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Thank you, and yes, we have the thick chainwheel with the sensor attached to the inside that gets ripped off everytime the chain comes off so maybe as you suggest, replace everything. Any particular kit suggestions, this is a 250w but Ive seen 350w and 500w that are 36v, but dont want to push...

Hi everyone, My son has the above bike, riden it for 3 years over 4000 miles and a few days ago it started making a god awful noise, after stripping it down we found there are very little to no teeth left on the nylon planetary gears. They can easily be replaced but we are struggling to find...