This conversation is over my head technically, so what I have to contribute is more of a confession than a suggestion. Some weeks ago I posted that I was having a similar problem on my Clem, which is totally stock, including the tires. Chain touched rear tire in low-low combination. Got lots of patient advice and some commiseration. Later I was looking at it on the stand again and saw that the chain only dragged on the bottom, going towards the rear derailleur. On the top, going towards the front ring, no drag. So I adjusted the limit screw on the rear derailleur, problem solved. Embarrassing to admit, but I simply had the RD out of adjustment.
Someone told me in that thread that long chainstays = less clearance between chain and tire, which did not make sense to me until I finally sat down and drew it on paper. Yep, it's true, clearance is tight but the stock Clem is fine when the RD is adjusted right. I've learned a lot from this group. Jim On Thursday, June 25, 2020 at 8:39:33 PM UTC-4, David Wadstrup wrote: > > Hello, > > I've been building my Susie over the past couple of days, and just > discovered I've got an issue with the chain rubbing the rear tire when I'm > in the lowest gear. It's a Shimano 2x12 drivetrain, and seeing as it's not > a square taper BB, and has more than 9 speeds, I'm out of my league. The > tire is a 2.6 Teravail. Does anyone have experience with this kind of > problem? > > The only real solution I can think of is to add a 2.5mm spacer to the BB's > drive side. The chain just ever so slightly touches the tire now, and so > I'm hoping that moving the chainrings out 2.5mm will be enough to solve the > problem. BUT.... > > A part of me wonders whether this is advisable. Will my shifting be > compromised due to altering the chainline of the crank? Will widening the > space between the BB's cups harm the BB due to lessening the thread > engagement? Will it harm the cranks for the same reason? Is this solution > more of a problem than the rubbing problem? > > What about other solutions? Does anyone have any advice? This is driving > me crazy, and I'd really love to hear any and all suggestions! > > Thank you! > -- 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/c0643395-55a2-4755-9fbe-9c38e3fe3c26o%40googlegroups.com.
