Shimano

Shimano BB-UN300 Square-Taper Bottom Bracket — BSA 68 x 113mm, JIS, Sealed Cartridge, Universal

The Shimano BB-UN300 is a sealed-cartridge square-taper (JIS) bottom bracket — a dependable, maintenance-free choice for commuter, touring, vintage and entry-level bikes.

Dependable sealed square-taper bottom bracket — genuine Shimano, brand new.

Will it fit? BSA English-threaded, 68mm shell, 113mm spindle, JIS square-taper. For square-taper cranks on BSA 1.37×24 frames. Not for HOLLOWTECH II / 24mm spindle cranks.

Key Specifications

Brand Shimano
Series UN300
Model BB-UN300
MPN BB-UN300
Type Bottom Bracket
Interface Square Taper (JIS)
Thread BSA (1.37×24)
Shell 68mm
Spindle 113mm
Bearings Sealed Cartridge
Weight 280 g (9.9 oz)
Color Silver
Country of Origin Japan
Condition Brand new — original Shimano packaging

Technology Highlights

  • ✓  Sealed cartridge for maintenance-free service.
  • ✓  JIS square taper compatibility.
  • ✓  BSA 68×113mm standard fit.
  • ✓  Durable steel construction.

What's in the Box

  • 1 × Shimano BB-UN300 bottom bracket (68×113mm)
  • Original Shimano packaging
Brand new in retail packaging. Ships from Ontario, California (US domestic) · Estimated delivery 3–5 business days · Free 30-day returns.
$17.95 USD
Regular price
Unit price
per

Pay in 4 interest-free installments of $133.12 with

Shimano BB-UN300 Square-Taper Bottom Bracket — BSA 68 x 113mm, JIS, Sealed Cartridge, Universal
$17.95 USD
Regular price
Unit price
per

Shimano BB-UN300 Square-Taper Bottom Bracket — BSA 68 x 113mm, JIS, Sealed Cartridge, Universal

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