Thomson Masterpiece Seatpost

You need to find that out from your bike's frame manufacturer. For example, Specialized frames have a tiny hole which marks the minimum insertion depth of the seatpost. If there is no mark on the frame, get ahold of your bike's frame manufacturer. Don't "guess", you could break your frame....

Isn't this marked on the post itself?

Whatever you do, don't assume the minimum insertion for the seatpost is the same as the minimum insertion requirement for the frame. A lot of seatposts only need 3" of insertion to prevent the post from bending, but most frames require the bottom of the seatpost extend below the lowest point of the top tube/seat tube junction to avoid frame damage.

Have a look at figure #7

http://www.lhthomson.com/docs/seatpost.pdf

This drawing has the post minimum insertion dimension shown

http://www.lhthomson.com/docs/updated_pdfs/08_ Elite_SP_ Dims_revA.pdf

Yes, it is marked on the seatpost, however the true "weight weenie" is going to cut the seatpost to it's absolute minimum legnth to shave as much weight as possible. That's why using the frame's manufacturers minumum insertion legnth is most important in this application.

wow, hey thank you very much Kevin.....exactly what I needed

Some bike manufacturers use a common formula of 2.50 x seatpost diameter.So for a your seatpost, 31.6 x 2.50 = 79mm.

doco said:

Would anyone have the minimum insertion point measurement for a Thomson Masterpiece post...31.6 diameter ?

thanks

Click to expand...

87mm per Thomson website

Here is the current chart for both straight and setback seatposts
http://bikethomson.com/wp-content/u...atpost-dimension-sketch-for-website-rev_C.pdf