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  1. #1
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    KM w/ 650b out back, 29er front....

    Long time KM rider here, and I'd like to give something new a try.

    One of my KMs are set up geared and rigid. With a fat tire out back I can't run the wheel all the way forward as I run into FD clearance issues as well as chainstay clearance issues. This is made worse when cornering hard as even though I've got a solid rear wheel (Flow on a CK hub). The handling characteristics I get with the effective short chainstay is something I really like. Also, I personally find 9sp drivetrains (what I'm using) not perfectly suited for 29 rear wheels. The bike is used mostly as a "mule" bike - backwoods ventures on techy, rugged, steep hiking trails - sort of hiking by bike; and for access for "far out" trail work. On paper a 650b out back might make a better set up. A slightly smaller, tougher, wheel that could get up to speed a bit more easily would be nice. The expected geo changes would be small and actually something I'd favor.

    Thoughts?

  2. #2
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    Has anyone tried this? Picking up my first KM frame-set ever today and am thinking of possibilities....

  3. #3
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    Yes....

    Set up SS, run a 19x32 and you get the shortest chain stay possible on the bike, and you can run a very fat 275 with no clearance issues.

    The geo changes are all good as far as I'm concerned. I run it rigid.

    Ran a standard 275 wheel out back spaced out for SS use. Liked it so much I pulled apart my dead 29er SS rear wheel and am having the King hub built up on a 275. Actually, that wheel should be done any day now.

    It is a great bike full 29, but there were some issues: Rear tire clearance when running a very big tire. I prefer a lower BB and slacker angles, both STA and HTA. Running rigid, it is the front end where you need the bigger wheel.

    I run a large on every other frame I own, but on the KM, rigid, I like a tighter bike, so I'm on a medium. That is one of the reasons I think the slacker geo works well for me.

  4. #4
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    Sweeeeet.

    I'm going to run it full 29er to start, but when I start upgrading I wanted to go with a 650b rear. The idea makes sense to me but I was wondering how the ride would change.

  5. #5
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  6. #6
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    I was out riding my 650b Troll yesterday and this very same thought came to me. The Troll works beautifully with a KM fork so I think I can achieve the same HT/ST angles by going with the larger diameter wheel and the stock fork. And because I'm so far ahead of my time I'm going 29-.

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