Our GXP-LEFT open bore adapter is used to press 22x37 sealed bearings into SRAM GXP bottom bracket cups and direct fit frames like trek BB90. The adapter is machined with one step at 22mm OD, which fits into the center of the sealed bearing. - Installs: 22x37 (GXP) bearing - Inner step outer diameter: 21. 9mm - Outer diameter: 36. 8mm - Thickness: 7mm - Thru hole diameter: 0. 387" (9. 8mm) - Inner hole sized to fit 1/2" ACME threaded rod - Compatible with BP0006, BP0007 - Machined, red anodized aluminum - Sold individually