Shimano square taper bottom bracket BB-UN300 - different axle lengths, for BSA bottom bracket

The BB-UN300 square taper bottom bracket was launched by Shimano as successor of the models BB-UN26 and BB-UN55. It covers a wide range of applications, from Touring and City bikes to older Road and Mountain bikes. BB-UN300 is available with BSA thread and in different axle lengths. In this type, the bottom bracket axle and crank are connected by a square taper. The delivery does not include crank bolts.

Specifications:

Application:

City, Touring, Road, All Mountain, Cross Country

Type:

BSA

Shell Width:

68 mm

Axle Length:

110 mm, 113 mm, 117.5 mm, 122.5 mm

Axle Type:

square taper (JIS)

E-Type Compatibility:

no

Chaincase Compatibility:

no

Technical Information:

Bearings:

steel

Axle Material:

steel

Bottom Bracket Cup Material:

aluminium (left), aluminium / steel (right)

Compatibility:

• for all cranks with JIS square mount

Recommended for:

• FC-M311, FC-M315, FC-M351, FC-M361, FC-M371, FC-M430
• FC-M2000, FC-M3000
• FC-T3010
• FC-MT100
• FC-RS200
• FC-TY301, FC-TY501, FC-TY701
• FC-TX801
• FC-A070, FC-A073
• FC-U4000

Models:

BSA 68x110:

Threads:

BSA

Shell Width:

68 mm

Axle Length:

110 mm

Manufacturer Number:

E-BBUN300B10X

BSA 68x113:

Threads:

BSA

Shell Width:

68 mm

Axle Length:

113 mm

Manufacturer Number:

E-BBUN300B13X

BSA 68x117.5:

Threads:

BSA

Shell Width:

68 mm

Axle Length:

117.5 mm

Manufacturer Number:

E-BBUN300B17X

BSA 68x122.5:

Threads:

BSA

Shell Width:

68 mm

Axle Length:

122.5 mm

Manufacturer Number:

E-BBUN300B22X

Contents:

• 1 x Shimano BB-UN300 bottom bracket