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Shimano

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

13.99 € savings
RRP 22.99 €
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Rating (23)
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5/5
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more than 200 customers
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Shimano Tourney BB-UN300 BSA center composition

Encased square center axis BB-UN300.
Product details
Specification MTB
Mount type BSA
Axis type for crankset Square
Frame width 73 mm
Dimensions 122.5 mm
Weight 288 g
product ID 109394
Product rating  (23 ratings)
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chimerape chimerape • 2 august 2024 at 15:48
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SK Staré slúžilo skoro 8000km a vymenil som len preto, že som myslel, že je v ňom chyba - ukázalo sa, že nie a tak bude ešte dlho slúžiť.

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2 august 2024 at 15:48
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igorescu igorescu • 23 June 2023 at 9:14
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SK shimano pohon si zasluzi orig. ND, u mna nahradil vyjazdeny FEIMIN FP-B908 a zatial facha tak ako ma

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23 June 2023 at 9:14
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matthewmelo321 matthewmelo321 • 10 June 2026 at 10:31
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SK Oska splnila očakávania je tichá (oproti starej ) jednoduchá montáž do 5 min

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10 June 2026 at 10:31
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martindemo martindemo • 27 october 2022 at 20:05
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SK Na švorhran nedám dopustiť jednoduchý a spoľahlivý.

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27 october 2022 at 20:05
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LovecMartin LovecMartin • 24 september 2025 at 17:22
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SK Zatiaľ fajn. Nutná výmena za starý

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24 september 2025 at 17:22
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hrabypisky hrabypisky • 25 February 2023 at 12:36
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SK Splnila svoj účel, točí sa ako má.

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25 February 2023 at 12:36
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Zlomizub Zlomizub • 25 June 2024 at 13:11
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SK Za 15 eur novy stred Parada.

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25 June 2024 at 13:11
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StepanBastl StepanBastl • 12 March 2026 at 11:34
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SK Tichý a bezproblémový chod.

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12 March 2026 at 11:34
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janjanco41 janjanco41 • 28 october 2023 at 19:36
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SK Funguje dobre.

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28 october 2023 at 19:36
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jeffitoable jeffitoable • 14 september 2022 at 21:50
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SK Zatial dobre

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14 september 2022 at 21:50
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strakuska strakuska • 24 March 2025 at 19:09
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SK kvalitny

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24 March 2025 at 19:09
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mjanek007 mjanek007 • 13 April 2023 at 21:06
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SK .

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13 April 2023 at 21:06
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Pisti0322 Pisti0322 • 4 June 2026 at 20:36
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4 June 2026 at 20:36
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mikloszsoltistvan mikloszsoltistvan • 2 June 2026 at 12:44
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2 June 2026 at 12:44
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szabotibor19750919 szabotibor19750919 • 7 May 2026 at 10:20
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7 May 2026 at 10:20
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robertfilip1010 robertfilip1010 • 16 February 2026 at 22:04
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16 February 2026 at 22:04
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sajdo77 sajdo77 • 13 February 2026 at 19:34
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13 February 2026 at 19:34
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peterantala peterantala • 8 February 2026 at 22:46
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8 February 2026 at 22:46
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joyride joyride • 1 august 2025 at 16:26
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1 august 2025 at 16:26
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RoderikB RoderikB • 28 July 2025 at 12:44
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28 July 2025 at 12:44
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Product questions
janjanco41 janjanco41 • 27 september 2023 at 15:17
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Please give me a replacement for this model. I think it has weak bearings. After a year and about 3000 km of running in, they broke.
The original wheels lasted me 5 years with approximately the same intensity of use. The bearings were more massive, wider.

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27 september 2023 at 15:17
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gronkjear gronkjear Customer support • 1 october 2023 at 20:27 •replyjanjanco41
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SK Dobry den prajem,

jedna sa o pomerne atypicky rozmer, zial ine stredove zlozenie so stvrohrannym systemom uchytenia v rozmere 73x122.5 mm aktualne dsotupne nemame.

