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@boggy
Took my colnago out of attic for ride now that weather turning better. Took off wheels to give everything good clean and lube before riding out today. Straight away noticed gears/chains jumping. Then when going up a hill and especially when getting out of the saddle the gears started jumping and the rear wheel started to move until it sat tight up against the caliper and stuck hard. Nearly fell off bike when it locked up suddenly. Got off and adjusted wheel and tried again. Wheel started moving again. Any ideas on what is happening?