Best Bike Drivetrain Bottom Brackets in 2026

14 g lighter than SM-BB6700

smoother than SM-BB6700 (50 % less friction)

small ball bearings keep weight low

Mountain Bike Bottom Bracket - Connect your crankarms and protect the smooth, long-lasting application of power to your drivetrain.

Oversized Dub Spindle - Works across every bottom bracket standard for greater bearing durability.

Improved Riding - Better crankarm compatibility, better protection from the elements.

Material: [cups] aluminum

Shell Width: [English] 68 mm, [Italian] 70 mm

Threading: English, Italian

Fits JIS square-taper cranksets

Crankarm fixing bolts sold separately

Hollow spindle

072774209590

Bearings & cups for one-piece cranks

68mm bottom bracket shell width compatible

24 TPI Treads

High class quality and very durable, brand new and well packed.

Fit for BB-UN26 68*123, 68*127, 68*110mm Square Taper Bottom Bracket.

Interface: Square Taper, Shell Size: 68 millimeter, Bearings: Steel.

Available Colors: Chrome, Black, Gold

Available Sizes: 5/16 x 7, 5/16 x 9

Sold as Set of 9 Pieces

Fits JIS square-taper cranksets

【Application:】: This kind of ball bearing stainless steel ball inlaid in the retainer design,It is a bicycle parts, it's suitable for replacing the front wheel's bearing of the bicycle.

【Dimensions and specifications】: OUTER DIAMETER: 0.8 inch, INNER DIAMETER: 0.5 inch, BALL DIAMETER: 3/16 inch. Please confirm whether this size is suitable for your bicycle before you buy them!!!!!!!!!!!!!!!!!!

【Material】: This ball bearing retainer made of steel, high quality, durable and high intensity.

Lightweight to offset weight disadvantage of drivetrain.

Smoother rotation

Better sealing performanceDurable enough for mountain bike usage

High Quality-The bottom bracket is made of stainless steel, solid with a long service time. Light weight, no additional burden.

compatible with Size-Suitable for 80/100mm frame shell. Cups thread size and pitch 34.798mm 1.37 * 24TPI.Please use the BB tool to install and replace the bottom bracket for safety.

Integrated System-Integrated system can protect the frame, more power output, it's better than ordinary structure bottom bracket. With two screws, easy to install.

Fit for BB-UN26 68*123, 68*127, 68*110mm Square Taper Bottom Bracket.

Interface: Square Taper, Shell Size: 68 mm, Bearings: Steel.

Package Includes 1pcs Square Taper Bottom Bracket.

Size: 110.5mm/113mm/116mm/118mm/120mm/122.5mm/124.5mm/126mm

Sealed cartridge bearing assembly, suitable for 68mm frame shell

BSA integrated design, higher performance

CONVENIENT&SIMPLE:You can use the wrench to remove and install ZTTO BB91/BB109/BB30SH/PF30SH/BB86 30/BB30 30 smoothly.

SAVE ENERGY:It's long enough to give you adequate leverage for installing the cups with the force you need.

PRECISION FIT GEAR:The precisely shaped metal teeth of the wrench won't damage the teeth on your BB cups.

Thread: BC1.37 x 24T English Shaft Steel.

Bike Bottom Bracket Model: BC-73.

Size: 68 mm x 118mm.

High Quality: Made of Aluminum Alloy & PP, this bottom bracket is solid and durable with a long srvice time

Separate Design: The separate rubber gasket with bilateral sliding characteristic, won't inrease the resistance to roration axis

Fitment: This accssory is applicable for Integrative Crankset, Prowheel, FSA Integrative Crankset, Sunrace, and SRAM Hollow Crankset( with gasket ring ), whose diameter of the cylinder is about 24mm

Aluminum sheath,cold-forged steel cups, Boron Axel/spindle, Sealed bearings

Finish: Phosphated cups anodized sheath

For bike type: mountain bike, road racing bike etc. Spindle Interface: square taper.

【Material】: Made of pure iron,sturdy and not easily deformed.

【Fits】：Compatible with Shimano (incl. BB80, BB5700, XT BB70, BB51), Campagnolo, SRAM/Truvativ GXP, Chris King, FSA MegaExo, Hope, Race Face X-type, Surly, Wheels Mfg, Fulcrum.

