'- This bearing has an exceptionally fine polished surface finish on the bearing tracks and incredibly precise balls.- Light weight plastic cages create lower rolling resistance.- Ceramic balls not only generate less heat but offer considerable weight and friction benefits.- 688 bearings offer a significant weight advantage.- Made in Switzerland.
* This product requires cylinder spaces, not the normal self centering spacers.
*688 bearing adapters fit over your 688 bearings so that they can fit into 608 wheels.