Enduro ZERO Derailleur Pulleys for Shimano 11-speed ModelNumber=K1539 Tight enough tread spacing for

Tight enough tread spacing for high speed drag-free onslaughts yet blocky and tall enough to really dig in when it comes time to slam on the brakes

}SRAM GX Eagle XG-1275 Cassette - 12 Speed 10-50t Black For XD Driver Body

Grade 3 Silicon Nitride balls

PU pulley uses sealed bearings

Wolf Tooth Performance Headsets are machined out of aircraft grade aluminum and assembled with Black Oxide Cartridge Bearings balancing quality and price

Enduro ZERO Derailleur Pulleys for Shimano 11-speed ModelNumber=K1539 Tight enough tread spacing forEnduro ZERO Derailleur Pulleys for Shimano 11 speed. Enduro Zero Pulley Assemblies use grade 5 ceramic bearings. Races are won and lost by derailleur pulley drag. Sold in Pairs 9 Grams ABEC 5 precision cartridge bearing CERBEC USA Grade 3 Si3n4 Silicon Nitride balls 52100 high carbon Chromium alloy races Races receive 3 cryogenic treatments and a rust proof Magnetite finish "VV" type 2 lip non contact Silicone labyrinth seals Nylon graphite retainer