i have a 30.8 seat post which hope qr size do i need
thanks in advance

None – get a salsa or something else that actually works well )

Chromag one is the best on the planet

Size is determined by the frame, not the seatpost. Agree with the above too: I like Salsa personally.

jameso – Member

None – get a salsa or something else that actually works well )

This.

I’ve had two, one specifically custom made for the frame.
Both failed to work.

The On One one’s (I have the more expensive one, about £8.00?) work miles better.

Hope are generally very good – but unfortunately their QR seat clamps are HOPELESS!

Arse, I still have a silver 31.8mm to sell, should’ve done so before opening my big mouth..

(mint, MIP / any fair offers, etc..)