J
Jean
Guest
I just bought a new seatpost for my road bike, but I need to use a shim for it to fit the seat tube
(25.4mm post => 26.0mm seat tube inner diameter).
The local bike shop has a shim available, but it is only about 48mm long. I vaguely remember that
the minimum seat post insertion is supposed to be at least 2.5 times the seat post diameter
...which, in my case, yields a minimum insertion of 65mm.
Also, the short 48mm shim would not extend below the welds on the seat tube -it would have to be at
least 52mm long to extend below all the welds.
Will using the "too short" shim unduly stress the seat tube (steel) and/or the seat post (aluminum)?
Would the post wobble in the tube if subjected to heavy load?
Thanks for any guidance,
Jean
(25.4mm post => 26.0mm seat tube inner diameter).
The local bike shop has a shim available, but it is only about 48mm long. I vaguely remember that
the minimum seat post insertion is supposed to be at least 2.5 times the seat post diameter
...which, in my case, yields a minimum insertion of 65mm.
Also, the short 48mm shim would not extend below the welds on the seat tube -it would have to be at
least 52mm long to extend below all the welds.
Will using the "too short" shim unduly stress the seat tube (steel) and/or the seat post (aluminum)?
Would the post wobble in the tube if subjected to heavy load?
Thanks for any guidance,
Jean