If that photo Eric is of the bike in question, well sheesh, that saddle ..... it's already so far forward in the seatpost ! MB-2's have a minimum of a 73d STA, so that only adds to the forward position in relation to the BB. A Brooks saddle with it's limited rails + the steeper 73d STA angle = you're hamstrung from the beginning in your ability to move the saddle back enough relative to the BB. I forget the Trig formula but 1d of STA is substantial in terms of saddle height fore-aft position relative to the BB, somewhere in the range 10-15mm I think, depending on saddle height. The SR setback post is a way to get back further, though not necessarily enough to compensate for the basic design limitations of frame and saddle. A saddle with longer rails could account for 15-20mm of setback alone though.
For reference, a Ritchey Comp 2-bolt 26.8 post(sold in Europe) for example, has 25mm of setback. A Nitto S-83 has 23mm, an SP-72 Jaguar 25mm. Your average Kalloy post has 20-24mm, though their clamps are often small fore-aft relative to high quality posts. Thomson bent posts offer a meager 16mm. The Suntour posts were usually 23mm-ish, give or take. Hardly worth buying a new post for a few mm's. In the absence of a wayback post, you're better off changing the saddle to something with much longer rails for that frame, if you're not deathly attached to a Brooks. If you are, then you'll need very long setback post like the SR, or if you have slippery a IRD post on hand, heck, try some anti-friction paste inside the serrations. Has anyone who had them slip contact IRD or even Riv about it ? They can't all be wonky all the time for everybody. (Ibob group can't be viewed unless you're a member of the particular group.) -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/rbw-owners-bunch/d150aaa7-fc91-41b5-a541-a9e37589b34bn%40googlegroups.com.
