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weird tri-fit question(2 posts)

weird tri-fit questionempacher6seat
Nov 5, 2002 1:20 PM
Right now I'm riding a road bike with a seat tube a couple of cm too large for me, and a top tube too short for me, as far as conventional road geometry goes (61cm seat tube, 56cm top tube). I'm considering buying a new bike, but I would like to know if I can convert the one I have now into one with more tri-appropriate geometry. I know the top tubes on tri bikes are shorter to allow a 90 degree angle between the humerous and forarm, but what needs to be done to the seat tube for tri bikes? Are they longer or shorter then those on regular road frames? Is there any way of salvaging this bike?
re: weird tri-fit questionbrider
Nov 6, 2002 7:33 AM
Well, if this is a true road geometry, you're probably starting out with the wrong frame (BTW, that's a pretty strange geometry to begin with). What is the seat tube angle? In general, aggressive tri geometries are in the neighborhood of a 78-degree seat tube angle. If you're going towards that geometry, you'de want to put the seat forward either on the the existing seat post, or buy one that can be flipped forward. The will REALLY exacerbate the short top tube. You'd be putting a pretty long stem on that bike, and placing a lot more weight forward -- not good for handling. If you can find some one that will allow you to use the parts, you can give it a try and see if you're okay with the handling. Also, seat tube lengths are just as they are for road geometries -- either spot on (for "standard" frames) or short (for compact frames).

If you're very flexible, and can fold yourself up and still ride and run, then you might be able to get by with some shortie aero clip-ons. Something akin to a "slam" position (see Slowtwitch.com for some descriptions).