Internally expanding design fits most frames, including those with Swiss threading and frames with damaged BB shells. Installation requires only a traditional-style BB spanner or a pin wrench. The BB shell does not require chamfering or facing and the unit is easily removed so the existing threads may be reused. Sealed cartridge bearings for long service life. JIS spindle taper. Due to the larger diameter BB shell, Italian threaded bottom brackets are not compatible. Boron steel hollow axle.
Chromoly spindle, sealed cartridge bearings
Threadless version work well in English, French, Swiss shells as well as bottom bracket shells with damaged threads with no facing required (does not work in Italian shells)
Threadless versions expand to tighten into the bottom bracket shell without damaging threads; once removed the original threads can be reused
English and French models use Shimano-spline installation tool; threadlessuse standard bottom bracket spanner and pin spanner
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