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Shimano

Shimano BB-UN300 bottom bracket, 68x127 mm, BSA, square taper, MTB

13.90 € savings
RRP 20.99 €
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Delivery method on Thursday 22.01.2026
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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
Material steel, plastic
Weight 327 g
Mount method BSA, square
Dimensions 68 x 127 mm
product ID 111847
Product rating  (113 ratings)
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WARNING
For information on installation, adjustment and replacement of the products which are not found in the user's manual, please consult the place of purchase or a distributor. A dealer's manual for professional and experienced bicycle mechanics is available on our website (https://si.shimano.com).
For safety, be sure to read this "user's manual" thoroughly before use, follow it for correct use, and save it so that you can refer back to it at any time.
The following instructions should 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 which 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 surroundings.

WARNING:
Do not disassemble or modify the product. It may cause the product to not operate correctly, and 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 allow parts of your clothing to get caught in the chain during riding. If you do, you may fall off the bicycle.

CAUTION:
Be careful not to touch the gear teeth. There is a danger 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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