Posted by slim_pickens
    A 29er is always a 29er. Paraphrasing Chalo Colina: 29er is not a tire size, it's a kind of bike. If all frames for 700c wheels could accept 700x60 tires, there would be no need to distinguish the category. Since most 700c bikes are crippled when it comes to tire clearance, however, the 29" designation serves to identify those that are not.
    Yeah, just as all 26" bikes aren't all exactly 26" (a 26x1.0 slick can be 24.5" and a 26x3.0 can be 27.5"), 29" is a vague definition too. No "29 inch" tire/rim combo that I know of quite measures 29", they're more in the 28.5" range, but no matter. My vague definitions of tire "designations" that fit 622mm rims:

    road tires: 700x20 up to about 700x30 or so.
    cyclocross/hybrid tires: about 700x30 to 700x38.
    "28 inch" tires: bigger than will fit on a cyclocross bike, but not big enough to be considered true MTB tires: about 700x40 to 700x48 or so.
    "29 inch" tires: I only consider a tire a true 29 incher if it's got enough volume to genuinely qualify as a true MTB tire: in other words 700x48-50 on up. This excludes the 45mm MutanoRaptor and 42mm ZED, but includes most of the larger tires discussed on this board. I grudgingly accept the Conti Vapor into this category.

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