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Shimano

Shimano BB-UN300 bottom bracket, 68x115 mm, BSA, square, MTB

17.79 €
RRP 20.99 €
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Delivery method on Monday 26.01.2026
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Delivery method on Monday 26.01.2026
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Shimano BB-UN300 center composition

Encased square center axis BB-UN300. The package does not include screws for mounting the cranks.
Product details
Suitability MTB
Mount type BSA
Axis type for crankset Square
Frame width 68 mm
Mount method BSA, square
Material steel, plastic
Dimensions 115 mm
product ID 108889
Product rating  (113 ratings)
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WARNING
For assistance with installation, adjustment, and replacement of products 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 environment. 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 environment.

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 the 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 and do not touch the teeth of the sprockets. There is a risk of injury.

Shimano
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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