Enduro Bottom Bracket Seals GXP MR 21537 Variant:Enduro Seal for SRAM GXP MR 21537 AL 21.5mm x 37mm and ensured high endurance

and ensured high endurance

effortless and precision fit backed by the BOA Guarantee

The Forza fabric on the inner leg features 38% Lycra® content for perfect fit

insert the appropriate bit (depending on the bolt you need to tighten)

Enduro Bottom Bracket Seals GXP MR 21537 Variant:Enduro Seal for SRAM GXP MR 21537 AL 21.5mm x 37mm and ensured high enduranceSE MR 21537 AL 6061 SRAM GXP Bottom Bracket Seal 21. 5mm x 37mm Enduro bearings are designed and built to last, but unfortunately sometimes some of the parts that surround them can still wear out. This light contact silicone seal is the same outer seal that comes with Enduro bottom brackets for SRAM GXP cranksets that feature the custom MR 2237E extended race bearing to provide additional protection against the elements.