tony.mon wrote: ↑Tue Aug 31, 2021 5:24 pm
To be fair, if o-rings break up they don't crumb, they just split at one point and are thrown off leaving a rattly chain.
Have you had a chance to check the cush drive rubbers yet?
yes last time I change the tire less than 500km ago they were perfects. they are also inside closed in they wheel, I doubt they can spread rubber dust outside of it.
I think is the oil I use to lube the chain that attract rubber on it
I had this once and eventually worked out that I'd installed the stock rear mud flap incorrectly. IIRC there are a couple of ways it can be wrong, as it isn't symmetrical and also there's a choice of which side of the mounting tab it's on, and only one is correct. It was only rubbing once my weight was on the bike so looked OK superficially when I was looking around trying to find the source. It wasn't bits of rubber but in fact bits of the plastic of the mudguard.
jchesshyre wrote: ↑Tue Aug 31, 2021 11:01 pm
I had this once and eventually worked out that I'd installed the stock rear mud flap incorrectly. IIRC there are a couple of ways it can be wrong, as it isn't symmetrical and also there's a choice of which side of the mounting tab it's on, and only one is correct. It was only rubbing once my weight was on the bike so looked OK superficially when I was looking around trying to find the source. It wasn't bits of rubber but in fact bits of the plastic of the mudguard.
Wow. There's your issue! Not sure why that's happening quite that badly though. Study this diagram and see if this is how you had it mounted (both in terms of the orientation of the flap and which side of the mounting strip it's on).