RK 520 EXW is designed to meet the Extreme requirement of rally races such as Dakar Rally, featuring RK?s only technology of XW-Ring and improved Thermal Fatigue Resistance.Application:250-750cc"
"8866
RK XSO Series: Designed for Basic Motorcycle Models, Features RX-Ring that have ?X? shaped seals and improved metallurgy giving you 2 times longer wearlife than standard O-Ring chains."
"370100