if you want a negative shim then i think BRM sells them?
A negative shim is called a reamer and costs a lot more than a shim or even seatpost.
(Adjustable) reamers become very handy when you didn't grease trhe seatpost before assembly into the frame and you cannot get it out anymore after 5 years of maintenance-neglicence.
A negative shim is called a reamer and costs a lot more than a shim or even seatpost.
(Adjustable) reamers become very handy when you didn't grease trhe seatpost before assembly into the frame and you cannot get it out anymore after 5 years of maintenance-neglicence.