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Shimano

Shimano BB-UN300 bottom bracket, BSA, square taper

Version
12.99 € - 19.99 € savings
RRP 22.99 €
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Rating (13)
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4,8/5
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Shimano UN300 central composition

Encased square central axis BB-UN300 with a length of 113 mm or 118 mm.
Product features
English BSA thread
Supplied without crank clamping screws
Designed for frame width 73 mm
Product details
Specification MTB
Mount type BSA
Axis type for crankset Square
Frame width 73 mm
Dimensions 73 x 113 mm, 73 x 118 mm
Weight 121 g
product ID 108891
Product rating  (13 ratings)
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Reviews verified Verified purchases
laci1900500 laci1900500 • 19 May 2025 at 7:32
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Variant Shimano BB-UN300 stredové zloženie, BSA, štvorhran

SK Pasuje na starsi standard Bezproblemova instalacia Vydrzi dlho

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19 May 2025 at 7:32
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JuroBalko JuroBalko • 5 June 2023 at 9:48
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Variant Shimano BB-UN300 stredové zloženie, BSA, štvorhran

SK Kúpené na mestské približovadlo - niet čo vytknúť.

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5 June 2023 at 9:48
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tl_unicorn tl_unicorn • 31 July 2025 at 15:49
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Variant Shimano BB-UN300 stredové zloženie, BSA, štvorhran

SK Pasuje, funguje, drží. Niet čo dodať.

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31 July 2025 at 15:49
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danny_7 danny_7 • 5 september 2024 at 9:19
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Variant Shimano BB-UN300 stredové zloženie, BSA, štvorhran

SK Zatiaľ v poriadku

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5 september 2024 at 9:19
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birokarol77 birokarol77 • 30 January 2023 at 20:41
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Variant Shimano BB-UN300 stredové zloženie, BSA, štvorhran

SK vyzerá kvalitne

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30 January 2023 at 20:41
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Matejko39 Matejko39 • 18 February 2023 at 23:46
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Variant Shimano BB-UN300 stredové zloženie, BSA, štvorhran

SK Ešte funguje

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18 February 2023 at 23:46
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igorbaluch igorbaluch • 13 April 2026 at 9:04
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Variant Shimano BB-UN300 stredové zloženie, BSA, štvorhran

SK klasika

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13 April 2026 at 9:04
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pmaly1 pmaly1 • 19 March 2021 at 6:40
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Variant Shimano BB-UN300 stredové zloženie, BSA, štvorhran

SK Ok

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19 March 2021 at 6:40
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jurojanosiktn jurojanosiktn • 17 July 2023 at 10:08
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Variant Shimano BB-UN300 stredové zloženie, BSA, štvorhran

SK Funguje ako má. Použil som na rekonštrukciu staršieho bajku od Diamond Back.

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17 July 2023 at 10:08
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dweller dweller • 2 April 2025 at 10:17
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Variant Shimano BB-UN300 stredové zloženie, BSA, štvorhran

SK Lacne riesenie do detskeho bicykla k nahodeniu kratsich 4-hran kluk.

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2 April 2025 at 10:17
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Manager13 Manager13 • Yesterday at 19:25
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Variant Shimano BB-UN300 stredové zloženie, BSA, štvorhran

SK Skvelá náhrada za rozumnú cenu

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Yesterday at 19:25
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kubicamarcom kubicamarcom • 4 June 2026 at 21:24
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Variant Shimano BB-UN300 stredové zloženie, BSA, štvorhran

4 June 2026 at 21:24
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patrik_m patrik_m • 2 december 2025 at 9:44
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Variant Shimano BB-UN300 stredové zloženie, BSA, štvorhran

2 december 2025 at 9:44
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Product questions
lipovsky124 lipovsky124 • 3 september 2024 at 19:53
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Variant Shimano BB-UN300 stredové zloženie, BSA, štvorhran

SK Dobrý deň mohol by som vymeniť staré stredové zloženie o veľkosti 73. 125,5mm za toto

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3 september 2024 at 19:53
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jaroslavf jaroslavf Customer support • 6 september 2024 at 7:36 •replylipovsky124
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SK Dobrý deň,

Ani jeden z týchto rozmerov nebude sedieť, potrebujete osku s dĺžkou 125,5 mm aby bola zachovaná správna reťazová linka. Momentálne však nie je dostupné žiadne stredové zloženie v rozmere 73x125,5 mm.

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6 september 2024 at 7:36
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palo6969 palo6969 • 12 June 2021 at 17:58
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Variant Shimano BB-UN300 stredové zloženie, BSA, štvorhran

SK Stredová os, štvorhran 123mm, 73mm. Nenašiel som, máte?

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12 June 2021 at 17:58
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jaroslavf jaroslavf Customer support • 13 June 2021 at 7:25 •replypalo6969
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SK Dobrý deň,

Tento rozmer som aktuálne nenašiel ani u dodávateľov, momentálne nie je dostupný.

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13 June 2021 at 7:25
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palo6969 palo6969 • 13 June 2021 at 10:24
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Variant Shimano BB-UN300 stredové zloženie, BSA, štvorhran

SK Dik.

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13 June 2021 at 10:24
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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 should always be followed in order to prevent personal injury, 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 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 the crank arms are not cracked. If there are cracks, the crank arm may break and you may fall off the bicycle.
Take care to ensure that parts of your clothing do not get caught in the chain during riding. If they do, you may fall off the bicycle.

CAUTION:
Be careful not to touch the teeth of the sprockets. 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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