• PRO-level hubs come with ceramic balls, low-friction cages, and hardened stainless steel races.
• Premium-level hubs come with premium-grade stainless steel bearings and races 
• Foundation-level hubs come with premium-grade steel bearings and races. (All replacement/repair kits will include Stainless bearings regardless of OEM bearing. Bearing Sizes are the same for Foundation and Premium hubs.)

- Non-contact inner bearing seals to reduce rolling resistance.

- Full-contact outer seals ensure debris-free performance and bearing longevity.