For the record, I’m using a 122.5 mm spindle on my Susie with a 1 mm spacer added to the drive side. It gives plenty of clearance with 2.3’s. I am using a 2 x 7 setup, so my biggest sprocket is a little further away from center, but I think I could still clear the tire even if it were closer. If I were using 2.6’s with a 11 speed cassette, I’d probably get the Shimano bb that has a 123 mm spindle with a 2.5 mm spacer on the drive side. I wouldn’t think there would be a chain rub issue with that setup.
Sent from my iPhone On Jul 6, 2024, at 11:23 PM, Patrick Moore <bertin...@gmail.com> wrote:
First, check chainline.
Doesn't the Gus have typical long Rivendell stays? This should structurally minimize the chance of such chain rub, so perhaps your spindle is too short for proper chainline. Does Riv spec a spindle length for that frame and a 1X11?
OTOH, if the chainline is correct but you still need to add another couple of mm to the drive side spindle for the chain to clear the tire, perhaps adding a 1 or 2 mm spacer behind the DS cup will fix things, chainline be damned.
IMO chain clearance is more important than a perfect line. To paraphrase what Grant said years and years ago when someone fretted that slighly imperfect chainline might accelerate chain and sprocket wear, "If you are riding enough to replace chains and cogs more frequently than you think you should, then you are lucky to be riding so much." And modern chains do tolerate a lot of deflection without greatly affecting performance or wear.
David, would a wider bottom bracket axle solve the issue? How long is the current one?
On Saturday, July 6, 2024 at 5:40:45 PM UTC-4 David Ross wrote:
I built up a Gus recently. I used a 1x11 Deore derailleur and the chain rubs the tire in the largest cog. The chain above the chain stay clears the tire, but below the chain stay the chain rubs the tire. Is my problem 1x11 cassettes with 135 spacing? I'm only running 2.25 tires and the Gus is rated up to 2.6. Any help would be much appreciated.
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