Shimano Bottom Bracket, Square Taper BSA | BB-UN300

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
• Axle Length: 110 mm, 113 mm, 117.5 mm, 122.5 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)_107_68 (BC1.37): ✔
• Axle length/shell width (mm)_LL113_73 (BC1.37): ✔
• Axle length/shell width (mm)_D-H_68 (BC1.37): X *
• Axle length/shell width (mm)_117.5_68 (BC1.37): X **
• Axle length/shell width (mm)_XL118_68 (BC1.37): X **
• Axle length/shell width (mm)_XL118_73 mm: ✔
• Axle length/shell width (mm)_D-NL 122_68 (BC1.37): X **
• Axle length/shell width (mm)_D-NL 122_73 (BC1.37): X *
• Axle length/shell width (mm)_D-EL 127_68 (BC1.37): X *
• Axle length/shell width (mm)_LL123_68 (BC1.37): ✔
• Axle length/shell width (mm)_LL123_73 (BC1.37): ✔
• Axle length/shell width (mm)_LL113_68 (BC1.37): X **
• Axle length/shell width (mm)_MM110_68 (BC1.37): X **
• Spindle_Square type: ✔

SKU#:

• BSA 68x110:
• Threads: BSA
• Shell Width: 68 mm
• Axle Length: 110 mm
• Manufacturer Part Number: EBBUN300B10X
• BSA 68x113:
• Threads: BSA
• Shell Width: 68 mm
• Axle Length: 113 mm
• Manufacturer Part Number: EBBUN300B13X
• BSA 68x117.5:
• Threads: B SA
• Shell Width: 68  mm
• Axle Length: 11 7.5 mm
• Manufacturer Part Number: EBBUN300B17X
• BSA 68x122.5:
  
• Threads: BSA
• Shell  Width: 68 mm
• Axle Length: 122.5 mm
• Manufacturer Part Number: EBBUN300B22X

Package Contents: 1 x Shimano BB-UN300 bottom bracket

SKU#

*Note: Images are for representational purposes only. Actual size/packaging varies with product type/size.

Cycling Boutique Guide on - Shimano Square Taper Bottom Bracket Codes: 

eg. EBBUN300B07X, EBBUN300KB23XW etc.

• B = Normal Bottom Bracket
• E = For Ebikes or similar
• K = For chain case (bicycles with a chain guard) 

• X = W/O FIXING BOLT
• B = W FIXING BOLT
• W = W/ 0.7MM SPACER

Shimano Square Taper Bottom Bracket spindles are denoted by letter codes corresponding to matching length spindles. The followings are the codes and the matching spindle lengths:

Code Length

• MM 107mm and 110.5mm
• LL 113mm
• D-H 115mm
• YL 116mm
• XL 118mm
• ZL 121mm
• NL 122.5mm
• EL 127.5mm

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When buying Shimano bicycle components in India, be assured that Cycling Boutique is the go-to place with 100% original, genuine Shimano components with trustable authenticity and trust. Our friendly technical support staff will be able to address any of your technical issues - be it a silly-looking beginner question to the most challenging solvable mechanical bicycle problems.