This adapter inserts in to the left hand non drive side BB cup. HTII to SRAM GXP Bottom Bracket Adaptor. This BB shim simply reduces the inner bearing race diameter from 24mm to 22mm. It will not change or alter any other dimension of a bottom bracket. The adapter ring adopts aluminium alloy material, high strength and anti-rust,wear-resistant and durable. Fit for various bikes, can effectively loosening or repair your bike. Package includes 2 pieces bottom bracket adapter. Part Type Bottom Bracket Material Aluminum Alloy Colour Silver Inner diameter 22 mm Outer diameter 24 mm Type Bottom Bracket Adaptor Brand Unbranded/Generic MPN MEM94927111521 EAN 4894927111521 .