Shimano Bottom Bracket, Square Taper BSA | Tourney TX800 Series, BB-UN100 - Cycling Boutique
  • SKU: CB4706

Shimano Bottom Bracket, Square Taper BSA | BB-UN100

Rs. 790.00
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Shimano square taper bottom bracket BB-UN100, superb value for money for BSA bottom bracket

This bottom bracket will give you the 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. The BB-UN100 square taper bottom bracket was launched by Shimano as the 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-UN100 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.



SHIMANO - Cartridge Bottom Bracket - MTB - Standard Structure

For square taper cranks, the SHIMANO UN100 bottom bracket offers superior quality and reliability at a great value.

  • Quick and precise assembly
  • Superior quality and reliability at a great value
  • Cost competitive construction while maintaining SHIMANO quality and performance
  • Square type

  • 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)

  • 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

Contents: 1 x Shimano BB-UN100 bottom bracket

Product Specifications
  • MODEL NO: BB-UN100
  • SERIES: TOURNEY TX800 Series
  • Remarks: * w/ Crank arm fixing bolts spec. available
  • Structure_Standard: ✔
  • Axle length/shell width (mm)_D-NL 122_68 (BC1.37): X*
  • Axle length/shell width (mm)_LL123_68 (BC1.37): ✔
  • Axle length/shell width (mm)_LL123_73 (BC1.37): ✔
  • Spindle_Square type: ✔

MPN BB Interface BB Shell Interface Spindle Interface BB Shell Diameter BB Shell Width Spindle Length (mm) Material Color
EBBUN100B22X BSA Threaded Square Taper 1.375" x 24tpi 68mm 122.5 Steel Black
EBBUN100KB22X BSA Threaded Square Taper 1.375" x 24tpi 68mm 123 Steel Black
EBBUN100B23X BSA Threaded Square Taper 1.375" x 24tpi 68mm 123 Steel Black
EBBUN100KB23X BSA Threaded Square Taper 1.375" x 24tpi 68mm 123 Steel Black
EBBUN100C23X BSA Threaded Square Taper 1.375" x 24tpi 73mm 122.5 Steel Black

*The versions with "K" in it, for eg: BB-UN100-K SHIMANO TOURNEY TY - Cartridge Bottom Bracket - MTB - denotes the BB meant to be used for Chain Case

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) 
  • W = W/ 0.7MM SPACER

Shimano Square Taper Bottom Bracket spindles are denoted by letter codes that correspond to matching length spindles. The following 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


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

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