I heard alot of creaking once from this old T-Bird I bought to ride around on, £10 who could refuse? Anyway, the BB was supposed to be square taper and the cranks just rounded it and everytime I rode it, it allways creaked then aventually I was riding down a hill and my cranks came off, was pretty funny. Double check and make sure the cranks are tight and the BB is ok, mine were on tight but still BB was f**ked.