K2 / Proflex Riders Group

General => Tech Forum => Topic started by: doctorsimpson on January 11, 2010, 08:08:31 am

Title: Seat Shim
Post by: doctorsimpson on January 11, 2010, 08:08:31 am
Does anyone know if it's possible to use a shim to make a 26.8 seat post fit a 27.2 seat tube?  I've looked and found shims for larger size discrepancies but not one this small.  I did find some aluminum sheeting in 26 gauge (0.0157") but before I buy it I was hoping someone could let me know if they have done this before.

TIA
Iain
Title: Re: Seat Shim
Post by: shovelon on January 11, 2010, 08:52:53 am
Does anyone know if it's possible to use a shim to make a 26.8 seat post fit a 27.2 seat tube?  I've looked and found shims for larger size discrepancies but not one this small.  I did find some aluminum sheeting in 26 gauge (0.0157") but before I buy it I was hoping someone could let me know if they have done this before.

TIA
Iain
26 gauge won't work as you need to divide the diameter differences by 2, thus you need .007 shim stock.

U.S.E. makes a 25mm to 25.4mm rolled shim that you could spread open. That is the way I would go.
http://www.use1.com/products/seat_post_shims/index.php

Terry
Title: Re: Seat Shim
Post by: doctorsimpson on January 11, 2010, 09:01:58 am

26 gauge won't work as you need to divide the diameter differences by 2, thus you need .007 shim stock.

U.S.E. makes a 25mm to 25.4mm rolled shim that you could spread open. That is the way I would go.
http://www.use1.com/products/seat_post_shims/index.php

Terry
[/quote]

Thanks for the info and link Terry.  Ummm...yah...math was never my strong suit but of course that makes perfect sense when you explain it.
Title: Re: Seat Shim
Post by: orange on January 11, 2010, 02:10:17 pm
I would use coke cans or similar for that sort of discrepancy
Title: Re: Seat Shim
Post by: doctorsimpson on January 13, 2010, 05:08:10 pm
I would use coke cans or similar for that sort of discrepancy

That sounds brilliant.  I'll give that a try first.

Thanks

Iain