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Tiagra ST-4720
linear-pull and mechanical disc brakes
The system is tested to IP69K water and dust proofing standard for creek crossings
For use with mineral oil brake systems only
Shimano BB-MT501 English Bottom Bracket - English, 68/73mm, Fits Hollowtech II Spindle, Black bmx Tiagra ST-4720The Shimano BB MT501 is a precision engineered bottom bracket designed for mountain bikers demanding reliable drivetrain performance. This English (BSA) threaded unit accommodates both 68mm and 73mm frame shells, making it compatible with most modern MTB platforms. Built around Hollowtech II spindle compatibility, it features sealed cartridge construction that resists contamination and moisture intrusioncritical for off road conditions. The aluminum
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