Peachy!
Retrobike Rider
BoTM Winner
Gold Trader
rBoTM Triple Crown
rBotM Winner
98+ BoTM Winner
Claud Butler Fan
VCC Claud Butler ME
- Feedback
- View
Dude…. Breath….Guys, FFS, talk about the blind leading the blind! This is a real downside of forums, where all sorts can post irrespective of their knowledge of cycle mechanics. You end up with lots of "advice" that isn't worth a cup of cold tea, and the odd well-informed post getting lost in the noise.
No one, absolutely no one, has mentioned that simple and effective piece of kit ... A SEAT POST GAUGE. It costs about £20 from the likes of SJS and will tell you in 5 seconds what the correct seat post size is for your frame.
The seat cluster lug (assuming you have a lugged frame) or top of the seat tube (for a lugless frame) is almost never round because of heat distortion during manufacture. (Sometimes a diligent frame builder will ream it to be nicely round after building, but that's unusual.) So stick the gauge in, let it find its natural position, and read off the required set post diameter. Now you know what the correct seat post size is supposed to be. But be aware that no manufactured article is ever completely round and there are always manufacturing tolerances. This is why measuring with a Vernier is effing hopeless ... it will only measure the diameter at one point on the diameter but the bloody thing ain't round! Never mind, a decent manufacturer can be reasonably relied upon to get this more or less right. So get a seat post of reasonable quality in the nominal, measured size and get on cycling and enjoying life.
Phew!
(& it’s cold piss)
Last edited: