Shimano BB-UN300 Square Taper BSA Bottom Bracket

Shimano BB-UN300 Square Taper BSA Bottom Bracket
18 reviews
Bottom Bracket Width
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16,95 5,04 discount
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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.
Read more on what our customers have to say about this product

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

Description

Description

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!

Technology

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
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Reviews

Reviews

4.8 / 5
Average from 18 reviews
5
15 reviews
4
2 reviews
3
1 review
2
0 reviews
1
0 reviews

Most recent reviews

4 / 5

Excellent BB, unless you go swimming with it

- Wouter 15 July 2024

Fitted this bottom bracket to my cross bike, an old Giant Terrago gravel conversion. Easy to fit and everything turns wonderfully smooth and quiet. Until I so needed to go through a flooded area in the dunes, with about 40cm of water, many tens of metres long. Within 5 minutes, the BB started creaking and squeaking considerably. Geert from customer service told me that this BB is fine for splashing water and mud and such, but submerging it in water for longer periods is not a good idea. Hollowtech, in turn, works better. In short, fat user fail from me. In the end Mantel was very accommodating with a voucher, and I learned something again.

Pros & Cons

Affordable
Simple
Solid
Not completely waterproof
Automatic translation

5 / 5

Quickly found the product and handled smoothly.

- Coen 6 April 2024

Positive introduction to this shop.

Pros & Cons

Clear we site
Fast processing
Automatic translation

5 / 5

top product

- joost 22 March 2024

japanese quality bearings

Automatic translation

5 / 5

So far, so good!

- Adriaen 10 October 2023

The BB-UN 60 was no longer available, so ordered the 300. Can be transferred 1 to 1 without further modifications.

Pros & Cons

Fits perfectly as a replacement for the BB-UN 60 60.
Automatic translation

5 / 5

Highly recommended for anyone looking for this type of bottom bracket.

- Arnold 10 August 2023

This bottom bracket rotates more lightly than the original one.

Pros & Cons

Easy to assemble with the right tools
On the plus side, this bottom bracket has no downsides.
The bottom bracket rotates lightly
Automatic translation

4

Wouter, 15 July 2024

Excellent BB, unless you go swimming with it

Fitted this bottom bracket to my cross bike, an old Giant Terrago gravel conversion. Easy to fit and everything turns wonderfully smooth and quiet. Until I so needed to go through a flooded area in the dunes, with about 40cm of water, many tens of metres long. Within 5 minutes, the BB started creaking and squeaking considerably. Geert from customer service told me that this BB is fine for splashing water and mud and such, but submerging it in water for longer periods is not a good idea. Hollowtech, in turn, works better. In short, fat user fail from me. In the end Mantel was very accommodating with a voucher, and I learned something again.

  • Affordable
  • Simple
  • Solid
  • Not completely waterproof
Automatic translation

5

Coen, 6 April 2024

Quickly found the product and handled smoothly.

Positive introduction to this shop.

  • Clear we site
  • Fast processing
Automatic translation

5

joost, 22 March 2024

top product

japanese quality bearings

Automatic translation

5

Adriaen, 10 October 2023

So far, so good!

The BB-UN 60 was no longer available, so ordered the 300. Can be transferred 1 to 1 without further modifications.

  • Fits perfectly as a replacement for the BB-UN 60 60.
Automatic translation

5

Arnold, 10 August 2023

Highly recommended for anyone looking for this type of bottom bracket.

This bottom bracket rotates more lightly than the original one.

  • Easy to assemble with the right tools
  • On the plus side, this bottom bracket has no downsides.
  • The bottom bracket rotates lightly
Automatic translation

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18 reviews 0 reviews
Types Screw Thread BSA
Suitable for Race / MTB
Crankset axle fit Square Taper Square Taper
Bottom Bracket Width 68 / 110 mm / 68 / 118 mm / 68 / 113 mm / 68 / 122.5 mm / 68 / 127 mm / 73 / 118 mm / 73 / 122,5 mm / 73 / 113 mm
Bottom Bracket Diameter 33.6-33.9 mm 30 mm
- Yes / No
16,95 19,95
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