Shimano BB-UN300 Square Taper JIS 68x110mm Spindles BSA (English) Bottom Bracket
Shimano BB-UN300 Square Taper JIS 68x110mm Spindles BSA (English) Bottom Bracket
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Shimano

Shimano BB-UN300 Square Taper JIS 68x110mm Spindles BSA (English) Bottom Bracket

|5 ratings
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Clothing Size:BB/Frame Interface: BSA (English), Spindle Interface Type: Square Taper - JIS, Spindle Length: 110, BB/Shell Width: 86 mm

Key item features

  • Fits JIS square-taper cranksets
  • Crankarm fixing bolts sold separately
  • Hollow spindle
  • 37BB/Frame InterfaceEnglishBB Shell Width (mm)68Spindle Interface TypeSquare Taper JISSpindle Length110Defined ColorBlack
Current price is Now $19.48
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was $28.61
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Sold and shipped by Bell's Bike Shop
4.54179104477612 stars out of 5, based on 670 seller reviews(4.5)
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4.4 out of 5 stars
stars5 ratings2 reviews
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Showing 1-2 of 2 reviews

Sep 16, 2025
johnflatfoot
Item details
Clothing size: BB/Frame Interface: BSA (English), Spindle Interface Type: Square Taper - JIS, Spindle Length: 122.5, BB/Shell Width: 86 mm
Sold and shipped by365 Cycles
4 out of 5 stars review

Verified Purchase

not like the old ones!

so had to buy this for a new crankset and my original one was 30 years old so time to replace anyway. the old one was heavy steel except the bracket on the chain side which was plastic. this fit the threads very snugly, I had to use a wire wheel to clean the threads of rust and debris for this to fit correctly. the motion is very smooth, haven't had a chance to use it for real yet. hopefully it will last, somewhat concerned about the aluminum corroding with the bike frame due to galvanic action

Helpful?5MYQKJFQDT9K719219058
Mar 7, 2026
Erik
Item details
Clothing size: BB/Frame Interface: BSA (English), Spindle Interface Type: Square Taper - JIS, Spindle Length: 113, BB/Shell Width: 86 mm
Sold and shipped byHowler Bike Park
4 out of 5 stars review

Verified Purchase

Works good and easy to install

Helpful?5MYQKJFQDT9K719219058