BSA English Threaded for 30mm MTB spindles Ultra-lite Bottom Bracket


Size Guide
Integrated Spindle Protector

  • The BBInfinite Ultra-Lite MTB Threaded BB System works with any long-pattern 30mm spindle mountain bike crank set on the market such as any Sram MTB crank, Rotor REX, and all the RaceFace Cinch cranks, just to name a few.

    NOTE: WILL NOT work with any BB30-only cranks with short spindles, such as the Cannondale Si Hollowgram.

    Weighing in at a skimpy 71 grams for the set, the BBInfinite Ultra-lite bottom bracket system delivers smooth, quiet, durable performance in an ultra compact form factor that allows maximum clearance for power meter back plates. Installs with common socket-style, 16-notch tools such as the classic Shimano TL-FC33, Park Tools BBT-69.2, and many others like our own right here. Do not use open end wrench-style tools because they will slip and mar the finish, and let's face it, that ain't pro.


    Q: Why is there an Integrated Spindle Protector option? A: Some frames have extremely restrictive bottom bracket shells that get so narrow in the middle that there is barely clearance for a 29mm or 30mm spindle. A frame of this type will NOT admit our integrated spindle protector. If the frame is wide open inside, chose the "With" option. If your frame narrows inside, chose the "Without" option.

    ATTENTION: Always "chase and face" your frame bottom bracket shell before installation. Threads must be absolutely clean and clear of debris. Frame bottom bracket shell must be faced to the proper spec for that frame, for instance, a 73mm shell should measure exactly 73mm after facing. If it is at spec, do not face it more. In this case simply chase the threads, clean, and install according to instructions.

  • Technical Specifications


    WS2: 71g | CERAMITECH: 73g | ABEC-7 SS: 76g

    Frame Width: BSA 73mm English

    Frame Diameter: 1.37 x 24tpi English

    Spindle Diameter: 30mm

    Bearing Size: 4030

    Ceramitech 4030 | ABEC-7 4030

  • Spacers Stack for BENG-PF-MT

    BENG-PF-MT MTB Crank Spacer Chart

    Crank Length(mm) Spacer SKU
    110.75 -
    116.25 Spacer-2.5MM-SET
    118.25 Spacer-2.5mm-5.25mm-SET

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Bottom Bracket Selection Guide