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1 october 2023 at 20:27
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comandsk comandsk • 6 February 2025 at 10:06
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Good day, I want to ask if this will fit this bike, Trek Merlin7, the spokes are square and the bottom bracket according to the specification is FSA, 73 mm, threaded cassette, 122.5 mm axle. Thank you for your answer.

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6 February 2025 at 10:06
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jaroslavf jaroslavf Customer support • 6 February 2025 at 12:43 •replycomandsk
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SK Dobrý deň,

Áno pokiaľ je šírka domčeka rámu 73mm a celková dĺžka stredového zloženia 122,5 mm tak tento Shimano stred bude sedieť a môžete ho použiť ako náhradu za FSA.

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6 February 2025 at 12:43
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Farminmansk Farminmansk • 24 February 2022 at 17:32
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Please could you tell me an estimate of when the axle will be available? Thank you

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24 February 2022 at 17:32
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customer-support customer-support Customer support • 24 February 2022 at 17:41 •replyFarminmansk
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SK Dobrý deň,

momentálne žiaľ nemá naš dodávateľ dátum dostupnosti na stránke.

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24 February 2022 at 17:41
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faidron faidron • 19 April 2025 at 13:53
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You can order: FEIMIN FP-B902-8NL –122.5 by 73 mm.

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19 April 2025 at 13:53
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gronkjear gronkjear Customer support • 23 April 2025 at 23:40 •replyfaidron
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SK Dobry den, zial nie, vyrobcu Feimin v portfoliu nemame

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23 April 2025 at 23:40
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lipovsky124 lipovsky124 • 3 september 2024 at 14:18
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Hello, can I replace my old center bearing with this one?

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3 september 2024 at 14:18
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gronkjear gronkjear Customer support • 3 september 2024 at 14:31 •replylipovsky124
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SK Dobry den,

ano, pokial sa jedna o rozmerovo identicke stredove zlozenie, tak ho samozrejme mozete pouzit.

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3 september 2024 at 14:31
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lipovsky124 lipovsky124 • 3 september 2024 at 14:58 •replygronkjear
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SK Môj starý ma rozmery 73 125,5mm tak sa pýtam či mi bude pasovať tonto váš čo má 73 122,5

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3 september 2024 at 14:58
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gronkjear gronkjear Customer support • 4 september 2024 at 14:17 •replylipovsky124
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SK Oska bude kratsia na kazdej strane o 1.5 mm - nebude to tak optimalne, ale pokial mate dost miesta v rame (medzi ramom a klukami), tak nudzovo je mozne stredove zlozenie pouzit.

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4 september 2024 at 14:17
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pavolman pavolman • 22 May 2023 at 16:39
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SK Z čoho sú vyrobené misky? Sú z plastu, alebo z hliníka?

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22 May 2023 at 16:39
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gronkjear gronkjear Customer support • 22 May 2023 at 16:45 •replypavolman
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SK Dobry den,

misky su hlinikove.

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22 May 2023 at 16:45
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slavokover slavokover • 3 April 2026 at 20:51
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SK Zdravim. potrebujem 73x 127,5. viete zohnat ? dakujem

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3 April 2026 at 20:51
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Matniksar Matniksar Customer support • 7 April 2026 at 10:10 •replyslavokover
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SK Dobrý deň,
žiaľ vôbec nie je v ponuke - neviem ho objednať.

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7 April 2026 at 10:10
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Marek94 Marek94 • 17 April 2025 at 22:09
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Hello, are the screws included in the package or do they have to be ordered separately?

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17 April 2025 at 22:09
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gronkjear gronkjear Customer support • 23 April 2025 at 23:42 •replyMarek94
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SK Dobry den prajem,

nie, skrutky nie su sucastou dodavaneho stredoveho zlozenia.

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23 April 2025 at 23:42
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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. 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.

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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