ENDURO "ZERØ" SERIES PULLEY SET FOR XX1, XO1, and X1 11 SPEED DERAILLEURS

-SUPER LIGHT DELRIN® WHEELS

-GRADE 3 SILICON NITRIDE CERAMIC BALLS

-CHROMIUM STEEL RACES

-3X CRYOGENIC TREATMENT ON RACES

-MAGNETITE FINISH ON RACES

-ALUMINUM DUST COVERS

-INCLUDES UPPER AND LOWER PULLEY

Underneath the custom machined and anodized dust covers lie Enduro ZERO Series ceramic hyrid bearings. USA-made Grade 3 ceramic balls are housed in highly polished, cryogenically treated SAE52100 chromium steel races, sealed with double-lipped non-contact silicone seals, and lubricated with Realube Bearing Compound for the ultimate in friction reduction.

(Each kit contains one upper and one lower pulley)