MSW ST100 Bottom Bracket - English 73 x 122.5mm Square Taper JIS MFPN=118US The Shimano GRX ST-RX610 dual

The Shimano GRX ST-RX610 dual control lever delivers light and responsive shifting for mixed-terrain riding (Note: BR1057 is a left non-shift variation for 1x set ups)

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4-piston Enduro brake system offers high performance brake control with reduced input force at the finger tips

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MSW ST100 Bottom Bracket - English 73 x 122.5mm Square Taper JIS MFPN=118US The Shimano GRX ST-RX610 dualMSW ST100 Bottom Bracket English 73 x 122. 5mm Square Taper JIS. These high performance square taper bottom brackets from MSW are designed to interface with English threaded frames. TECH SPECS Bottom Bracket Shell I. D. 1. 37 BB Frame Interface English BB Shell Width (mm) 73 Spindle Interface Type Square Taper JIS Spindle Length 122. 5