• Brakes rubbing a tiny bit? Especially if discs, a or hub seal maybe. Brakes check that rotors or rims are true, hubs a tiny bit of gt85 then test ride to see if it's gone will help narrow it down, be very careful with the spray if it's discs, freehub can be checked in a similar way, deore ones aren't really serviceable but ready enough to replace.

  • Been messing about with it now for a while and fairly sure it's the front wheel not rear - it's an SP dynamo with BB7 discs. Think dynamo hubs aren't serviceable? So I'll start with the brake, which might be rubbing just a teeny tiny bit. Being a dynamo, the wheel doesn't spin forever anyway so it's hard to tell if it's just that or if there's a miniscule amount of brake rub.

  • Did you ride in the wet recently? Discs are a great source of noise but I've also had my SP dynamo squeal a bit after a very soggy ride. It went away after a couple of rides.

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