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have you got a bosch motor? assuming its a gen2 from the size -
if so buy sprocket by KMC or boschcrank arm comes off as normal, lockring for the chainring needs a chain whip and (special?) lockring tool. theres a little o ring underneath the lockring i think that you need to get out before whipping the cog off.
MCamb
ian(conker)
Getting a lot of grinding noise since I put a new chain my Urban Arrow & guessing the chainwheel wear is the issue (only happens when I put pressure on the pedals). The spec sheet says it's a "Hebie chainring 18T". Anyone one here changed one? Wondering how simple/difficult & if I'd need special tool/s? I have a crank tool that I used to remove the L/h crank when fitting a tracker