Shimano BB-UN300 Square Taper JIS 73x113mm Spindles BSA (English) Bottom Bracket
Shimano BB-UN300 Square Taper JIS 73x113mm Spindles BSA (English) Bottom Bracket
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Shimano

Shimano BB-UN300 Square Taper JIS 73x113mm Spindles BSA (English) Bottom Bracket

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Clothing Size:BB/Frame Interface: BSA (English), Spindle Interface Type: Square Taper - JIS, Spindle Length: 113, BB/Shell Width: 73 mm

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  • Shimano
  • 192790619217
Current price is Now $18.00
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was $28.98
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Pro Bicycle Assembly

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Sold and shipped by Howler Bike Park
4.228571428571429 stars out of 5, based on 35 seller reviews(4.2)
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Shipping, arrives by Fri, May 29 to Columbus, 43215
Sold and shipped by 365 Cycles
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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?5MYQKJFQDT9K225883427
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?5MYQKJFQDT9K225883427