Shimano UN300 Square Taper English Bottom Bracket (Silver) (BSA) (73mm) (113mm)

Read Reviews
Write a Review
Back Order Now
You may back order this item and it will ship when it arrives.
$4.99 flat rate shipping! Learn More
Price: $17.75 (Save 28%)
Sale: $12.79

Please Log in to receive a notification when this item arrives in stock.

Save In List
This item earns up to 13 VIP Reward Points Learn More

Shimano BB-UN300 Square Spindle 73mm Bottom Brackets

Features: 

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

Specifications:
Frame Interface: BSA/English Threaded
Spindle Interface: Square Taper JIS
Bottom Bracket Shell ID: 1.37
Shell Width: 73mm
Spindle Lengths: 113mm, 118mm, 122.5mm
Color: Silver
Weight: TBD

This product was added to our catalog on June 8, 2020

Paul Kirchgessner
Verified Owner
Monday, May 8 2023 (10 months ago)
Shimano UN300 Square Taper English Bottom Bracket (Silver) (BSA) (73mm) (113mm)
Though I had nothing to compare to, the bottom bracket did not seem to rotate as easily or as smoothly as expected upon receipt. The part failed 8 months / 450 miles later. Not sure if it was defective or not suited to more demanding cycling. This replaced the 34 year old Shimano BB on a 1989 Specialized Rock Hopper.