Quote:
Originally Posted by cmbicycles
Brian, thank you for the info, the dkg link on the seat clamp, and offering to look at it. The frame, I believe, is around an '03-04 custom legend, its a bigger frame with a 63cm seat tube. The 29.5 clamp dkg offers should fit pretty close based on my measurement.
As for reaming the seat tube, would a helical reamer specific to 27.2 be best or will an adjustable reamer work as well/better/worse? Is this something that is best left to a machine shop or would hand tools and lots of cutting fluid suffice? I've reamed several steel and aluminum bikes using an adjustable type hand reamer, but ti is generally harder on tooling.
I'll try to post a picture of where the tube is misshaped, so you can see what I am talking about with that issue.
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I would first try to remedy a collapsed slot, if present, then remove any sharp spots first along the slot and then anywhere else in the area that contacts the seat post.
Only after all of that, to remedy the snug fit, I would suggest the adjustable reamer, creeping up on the fit 1/4 turn of the adjustments at a time until satisfactory. A beautiful and proper helical reamer such as manufactured by Silva is designed for a different job. Reamers are not meant to bore, although in bicycle seat-tube land they are often used for that job. Titanium is hard on tooling that is not designed for titanium. The fact that bicycle seat tube reamers designed for titanium seat tubes don't exist is something apart from those facts. Misuse of the tool can easily be harder on it than its use in titanium. The fact that you've used such an item on various other frames lessens your risk. The cost of a cheap set of replacement blades for the adjustable reamer can be lower than that of a halfway decent contemporary 27.2 seat post. Even if by some twist of fate the blades were 100% ruined by this single use, it is money reasonably well spent. A static helical 27.2 reamer may well not complete the job. It's not imperative to go crazy with lubricant amounts in a careful hand reaming, but they will reduce gouging if your reamer is pretty fresh.
Perhaps the photos will be useful to identify additional recommendations or otherwise provide clarity in identifying the underlying issue, but it does sound like you're trending in the right directions to resolve the seat tube issues. PM me if I can be of any assistance.