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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 10-06-03, 11:33 AM   #1
dafydd
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TT bike and seatpost insertion

Hi, been lurking for a while and have valued the information I've read, and hope to contribute in the future. But at the moment I have a question:

I recently aquired an older time trial bike from a friend. It is of unknown origin, but is of quality steel (SLX or 531) and is fillet brazed (or extremely well-finished tig). Due to its compact design the seat tube extends about 4 cm beyond the top tube. I want to use an old aero seatpost (shimano 600), but when used it would be buried up to the aero part, with the actual inserted shaft being about 4 cm, so maybe just a tad inside the joint.

The person I bought it from thinks this would be fine because it is of quality steel. Part of me agrees with this, and also thinks if brazed it would be a bit stronger at the junction. However, most of me thinks I'd be flirting with breaking off the extension, not to mention hurting myself pretty good. My weight is usually between 150-160 lbs, and i do push the saddle all the way back on this bike. I should mention that there's a fine seatpost on the bike already (suntour superbe pro) and therefore have no great need to put the shimano post in. I also should mention that I'd like to drill the seatpost a bit, for bikedork's sake.

Opinions?
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Old 10-07-03, 11:55 AM   #2
Jonny B
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Always make sure the post is down further than the joint with the toptube and seatstays, and generally as far in as possible (drill out the bottom few inches rather than cutting it down, just make sure the holes are smoothed off).
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Old 10-07-03, 02:41 PM   #3
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Jonny is right. Make sure the post is inserted past the joints at the toptube seattube seatstay junction. With an aero post its also importamt that the aero part is not inserted in to frame. Welcome to CATCH-22
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Old 10-08-03, 08:35 PM   #4
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That's what I unfortunately figured. Thanks for the feedback!
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