Cost effective replacement
"Shimano square taper bottom brackets just work. Easy to install with the spike tool. Just remember to grease or use never seize when installing into a steel frame, as the metals will fuse together."
Description
Shimano BB-UN300 Square Spindle Bottom Brackets
- Fits JIS square-taper cranksets
- Crankarm fixing bolts sold separately
- Hollow spindle
Specifications
These are the specifications for Item ID: CR3484
| Spindle interface type: | Square Taper JIS |
| Bottom bracket shell id: | 1.37 |
| Spindle length: | 113 |
Shimano
Shimano BB-UN300 Bottom Bracket - English, 68 x 113mm Spindle, Square Taper JIS
Shimano BB-UN300 Bottom Bracket - English, 68 x 113mm Spindle, Square Taper JIS
Regular price
$18.00
Regular price
$18.00
Sale price
$18.00
Unit price
per
Item ID: CR3484
In stock - Ready to ship.
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Overall rating: 4.883721 / 5 from 43 reviews.
AI Generated Review Summary
Summary topics
Review topics: [fit, size, quality, price, shipping, looks, replacement, bottom bracket, bearings, buy, bracket].
Review highlights
Reviews
Works great. Spins around and
"Works great. Spins around and around!"
I love a square tapered
"I love a square tapered bb just like the next rivendell riding retrogrouch, but we all can agree; they’re a total guessing game when it comes to which length you need. There’s only so much sheldon brown you can read before you just take an educated guess and bite the bullet and buy the length you think you need. Well enter the un300, they’re cheap and work great! Definitely punches above it’s weight class. The best part, if you get the wrong size, it’s not the end of the world and now you have a spare bb sitting around for the next time you try to 1x your 90s xtr crank and are wondering which length you need. I have several of these kicking around in various lengths for that specific purpose. Did I also mention they work great? They work well enough that I run them even if I have some fancy sugino 75s or the paul square tapered cranks. If you feel inclined to be fancy and get a phil wood or white industries, now you know which length to get and it only cost ~$15 instead of $100"
Perfect fit in my Trek
"Perfect fit in my Trek bike. I wanted 150 mm cranks and the only ones I could find were square taper. This bracket works perfectly."
Old school bottom bracket: English
"Old school bottom bracket: English threaded, lots of options. I bought this to accommodate a Stronglight triple crankset to mount on a 1970’s Witcomb frame with a 68mm bb. It fits well but it’s a bit wide for proper chain line, so I’ll probably step down to the next to largest size."
Silky smooth BB. Can't beat
"Silky smooth BB. Can't beat this quality at this price."
Solid BB
"Solid BB! The cups are not the same dimensions as the UN55, so you need to use the actual cup provided. I wish the cup were plastic, but that is the minority position - I have a frame with sketchy bb threads. Other than that, just as good as the UN55 (RIP in peace)"
As good as it needs to be
"Not the lightest or fanciest, but just as reliable as much more expensive Bottom Brackets"
Good quality product...
"Quality made Shimano Bottom Bracket 👌 And great price from Cambriabike.com!"
Happy to have bought this
"Happy to have bought this. Always trust the products I get from Cambria."