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Shimano BB-UN300 Square Taper BSA Bottom Bracket
- Delivery in 4-5 working days
- Free tracked shipping over 99,00€
- Trustpilot rating 4.6/5
- Easy returns
Ask a question about this product
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 |
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!
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
Simple stuff, but so is the price
In daily use, this bottom bracket has lasted a year on me, but at this price, that is to be expected. Easy installation!
Pros & Cons
4 / 5
Nice bottom bracket but does not fit all 80s frames.
because this axle has a wider diameter in the middle than an old axle, the little screw that is on the underside of the frame of the cable guide gets in the way, it sticks in and gets in the way...the axle does not go through the bracket.
5 / 5
Great value for money
I bought this to replace my old Shimano UN52 - beware that UN300 cartridge is slightly thicker so if you have a wire passing onto the cartridge it most likely won’t fit anymore.
Pros & Cons
5 / 5
Very good bottom bracket
Very good bottom bracket
5 / 5
Price quality and fast delivery, what more could you want?
Great quality , will last for years to come. Replaced 25-year-old with this one. With the right tools, you'll have it back in in no time.
Pros & Cons
4
Nice bottom bracket but does not fit all 80s frames.
because this axle has a wider diameter in the middle than an old axle, the little screw that is on the underside of the frame of the cable guide gets in the way, it sticks in and gets in the way...the axle does not go through the bracket.
5
Great value for money
I bought this to replace my old Shimano UN52 - beware that UN300 cartridge is slightly thicker so if you have a wire passing onto the cartridge it most likely won’t fit anymore.
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Compatible with 68mm bottom bracket
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Sturdy
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The left ring is in plastic, weaker than metal
5
Price quality and fast delivery, what more could you want?
Great quality , will last for years to come. Replaced 25-year-old with this one. With the right tools, you'll have it back in in no time.
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Does what it needs to do
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Price / quality is super
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Replaces old 20-year-old Shimano BB
Frequently bought together
Frequently bought together
Recommended by the product specialist
Recommended by the product specialist
Related product
Related product
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| Shimano BB-UN300 | Gazelle JIS 128mm BB | |
| 29 reviews | ||
| Types Screw Thread | BSA | |
| Suitable for | Race / MTB | |
| Size | 68 / 110 mm / 68 / 113 mm / 68 / 118 mm / 68 / 127 mm / 73 / 113 mm / 73 / 118 mm / 73 / 122 mm / 68 / 122 mm | 72 / 128 mm |
| Crankset axle fit | Square Taper | Square Taper |
| Bottom bracket width | 68 mm / 73 mm | 72 mm |
| Bottom bracket diameter | 33.6-33.9 mm | 30 mm |
| 17,23 | 20,28 | |
| This product | View product |