12-05-2018, 11:03 AM
(12-05-2018, 08:04 AM)Canard Wrote: Not so much of an issue of not being able to, more of an issue of having a 30-40 mm tube being clamped supporting a moment arm 1 or 2 m away. Doing any work at the ends of your bike make the whole thing bounce and jerk. It’s a huge moment on a small mounting point. It’s just a very bad design.
Seatposts are incredibly strong... on bikes with seized posts I've clamped the post into a vice and reefed on them with much more force than any standard repair done in a stand, some will break and snap, others twist and fold but it's so far beyond the amount of force one would be able to put into a small allen screw with hand tools it's never been a concern for most bike shops in the world. I even clamp my carbon bike in a repair stand... it's never gonna be an issue if you just snug it up. And if you're still worried about clamping the seatpost you can just clamp the frame tubes somewhere else... any good bike stand will have jaws that open enough to clamp round-ish tubes that are bigger and they come with softer jaws that shouldn't mar the finish. I sometimes use a rag as an extra measure.
I've been volunteering at recycle cycles for almost a decade and I've never seen or heard of someone damaging their post or frame by clamping it by the seatpost.
Like jamincan says, pedals are easier on the ground since you can stand on a stuck pedal to hold the crank, and some goes for a stuck bottom bracket. Taking apart a threadless headset is way better on the ground too... the nicest stands can hold the bike upright and still keep the weight on the ground.
(I use the parking brake on my car)