How Cani Clean A Bicycle Crank Arm?
How Cani Clean A Bicycle Crank Arm? WD-40 is a penetrating oil. It will happily creep past the seals of the bottom bracket and thin out the grease lubricating your bottom bracket bearings. Once the grease has thinned, it won’t lubricate the bearings as well, and it will want to work its way back out