Shimano UN300 Square Taper English Bottom Bracket (Silver) (BSA) (68mm) (113mm)

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Spindle Length:

  • 107mm
  • 110mm
  • 113mm
  • 115mm
  • 118mm
  • 117.5mm
  • 122.5mm
  • 127.5mm
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Shimano BB-UN300 Square Spindle 68mm Bottom Brackets


  • Fits JIS square-taper cranksets
  • Crankarm fixing bolts sold separately
  • Hollow spindle

Frame Interface: BSA/English Threaded
Spindle Interface: Square Taper JIS
Bottom Bracket Shell ID: 1.37
Shell Width: 68mm
Spindle Lengths: 107mm, 110mm, 113mm, 115mm, 117.5mm, 118mm, 122.5mm
Color: Silver
Weight: TBD

This product was added to our catalog on August 11, 2020

Verified Owner
Monday, Jun 14 2021 (11 months ago)
Shimano UN300 Square Taper English Bottom Bracket (Silver) (BSA) (68mm) (122.5mm)
My 2017 Trek FX.2 had +7000 miles on it and was time to replace most of the moving bits. Replaced the bottom bracket with a UN300. The original bracket (VP BC-73) was 68 x 121.5 for JIS square-taper cranks. The UN300 was slightly longer (122.5 vs 121.5 mm) and changed the chain-line, requiring that the front derailleur needed adjusting. All-in-all, the UN300 easily fit into the bicycle frame and appears to be better quality then the original bracket.
Verified Owner
Sunday, Feb 6 2022 (4 months ago)
Shimano UN300 Square Taper English Bottom Bracket (Silver) (BSA) (68mm) (122.5mm)
Arrived fast. Great value and highest quality for entry level/kids bikes and general repair. Nicely sealed on both sides with full aluminum cups. Worth it!