Bicycle Mechanics - Measuring seatpost offset
Bikeforums.net is a forum about nothing but bikes. Our community can help you find information about hard-to-find and localized information like bicycle tours, specialties like where in your area to have your recumbent bike serviced, or what are the best bicycle tires and seats for the activities you use your bike for.
I like the campy seatpost, but the offset does not work for me. Even with maximum adjustment I'm around 1 cm forward of knee over pedal. I know knee over pedal doesn't mean much, but I generally like setups in that ball park with some tinkering. Currently I'm just falling forward. I figure I need at least another 2cm of offset so I have something to work with. The question I have I how is offset measured so I can shop for a new seatpost.
A new saddle is an option, but since I already own 3 with minimum adjustment a new seatpost would be easier.
Seatpost diameter 26.4
Also any suggestions about which seatpost to buy would be appreciated.
It seems that 26.4 is an odd size. Anyone have any luck with the shims?
Found this NOS for $40. Can anyone tell me anything about it.
You are very unlikely to find a 26.4 mm seatpost that will get you 20 mm further back. Virtually all seatposts with lots of SPO (seat post offset) are 27.2.
05-28-08, 09:36 PM
set back is the horizontal distance between the centerline of the seatpost shaft and the center of the 2 rail clamps. 26.4 is indeed an uncommon size now. I have old bike with a 26.8 seatpost....perhaps you could buy a 26.8 and have it turned on a lathe, of course if you had to pay for that it would exceed the cost of the post...
Really appreciate the advice. Can't say I was happy to hear it.
The milremo looks like it might give me at least a centimeter of play just because of the way it clamps. Anybody know anything about this brand.
I have also been looking at using a 25.4 seat post and shiming. I have found a few with 20mm setback that might work. Anyone have anything positive or negative to say about shims.
Thanks for any help.
Powered by vBulletin® Version 4.1.12 Copyright © 2013 vBulletin Solutions, Inc. All rights reserved.