Needing some confirmation that I'm doing things correctly with a new IRD crankset and x-type bb, from SOMA, that I'm putting on an old bike. I mostly have square-taper setups, so I'm fairly new to these external setups. The others that I have are different (and more logical) but I suspect this new one is actually more standard.
Question has to do with spacers and their configuration. And lack of symmetry! The crank and bb fit either 68mm or 73mm shells. In this case, the spacers go between the cup and the threaded shell. If there were two 2.5 mm spacers, things would be obvious: one per side, 5mm total + 68mm = 73mm, symmetrical. But there are three 2.5 mm spacers and, through trial and error, I discovered that I need all three to take up side-to-side play in the crank. The problem is that no arrangement of the spacers will give me symmetrical, lateral positioning of the crank arms. If I use two spacers on the drive side and one on the n-d side, the arms are offset 2.5mm to the left (more space between the left chainstay and the crank arm), if I put all three spacers on the right, it is 1.75mm too far that way but, more important, seems fragile in a sort of cantilevered way, with not enough threads engaged between the cup and the shell. Do people usually just live with the crank being offset to the left? The perfectionist in me has a hard tine accepting that something isn't wrong. I've offset phil-type bbs, with separate retaining rings, to adjust chainline or clear a chainstay, but never this severely. Do shops keep thinner spacers around and just use those instead, for better adjustment? (My other x-type bbs are on mountain bikes with 73mm shells, and the spacers went between the cups and the arms, and were thinner, to allow much more fine-tuned adjustment). -- 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/e7100b64-084a-4ee0-ada0-c7c4b084787an%40googlegroups.com.
