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  1. #1
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    29-26" Trex T900

    Hi all,

    I have a used Trek T900. My 8-year-old daughter and I ride it mostly on the local gravel and paved bike-paths. Every once in a while we ride a little single-track.

    The bike came with 26" wheels/tires.

    I'm interested in 29" wheels for a smoother ride, and I'd prefer big hydraulic disc brakes to the rim brakes.

    A 29" wheel/tire is impossible in the rear, obviously, and I'm not ambitous enough to add a caliper mount in the rear, either.

    On the other hand, it occurs to me that I could easily replace the front fork with a disc brake-ready rigid 29" fork. Then I'd just need a wheel/tire and a front brake.

    I understand that it would slightly change the geometry, but that seems insignificant.

    Thoughts?!

  2. #2
    Nigel nfmisso's Avatar
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    If you are going with the same width tires; you are looking at changing the angles by about 1 - yes small, but maybe noticeable. On a single, a similar change would result in angle changes in the 2 range which is large.

    In USA, this is about a $250- experiment assuming that you have to purchase a fork and a wheel; add more for the disc brake.
    Nigel
    Mechanical Design Engineer

  3. #3
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    650B is another option. One of our tandems came with 26" wheels and MTB tires on it and we put road tires on it, but my wife (who captains it with one of the kids) doesn't like the reduced ground clearance. I did some measurements and concluded that a 650B rim would work with the brakes in their current positions (with some reduction in leverage). I ultimately abandoned the idea because it's an inexpensive tandem and there aren't many appropriately inexpensive 650B wheel options out there. I think we're going to just make the bike work for another year and spend some real money on a new tandem next year.

  4. #4
    Senior Member waynesulak's Avatar
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    Quote Originally Posted by nfmisso View Post
    If you are going with the same width tires; you are looking at changing the angles by about 1 - yes small, but maybe noticeable. On a single, a similar change would result in angle changes in the 2 range which is large.

    In USA, this is about a $250- experiment assuming that you have to purchase a fork and a wheel; add more for the disc brake.
    Assuming the 1 degree head tube angle is correct then for me that would be a large difference in handling unless the new fork was designed with more rake than the original. To me the difference in a 73 HT angle and 72 HT angle with soimiliar forks is a large one.

    Perhaps upgrading the tires is a cheaper option to explore first.

    Compass Bicycles: 26" Tires

  5. #5
    Nigel nfmisso's Avatar
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    Quote Originally Posted by waynesulak View Post
    ......

    Perhaps upgrading the tires is a cheaper option to explore first.

    Compass Bicycles: 26" Tires
    Hi Wayne;

    Any idea what the pressure recommendations are for the Compass 26" tires that you recommended? I could not find any recommendation on the website, and thought that I'd ask here first.

    Thank you
    Nigel
    Mechanical Design Engineer

  6. #6
    Senior Member waynesulak's Avatar
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    I am not sure. I use Compass 650B tires on our tandem which I think has the same casing rated at 75 psi. We run 70-80. Compass will respond to emails so I suggest you check with them.

  7. #7
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    Quote Originally Posted by qspencer View Post
    650B is another option.
    I would have the same problem... 650B isn't any cheaper than 29er. I think a 650B would fit in the rear, but it would be really close, depending on the tire. The City Drifters on there now are only 26x1.5, and there's only 1/2"-3/4" clearance.


    Quote Originally Posted by waynesulak View Post
    Assuming the 1 degree head tube angle is correct then for me that would be a large difference in handling unless the new fork was designed with more rake than the original. To me the difference in a 73 HT angle and 72 HT angle with soimiliar forks is a large one.

    Perhaps upgrading the tires is a cheaper option to explore first.
    I'm not so worried about slowing down the head tube angle. Having the front of the bike high for me and the rear low for my daughter would be OK, too.

    Of course I'll get new tires first (though the City Drifters seem to last forever), but those Compas tires aren't knobby enough. I'm looking at Schwalbe Smart Sam Pluses...

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