Square-Taper Bottom Brackets

The square taper bottom bracket is the traditional "cotterless" bottom bracket. Now sold as sealed cartridge units, they're economical and reliable.

Shimano BB-UN26 68 x 110mm

81211
!
Sealed cartridge bottom bracket at a surprisingly low price.

For 68mm bottom bracket shell. English threads. Supplied without crank bolts - you'll need to reuse your old ones. Weight (117mm axle length): 325g. Shipping Weight: 350g.

Shimano BB-UN26 68 x 110mm E-Type

2399
!
Sealed cartridge bottom bracket at a surprisingly low price.

For 68mm bottom bracket shell and a bottom bracket mounted front derailleur. English threads. Supplied without crank bolts - you'll need to reuse your old ones. Weight (117mm axle length): 325g. Shipping Weight: 350g.

Shimano BB-UN26 68 x 113mm

2827
!
Sealed cartridge bottom bracket at a surprisingly low price.

For 68mm bottom bracket shell. English threads. Supplied without crank bolts - you'll need to reuse your old ones. Weight (117mm axle length): 325g. Shipping Weight: 350g.

Shimano BB-UN26 68 x 117mm

2556
!
Sealed cartridge bottom bracket at a surprisingly low price.

For 68mm bottom bracket shell. English threads. Supplied without crank bolts - you'll need to reuse your old ones. Weight (117mm axle length): 325g. Shipping Weight: 350g.

Shimano BB-UN26 68 x 117mm E-Type

2400
!
Sealed cartridge bottom bracket at a surprisingly low price.

For 68mm bottom bracket shell and a bottom bracket mounted front derailleur. English threads. Supplied without crank bolts - you'll need to reuse your old ones. Weight (117mm axle length): 325g. Shipping Weight: 350g.

Shimano BB-UN26 68 x 122mm

2582
!
Sealed cartridge bottom bracket at a surprisingly low price.

For 68mm bottom bracket shell. English threads. Supplied without crank bolts - you'll need to reuse your old ones. Weight (117mm axle length): 325g. Shipping Weight: 350g.

Shimano BB-UN26 68 x 123mm

2494
!
Sealed cartridge bottom bracket at a surprisingly low price.

For 68mm bottom bracket shell. English threads. Supplied without crank bolts - you'll need to reuse your old ones. Weight (117mm axle length): 325g. Shipping Weight: 350g.

Shimano BB-UN26 73 x 110mm

2373
!
Sealed cartridge bottom bracket at a surprisingly low price.

For 73mm bottom bracket shell. English threads. Supplied without crank bolts - you'll need to reuse your old ones. Weight (117mm axle length): 325g. Shipping Weight: 350g.

Shimano BB-UN26 73 x 113mm

2374
!
Sealed cartridge bottom bracket at a surprisingly low price.

For 73mm bottom bracket shell. English threads. Supplied without crank bolts - you'll need to reuse your old ones. Weight (117mm axle length): 325g. Shipping Weight: 350g.

Shimano BB-UN55 68 x 110mm

1013
!
Square taper bottom bracket with top quality bearings.

For 68mm bottom bracket shell. Axle Length: 110mm. English threads. Crank bolts NOT included (so keep your old ones).

Shipping Weight: 360g.

Shimano BB-UN55 68 x 113mm

90395
!
Square taper bottom bracket with top quality bearings.

For 68mm wide bottom bracket shell. English threads. Crank bolts NOT included (so keep your old ones). Axle protrusion from frame: Right Side 22.5mm, Left Side 23.5mm (Axle measures at 114mm). Weight: 295g. Shipping Weight: 358g.

Shimano BB-UN55 68 x 115mm

1222
!
Square taper bottom bracket with top quality bearings.

For 68mm bottom bracket shell. Axle Length: 115mm. English threads. Crank bolts NOT included (so keep your old ones).

Shipping Weight: 360g.

Shimano BB-UN55 68 x 118mm

1077
!
Square taper bottom bracket with top quality bearings.

For 68mm bottom bracket shell. Axle Length: 118mm. English threads. Crank bolts NOT included (so keep your old ones).

Shipping Weight: 360g.

Shimano BB-UN55 68 x 122mm

90619
!
Square taper bottom bracket with top quality bearings.

For 68mm bottom bracket shell. English threads. Crank bolts NOT included (so keep your old ones). Shipping Weight: 360g.

Shimano BB-UN55 68 x 127mm

90780
!
Square taper bottom bracket with top quality bearings.
For 68mm bottom bracket shell. English threads. Crank bolts NOT included (so keep your old ones). Shipping Weight: 360g.

Shimano BB-UN55 73 x 122mm

90309
!
Square taper bottom bracket with top quality bearings.

For 73mm wide bottom bracket shell. English threads. Crank bolts included (14mm head, not allen type). Axle protrusion from frame: Right Side 25.5mm, Left Side 24.5mm. (Axle measures at 123mm). Shipping Weight: 407g.

Shimano BB-UN55 Italian 70 x 110

1354
!
To fit bike with Italian bottom brackets (70mm width and right hand threads on both sides). If you wish to convert your classic Italian roadster to compact chainrings, this bottom bracket is the match to the economical Shimano FC-A070 Cranks.
Crank bolts NOT included (so keep your old ones, or use the ones supplied with new cranks). Shipping Weight: 360g.