Chris King Seal & Snap Ring Kit For Rear Classic, ISO Disc,Single Speed, and BMX Hubs only / PHB536 CK_BOOST_HUB These springs can be used

These springs can be used with bikes featuring linear or modestly progressive leverage curves that traditionally needed air shocks

Extralight casing Ultra-light

double-row pawls that are heat treated to be one level softer than the ratchet ring

Standard casing Supple casing

) and high quality user-adjustable sealed cartridge bearings

Chris King Seal & Snap Ring Kit For Rear Classic, ISO Disc,Single Speed, and BMX Hubs only / PHB536 CK_BOOST_HUB These springs can be used(Includes the PHB553 O Ring Kit) For Chris King REAR Classic, ISO Disc, Single Speed, or BMX hubs only Servicing your Chris King hub regularly will make it perform its best. O rings and seals don't normally need to be replaced with every cleaning or service, but after a while, it's a great idea to refresh your hub's seals to maximize your hub's ability to keep the grit out. To replace the most exposed seals in your hubs, no special tools are needed.