COONIUM Thread-Together Bottom Bracket for 42mm ID BB30/OSBB Press-Fit Shells (68/73mm) to 24mm Shimano or 22/24mm SRAM GXP Cranks, Ceramic Bearings - NOT for 30mm Spindles

COONIUM Thread-Together Bottom Bracket for 42mm ID BB30/OSBB Press-Fit Shells (68/73mm) to 24mm Shimano or 22/24mm SRAM GXP Cranks, Ceramic Bearings - NOT for 30mm Spindles

• ✅ CHECK THIS FIRST - FITS 42mm ID SHELLS ONLY: Your frame's bottom bracket shell must measure 42mm inside diameter and 68mm (road) or 73mm (MTB) wide. This is the BB30 / OSBB press-fit standard. Measure with a caliper before Ordering.
• ❌ WILL NOT FIT 30mm SPINDLE CRANKS: This bottom bracket ADAPTS a 42mm shell to a 24mm crank. If your crankset has a 30mm alloy spindle (stock BB30 cranks, Rotor, Praxis M30) or a SRAM DUB 28.99mm spindle, this is the wrong part. Also does NOT fit PF30 / BB386EVO / BBRight (46mm), BB86 / BB92 (41mm), BSA threaded (34.8mm) or T47 shells.
• FOR YOUR CRANKSET: Works with 24mm Shimano Hollowtech II spindles (105, Ultegra, Dura-Ace, XT, XTR, GRX) and 22/24mm stepped SRAM GXP spindles. Spacer adapter for SRAM GXP spindles are included in the box - no extra parts to buy.
• TOOL REQUIRED (NOT INCLUDED): Installation needs a 16-notch, 44mm outer diameter bottom bracket tool. The thread-together design clamps both cups into one solid unit - this eliminates the creaking noise that press-fit bearings develop, and lets you remove and reinstall it without a bearing press.
• CERAMIC BEARINGS + FULL SEALING: Sealed ceramic bearings for low rolling friction and high-rpm performance, dual O-rings block water and grit, 124g total weight.