【Function】: Used to remove and install external bearing crankset bottom brackets.It features a 3/8" drive fitting and 1" wrench flats, allowing the tool to be driven using a wrench, socket, or 3/8" drive torque wrench.

Spacer used to adapt 22 /24 mm spindle (GXP standard) to press-fit BB86 / BB92 / PF41 / PF 24 and BSA threaded bottom bracket with 24mm ID (Shimano standard)

Made of aluminum alloy

Weight: 2.1g

【Solid and sturdy】The bicycle bottom bracke is solid and sturdy, withstand long time using.

【For bracket bottom】 The steel shell can absorb roundness tolerance for installing ports of bracket bottom.

【Integrated system】Integrated system can protect the frame, more power output, it's better than ordinary structure bottom bracket, a must have cycling accessory.

BETTER SYSTEM: Integrated system can protect the frame, giving more power output, better than ordinary structure bottom bracket.

TOP QUALITY: Square Taper Bottom Bracket is solid and durable with high quality material, which can use for a long time.

SUIT FOR: roundness tolerance can be absorbed by the steel shell of installing ports of Bracket Bottom, suitable for 80/100mm frame shell.

Good performance -- Effective waterproofness, the separable rubber gasket can withstand the sliding spacing, resulting in a gapless movement, preventing dust and moisture from bearing, and has good waterproofness.

No lubrication resistance -- There is no resistance to lubrication, the separable rubber gasket has the characteristics of double‑side sliding, which will not increase the resistance to the rotation bearing, and the lubrication is high.

Stable groove sealing -- Groove sealing is strong, and the newly designed end cover greatly improves the sealing performance of the drainage, while reducing the sealing resistance, and the appearance is more high‑end.

LONG TERM USE: The Bicycle Bottom Bracket is made with good materials, which is solid and durable with a long service time.

GREAT WORKMANSHIP: With good performance, bearing structure, the degree of lubrication is quite good, and the steel shell can absorb roundness tolerance for installing ports of Bracket Bottom.

NICE SYSTEM: Integrated System can protect the frame to provide more power output, which makes the Bottom Bracket working more effective.​

Ball: 9; Ball diameter: 1/4 inch; Outer diameter: 1.14 inch / 29mm; Inner diameter: 0.7 inch /18mm

This ball-bearing retainer with 9 balls is suitable for the bottom bracket of the bicycle. It is an ideal substitute for your bicycle.

Material: steel ball bearing cage, strong and durable, high strength.

1. Size compatible: BC 1.37"x24T, ø24mm spindle, suitable for 68-73mm bottom bracket MTB, road bike ➤68mm (road bike bottom bracket) add 1 washer to the right ➤68mm (mountain bike bottom bracket) add 2 washers on the right and 1 washer on the left ➤73 mm(mountain bike bottom bracket) add 1 washer on the right

2. High-quality material: The bicycle bottom bracket is made of high-strength aluminum alloy and PP5 material, CNC machining process, strong and durable while keeping the weight light

3. Thread lock design: Two-way thread lock design is adopted to enhance lateral stability, not easy to loosen, and at the same time reject abnormal noise

【Excellent quality】The bottom bracket is solid and durable with a long service time.

【Excellent function】The steel shell can absorb roundness tolerance for installing ports of Bracket Bottom.

【Excellent performance】Integrated System can protect the frame, more power output, it's better than ordinary structure bottom bracket.

The BB washers are made of aluminum alloy to assure durability, heat resistance, oil resistance, and corrosion resistance.

Can be applied to BB axle. The package contains 5 pieces O shape washers, measured in 1mm 2mm and 3mm thickness, with 3 inner diameters to choose, please choose the inner diameter you need.

Bicycle bottom bracket washer is lightweight and easy to carry due to the small size. You can put the bicycle bottom bracket washer in your backpack just in case. After adding the washer, you will find that it can be locked by your flywheel cover to achieve shifting.

【Brand New】：100% brand new and high quality. Made of high quality material, durable and practical to use.

【Suitable Bike】：3S/3T/3P/5S different size for mountain bikes.

【Size】：5S whole length: 14.8cm, 3S whole length: 14.5cm, 3P whole length: 14cm, 3T whole length: 14cm.

Fit for 68x110mm Square Taper Bottom Bracket.

Interface: Square Taper, Shell Size: 68 millimeter, Bearings: Steel.

Top quality: The square cone bottom bracket is made of high-quality materials, sturdy and durable, and can be used for a long time.