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Will grab a picture of the front chainring tomorrow, thanks both for the input! How do I check for stiff links? I could try running it free for a bit (reluctantly) but I can’t replicate the issue even if it’s fixed, and it’s occurred about once every two weeks or so with daily commutes to multiple places?
The cranks definitely did lock up momentarily, hence coming unclipped each time, but given it’s fixed presumably that would have happened regardless of whether it’s the wheel or the chainring locking up?
youClown-
To check for stiff links derail the chain and then use your fingers to try to bend every link in turn, see if any are stiff.
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What is the chain line like I. E. If it is a conversion have they got a decent chain line with the rear cog in line with the front?
Or is a small stone/chip getting stuck on the tyre and carrying around to get jammed under the mudguard and/or brake caliper?
Given the decent weather why not run it without the mudguards and see if that helps.
Ndeipi
MTB-Idle
Seems very mysterious to me. The only time anything similar has happened to me was when track nuts weren't done up tight enough. The rear wheel would end up jammed against a chainstay. But if you are finding your rear wheel still centered then I would guess that it's a drivechain issue.
The only thing I can think of is that perhaps the chain managed to swing inboard, or was nudged by your foot, such that the tip of the chainring got caught under the edge of the chain link plate. Like halfway towards derailing the chain. This would lock up the drivechain instantaneously.
Did you feel the cranks lock up at the time?
Also can we have a closer side view of the front chainring?