Best Mountain Bike Bottom Brackets in 2026

14 g lighter than SM-BB6700

smoother than SM-BB6700 (50 % less friction)

small ball bearings keep weight low

Mtb

Hollowtech II

2 items

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

Also fits most other 24mm spindle external mountain BB systems

24mm X-Type

68/73mm wide

【Dimensions and specifications】:OUTER DIAMETER: 1.74 inch/44.5, INNER DIAMETER: 1.28 inch/32.5mm, BALL DIAMETER: 5/16 inch. Please confirm whether this size is suitable for your bicycle before you buy them!!!!!!!!!!!!!!

【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 crank bearing of the bicycle.

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

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.

Material: [cups] aluminum, [bearings] 6806 stainless steel, [inner sleeve] plastic

Shell Type: English threaded (BSA)

Shell Width: 68/73mm

Lightweight to offset weight disadvantage of drivetrain.

Smoother rotation

Better sealing performanceDurable enough for mountain bike usage

Size: 34.5cm x 3.5cm/13.5" x 1.38" (Length can be adjusted between 30 to 40cm )

Fits for 20" 24" 26" tire and 700 road bicycle

Material:Aluminum alloy,Stable stand and durable in use

Suitable for 26 inch mountain bike, seat post diameter less than 34mm.

Easy to adjust angle between the fender and bike tire.

Made of quality PVC.

Fits JIS square-taper cranksets

Crankarm fixing bolts sold separately

Hollow spindle

【Bearing Size】:OUTSIDE DIAMETER: 1.14 inch/29mm, INSIDE DIAMETER: 0.7 inch/18.4mm, BALL SIZE: 1/4 inch x 9 balls.Please confirm the size before purchase!!!!!!!

【Package Include】4 Pieces Bicycle Crank Bearing 1/4" ball size x 9 balls. One pair of crank bearings for replacements, another for spare.

【Widely usage】:This ball bearing retainer for bike parts replacement, suitable for bicycle crank, such as: mountain bike, kids bicycle, lowrider bike,children’s bike, stretch bicycles.

Size: 68x 118mm

Spindle Interface: square taper.

Finish: Phosphated cups anodized sheath

High Quality: Bike Bottom Bracket is 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 Bike Bottom Bracket 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

High Quality: Bike Bottom Bracket is 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

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

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

High Class Quality: Boenoea bottom bracket with steel shell is solid and durable with a long service time, works excellent, the ease of operation, the use safe reliable.

Sealed Bearing Design: Waterproof, dust bearing and maintenance-free sealed cartridge bearing design, which can help to prevent the erosion of sediment water, dirt, mud.

Easy to Install: Two Bearings precision thread design to better connect with the arm of the bike. Help you fast and easy installation without adjustment.

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.

【Functionality Rides High】TRiPEAK steel bearings offer extreme durability and high performance efficiency, specially for off-road rides. Waterproof, dustproof, and efficient BB keeps the wheels rolling for miles and miles before you ever stop.

【Shell Width】Fits 68/73mm English (BSA) bracket shells, interchangeable between SHIMANO BBR-60, BBR-9100, ROTOR BB1 Road, CeramicSpeed BSA, FSA BB-6000 MegaExo and more with significantly less friction.

【Crankset Compatibility】Fits 24mm spindles, 100% compatible with SHIMANO DURA-ACE, TIAGRA, ULTEGRA, GRX, 105 HOLLOWTECH II, FSA MegaExo, ROTOR ALDHU/3D/3D24, RaceFace EXI crankset series, etc.

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

Oversize cartridge bearings

Bike type: mountain

Package Dimensions: 14.732 L x 4.318 H x 7.366 W (centimeters)

Designed for use with Shimano 24mm MTB cranks

Uses high quality sealed bearings

High Performance: The flywheel gaskets are perfect for adjusting your bike bottom bracket, flywheel or hub; Directly replace the old or broken one, and give you a better cycling experience

Durable Material: These bike cassette spacers are made of high-quality aluminum alloy material, good rust and corrosion resistance, sturdy and durable for long service life, no need to replace frequently

Three Different Sizes: There are 3 different sizes of freehub spacers in the pack, 1mm+1.5mm+2mm thickness, convenient for you to choose the appropriate thickness according to your actual requirements

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

Dimensions: The outer diameter is about 1.16 inches / 29.5 mm, the inner diameter is about 0.75 inches / 19 mm, and the ball size is 1/4 inch x 9 balls. Please confirm the size before buying! ! ! ! ! ! !

Material: The ball bearing cage is made of steel material, with high quality, high strength, sturdiness and durability, and can be used for a long time.

Widely used for bicycle parts replacement, suitable for bicycle cranks, such as: mountain bikes, children's bicycles, low riding bicycles, children's bicycles, stretch bicycles.

✅DURABLE MATERIAL - Made of aluminum alloy and stainless steel, with upgraded CNC process, not only durable, but also anti-rust, longer service life.

✅MULTI FUNCTION TOOL - Used for removal and installation of press-fit type bottom brackets such as BB86, BB30, BB91, BB92, etc. In addition, it can disassemble most hollow threaded bottom bracket bearings. A great bicycle maintenance tool for bicycle enthusiasts.

✅EASY TO USE - Very easy to remove and replace the bearings on the bike without damaging them. Suitable bearings for 6805 (25X37X7) Bearing, 6806 (30X42X7) Bearing, Press-In Type BB R92/T86 R30 (BB30 To BB24 Converter)