Shimano square taper bottom bracket BB-UN300, superb value for money for BSA bottom bracket.

This bottom bracket will give you value for money in good senses - durable and trusted for rugged operations from India to the US; bike makers love this for the price and durability. Shimano launched the BB-UN300 square taper bottom bracket as the successor of the BB-UN26 and BB-UN55. It covers various 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, and the delivery does not include crank bolts.

BB-UN300

SHIMANO - Square Type Bottom Bracket - MTB - Standard Structure

Square Type Bottom Bracket

• SHIMANO quality/performance cartridge bearing square bottom bracket
• Better chain line stability with chain line stabilizer
• 3 structures available
• Standard, E-type, chaincase options
• Adapter Material: Aluminum

Specifications:

• Application: City, Touring, Road, All Mountain, Cross Country
• Type: BSA
• Shell Width: 68 mm
• Spindle: 115 mm
• Axle Type: square taper (JIS)
• E-Type Compatibility: some models (Denoted by "E" in the model name)
• Chaincase Compatibility: some models (Denoted by "K" in the model name)

Technical Information:

• Bearings: Steel
• Axle Material: Steel
• Bottom Bracket Cup Material: aluminum (left), aluminum/steel (right)

Compatibility:

• For all cranks with JIS square mount
• 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

Product Specifications

• MODEL NO: BB-UN300
• SERIES: TOURNEY TX800 Series
• Remarks: * w/ Crank arm fixing bolts spec. Only ** w/ Crank arm fixing bolts spec. is available
• Structure_Standard: ✔
• Axle length/shell width (mm)_D-H_68mm (BC1.37): ✔
• Spindle_Square type: ✔