Components Bottom brackets Threaded Shimano BB-UN300 bottom bracket, BSA, 68x122.5 mm, square

Shimano

Shimano BB-UN300 bottom bracket, BSA, 68x122.5 mm, square

Name: Shimano BB-UN300 bottom bracket, BSA, 68x122.5 mm, square
Price: 12.29 EUR
Availability: InStock
Rating: 4.8 (13 reviews)

4.77/5 (13 ratings)

Availability

12.29 €

RRP 19.99 €

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Delivery method on Thursday 22.01.2026

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Delivery method on Thursday 22.01.2026

Extended return option up to 100 days More info

Rating (13)

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4,8/5

Product description

Shimano BB-UN300 center composition

Encased square center axis BB-UN300.

Product details

Suitability	MTB
Mount type	BSA
Axis type for crankset	Square
Frame width	68 mm
Dimensions	123 mm
Weight	285 g
product ID	109393
EAN

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Product rating (13 ratings)

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Warnings and instructions

WARNING
For information about installing, adjusting, and replacing products that are not found in the user's manual, please consult the place of purchase or a distributor. A dealer's manual intended for professional and experienced bicycle mechanics is available on our website (https://si.shimano.com).
For safety, be sure to carefully read this "user's manual" before use, follow it for correct use, and save it so that you can refer back to it at any time.
The following instructions must always be followed in order to prevent personal injury and physical damage to equipment and the surroundings. The instructions are classified according to the degree of danger or damage that may occur if the product is used incorrectly.
DANGER - Failure to follow the instructions will result in death or serious injury.
WARNING - Failure to follow the instructions could result in death or serious injury.
CAUTION - Failure to follow the instructions could result in personal injury or physical damage to equipment and the surroundings.

WARNING:
Do not disassemble or modify the product. This may cause the product to malfunction, you may fall unexpectedly and be seriously injured.
Before riding your bicycle, check that the crank arms are not cracked. If there are cracks, the crank arm may break and you may fall off the bicycle.
Be careful not to get parts of your clothing caught in the chain while riding. Otherwise, you may fall off the bicycle.

CAUTION:
Be careful not to touch the teeth of the sprockets. There is a risk of injury.

Threaded Shimano

Japanese manufacturer produces road, mountain, gravel, trekking, BMX and e-bike groupsets. They also offer a whole series of components and apparel. Their range goes from wheels, footwear, eyewear to backpacks. Shimano is a traditional manufacturer known for their quality work, which is why they are the favourite choice of amateurs and professionals.

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