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  1. #1
    mtbr member
    Reputation: Brakebreaker101's Avatar
    Join Date
    Jan 2009

    Converting a 29 to 650b

    I recently got a 170mm fork from a friend. I was just curious about the new chromag stylus frame as a 29er. It's rated at a max of 140mm fork and is a a HT but if I ran 650b's, would I be able to put my 170mm fork on it? I know it isn't really designed for it and would most likely throw off the geometry, especially when the fork compressed more than the suggested 140mm. Just curious about what your opinions would be as I am not very experienced with messing around with travel and geometry.

    Thanks ,

  2. #2
    Reputation: Cotharyus's Avatar
    Join Date
    Jun 2012
    The problem might be more than just what the 170mm fork does with the geometry. In general, the hardest thing for manufacturers to get right when they started making 29ers was the geometry. In general, the geometry is fundamentally different for different tire sizes and different applications. You find, with your stock fork the bike is unridable and twitchy, while with the 170mm fork slacking the geometry up some, it's much better. I don't think the actual travel of the fork will be a problem, the stanchions start out longer to permit more travel, so clearance shouldn't be an issue. Unless you have a set of 27.5 wheels laying around you can test with though, it could be an expensive experiment that ultimately fails.

  3. #3
    mtbr member
    Join Date
    May 2013
    The smaller tire should give you an increase in effective head tube angle by 1* for less trail.

    It will also lower the front of the bike by about 3/4". This will of course all have to be balanced against the increase of length between your two forks.
    "Courage is being scared to death and saddling up anyway" John Wayne

  4. #4
    mtbr member
    Reputation: madsedan's Avatar
    Join Date
    Aug 2010
    It'll work for sure, but it'll feel like a long wheelbase bike, not very quick I'd guess.
    Hardrock 29er, Niner EMD9, Cannondale F29, Camber Expert, 650b Nickel all gone.
    2014 Giant Anthem 27.5 here.

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