which means

Medium stroke 1

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We use these boots with SRAM cranks and they have held up extremely well

If the post bottoms out inside the frame before the post collar hits the seat clamp

Wolf Tooth B-RAD Base Mount - Black - 4 Slot eBay which meansB RAD (Be Rad), Bottle Relocation and Accessory Device, is an innovative and extremely flexible system for organising on bike bottle and accessory storage using bottle cage mounts. The system includes 3 different mounting bases, the B RAD 2, 3 & 4, and a growing number of mountable accessories. This product page is for the mounting bases. The rest of the B RAD system accessories mount to these bases. See compatibility section below for dimensions. B