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Shimano BB-UN300 Square Taper BSA Bottom Bracket
Shimano BB-UN300 Square Taper BSA Bottom Bracket
24 reviews
RRP 22,81
17,58
- Delivery in 5-6 working days
- Free tracked shipping over 99,00€
- Trustpilot rating 4.7/5
- Easy returns
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Pros & Cons
Pros & Cons
- This bottom bracket is easy to install yourself.
- The bearings rotate smoothly and have a good durability.
- This bottom bracket is on the heavy side.
Specifications
Specifications
| Brand | Shimano | |
| Types Screw Thread | BSA | |
| Suitable for | Race / MTB | |
| Crankset axle fit | Square Taper | |
| Bottom Bracket Diameter | 33.6-33.9 mm |
This Shimano BB-UN300 bottom bracket is a solid and smooth-running square taper bottom bracket. You can easily mount the matching crank on it and it has a good durability.
High quality and performance
This Shimano BB-UN300 square axle bottom bracket in the Alivio range has a very strong and durable design, allowing you to transfer power to your wheels with as little resistance as possible. The axle is made of steel and the bearings are well sealed. This makes this bottom bracket durable and low-maintenance!
High quality and performance
This Shimano BB-UN300 square axle bottom bracket in the Alivio range has a very strong and durable design, allowing you to transfer power to your wheels with as little resistance as possible. The axle is made of steel and the bearings are well sealed. This makes this bottom bracket durable and low-maintenance!
SHIMANO - bottom bracket square type - MTB - standard structure
Bottom bracket with square axle
High-performance SHIMANO bottom bracket with square axle
Greater chainline stability with chainline stabiliser
3 structures available
Options: stand, E-type, chain guard
Bracket material: aluminium
Bottom bracket with square axle
High-performance SHIMANO bottom bracket with square axle
Greater chainline stability with chainline stabiliser
3 structures available
Options: stand, E-type, chain guard
Bracket material: aluminium
Reviews
Reviews
Most recent reviews
4 / 5
Top product
- Jorgen 27 March 2025
Was able to replace the bottom bracket easily. Be careful when measuring the old bottom bracket though so you order the right one.
Pros & Cons
Already has threadlocker on the threads
Price and quality
Well packaged
Automatic translation
5 / 5
Excellent
- Ivan 4 November 2024
Everything according to the offer
Pros & Cons
Extremely fast delivery
5 / 5
Just an excellent bottom bracket bearing
- Joris 29 September 2024
Quality bottom bracket bearing. Used this on an Alpina children's bike. Much better bottom bracket bearing than was originally on the bike.
Pros & Cons
Affordable
Good quality
Nice finish
Vague manual
Automatic translation
5 / 5
good price/quality
- Arjo van Dalen 6 September 2024
This bottom bracket was easy to install and I like it very much. Good replacement for a worn-out bottom bracket.
Pros & Cons
easy to install
good price/quality
Automatic translation
5 / 5
Fast delivery as always
- M. 6 August 2024
Meets fine for a city bike
Pros & Cons
Does what it needs to do
Special tool needed for installation
Automatic translation
Frequently bought together
Frequently bought together
Recommended by the product specialist
Recommended by the product specialist
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| Shimano BB-UN300 | Sunrace BSA 68/122mm Steel | Gazelle JIS 128mm BB | |
| 24 reviews | 1 review | ||
| Types Screw Thread | BSA | BSA | |
| Suitable for | Race / MTB | ||
| Crankset axle fit | Square Taper | Square Taper | Square Taper |
| Bottom Bracket Width | 68 / 113 mm / 68 / 122 mm / 68 / 127 mm / 68 / 110 mm / 68 / 118 mm / 73 / 113 mm / 73 / 118 mm / 73 / 122 mm | 68 / 122 mm | |
| Bottom Bracket Diameter | 33.6-33.9 mm | 30 mm | |
| - | Yes / No | ||
| 17,58 | 13,43 | 20,69 | |
| This product | View product | View product |