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https://dassets.shimano.com/content/dam/global/cg1SHICCycling/final/ev/ev/EV-BB-UN300-4708.pdf
it isnt listed on the blown up pdf document. (its not the chain case stay)
but it reads "Better chainline stability with chain line stabilizer" Maybe this is what they are for. Chainline stability???? (Photo attached)
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gubhi
snottyotter
That's a UN300 113mm.