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Greetings! The 2023 season is poppin! Marin, Fuji and Breezer are in full stock! Click below to set up an appointment for repairs, tune-ups or any other bike servicing you may need. Our June 2023 hours are: M-F 11-6, SAT 10-6. Closed Sunday. Questions? E-mail us at or text/call us at 510-328-1158.

BOX One Bottom Bracket Square-Taper Titanium/Carbon

BOX One Bottom Bracket Square-Taper Titanium/Carbon
Square Taper
Please select options


With precision sealed bearings and cold-forged, aluminum CNC machined cups, the Box One™ Titanium Square Taper bottom brackets are the best option for young BMX racers and other users. It is a three-piece crank in search of performance gains and weight savings. They have hollow, custom titanium-nitride-coated titanium spindles and carbon fiber center seals, helping keep the weight down between 185 and 190 grams (well below that of other square taper bottom brackets on the market). Other features include cups that are anodized black with anodized gold inner seals and a JIS tapered spindle that comes in either 108 or 113 millimeters.

Weight Limit: 115kg (253 lbs) with limitations as per Category 2 of EN 16054:2012 Standard

- Precision Abec-5 Sealed Bearings
- Lightweight Non-Structural Carbon Components
- Extra Rigid Titanium Spindle

- Box Five Square Taper Crankset

Process: CNC-Machined Cups
- Spindle: Titanium
- Cups: Alloy
- Sleeve: Carbon Fiber
Finish: Titanium Nitride Coated
Spindle Type: JIS Square Taper
Spindle Length: 108mm or 113mm
Shell Width: 68mm
Thread: 1.37" x 24 TPI
Compatibility: BSA Threaded
Weight [108-113] (+/- 5%): 199-204 g / 7-7.2 oz

Part Numbers

Option UPC MPN
Gold / 108mm / English / Square Taper / 68mm 639266089346 BX-BB13TI108-GD
Gold / 113mm / English / Square Taper / 68mm 639266089353 BX-BB13TI113-GD