Components Bottom brackets Threaded Shimano Tourney BB-UN300 BSA bottom bracket, 73 x 122.5 mm, square

Shimano

Shimano Tourney BB-UN300 BSA bottom bracket, 73 x 122.5 mm, square

Name: Shimano Tourney BB-UN300 BSA bottom bracket, 73 x 122.5 mm, square
Price: 12.59 EUR
Availability: InStock
Rating: 5 (14 reviews)

5/5 (14 ratings)

Availability

12.59 €

RRP 19.99 €

Add to the list Product question

In-store pickup

Tomorrow from 00:00 Check availability

By courier to your home Express courier delivery GLS

Delivery method on Thursday 22.01.2026

At collection points

Delivery method on Thursday 22.01.2026

Extended return option up to 100 days More info

Rating (14)

Show all reviews

5/5

Product description

Shimano Tourney BB-UN300 BSA center composition

Encased square center axis BB-UN300.

Product details

Suitability	MTB
Mount type	BSA
Axis type for crankset	Square
Frame width	73 mm
Dimensions	122.5 mm
Weight	288 g
product ID	109394
EAN

Reviews

Product rating (14 ratings)

5/5

(14 ratings)

(0 ratings)

How do you rate the product?

Add a review

Help others, earn points and shop better prices thanks to the loyalty system

Reviews Verified purchases

Sort by:

Add rating

Product question

Sort by:

Add product question

Warnings and instructions

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. This may cause the product to not operate correctly, and you may fall unexpectedly and be seriously injured.
Before riding the bicycle, check that there are no cracks in the crank arms. If there are any 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.

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.

Contact information