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Thread: Geometry

  1. #1
    Mitcholo CrimsonKarter21's Avatar
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    Geometry

    So I'm going the custom route for my new pursuit bike. I'm getting a mix of a Specialized and a Serotta fitting to determine tube lengths and all. But I want to be able to use this bike in other non-individual events too, for this kind of application, would a 75 seat tube and a 74.5 head tube be a good bet? I can't really find any pursuit-specific bikes on the internet (at least ones that advertise being pursuit-only).

    Can I get some help? Also, since it's a TT bike, should I still stick with a short raked track specific fork, or go with more of a road TT fork?

  2. #2
    Senior Member melville's Avatar
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    Quote Originally Posted by CrimsonKarter21 View Post
    So I'm going the custom route for my new pursuit bike. I'm getting a mix of a Specialized and a Serotta fitting to determine tube lengths and all. But I want to be able to use this bike in other non-individual events too, for this kind of application, would a 75 seat tube and a 74.5 head tube be a good bet? I can't really find any pursuit-specific bikes on the internet (at least ones that advertise being pursuit-only).

    Can I get some help? Also, since it's a TT bike, should I still stick with a short raked track specific fork, or go with more of a road TT fork?
    Seat angle depends mostly on your thigh length relative to your total leg length and height. Look at what you're riding now and see where your seatpost is clamped on the rails. Ideally (same saddle) you should be clamped in the middle of the rails. Figure one degree of seat angle to be somewhere around 1 to 1.2 cm of movement on the seat rails.

    Do your fit programs speak to seat tube angle or do they just point you to specific stock models?

    Fork rake should match your head angle, with a general recommedation of less is better. Less fork rake will get you more trail, which will make the bike more stable. I think you'll favor stable both for TT events and for mass start. I know I did--great to have people bounce off you without getting put off your line. Seems to me that most road forks are figuring a 73ish head angle, so may not get you what you want in a track bike if you go 74+.

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