This is nothing to lose sleep over. As Bill already pointed out, the most this could be off by is .5 mm and more likely closer to .25 mm. That's 10 thou. Or 250 microns. Or a few human hairs. Or a couple of sheets of paper. Just ride my friend. On Wednesday, April 30, 2025 at 5:43:47 PM UTC-7 Steve wrote:
> Good points Bill - I didn't consider that the 110.5 spindle might be > asymmetrical. > Also, if it is symmetrical, it will only push the drive side out 0.25mm > (duh). Sean, if you decide to use the 110.5 let us know the results. It's > always good to keep learning and this forum is a great place to do so. > > Steve in AVL > On Wednesday, April 30, 2025 at 7:55:33 PM UTC-4 Bill Lindsay wrote: > >> The dimension that determines your chainline has to do with the spindle >> stick-out relative to the fixed cup. Hold the new unit up to the old unit >> with the drive side ends facing each other. Are they about the same >> length? Then the chain line will be about the same. If they are not the >> same length in the drive side stickout, then that tells you how much your >> chainline will likely change. >> >> Now, in the real world, the two spindle tapers may not be identical in >> geometry so the same crank may push on farther or not as far onto one >> versus the other, but let's just pretend that all JIS tape BB spindles are >> close enough to identical that we can ignore that part. >> >> So, maybe the extra 0.5mm is on the drive side. Maybe it's on the >> non-drive-side. Maybe it's 0.25mm on each end, or some other >> distribution. At the end of the day, the impact will likely be small. If >> you are the mechanic, you need to apply your mechanic's judgment. >> >> Bill Lindsay >> El Cerrito, CA >> On Wednesday, April 30, 2025 at 2:39:09 PM UTC-7 Sean B. wrote: >> >>> I'm replacing the BB on my Homer. Went into a shop asked for a 68 x 110 >>> BB (the box was labeled as such), but when I got home I noticed the actual >>> part was labeled as 68 x 110.5. Can a .5 variance cause any issues with the >>> chainline? >>> >> -- 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 [email protected]. To view this discussion visit https://groups.google.com/d/msgid/rbw-owners-bunch/7a6d4c3a-b7fa-4cb6-8a09-ee4a1e5696d3n%40googlegroups.com.
