It is suitable for many bicycles. A is suitable for SUNTOUR three forks (XCR/XCT/XCM) and RST, B is 27mm for pneumatic front fork SUNTOUR EPIXON, and the old EPICON is 28mm for X-FUSION. Applicable: Type A is applicable to SUNTOUR Santuo (XCR/XCT/XCM) and RST forks, while Type B is applicable to most pneumatic forks.