Shimano Square Type Bicycle Bottom Bracket - BSA 73Mm, Spindle: 122.5Mm (Ll123) - Ebbun300C23X | bottom-bike-brackets-and-accessories
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Shimano Square Type Bicycle Bottom Bracket - BSA 73Mm, Spindle: 122.5Mm (Ll123) - Ebbun300C23X | bottom-bike-brackets-and-accessories
Shimano BB-UN300 Square Spindle Bottom Brackets are designed to fit JIS square-taper cranksets and feature a hollow spindle.
Shimano Square Type Bicycle Bottom Bracket - BSA 73Mm, Spindle: 122.5Mm (Ll123) - Ebbun300C23X | bottom-bike-brackets-and-accessories
Numéro d'article: 48375664

Shimano Square Type Bicycle Bottom Bracket - BSA 73Mm, Spindle: 122.5Mm (Ll123) - Ebbun300C23X | bottom-bike-brackets-and-accessories

88% des répondants recommanderaient ceci à un ami

Numéro d'article: 48375664

€ 25

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Shimano BB-UN300 Square Spindle Bottom Brackets are designed to fit JIS square-taper cranksets and feature a hollow spindle.
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Ce qui se démarque

Durable Construction
Crafted for longevity, the Shimano BB-UN300 uses high-quality materials to withstand rigorous riding conditions, ensuring a sustained performance that outlasts competitors.
Precision Fit
Designed to deliver perfect alignment, the 73 x 123mm spindle size ensures an ideal fit for various bike frames, enhancing smooth pedaling efficiency and overall ride quality.
Easy Installation
Featuring a square taper JIS design, the BB-UN300 allows for straightforward installation and compatibility with a wide range of cranks, making it accessible for both skilled and amateur cyclists.

Détails du produit

Get the best deals on SHIMANO Square Type Bicycle Bottom Bracket - BSA 73MM at Ubuy French Guiana. Explore a wide range of bike bottom brackets and enjoy fast shipping worldwide.
Brand NameSHIMANO
UPC192790622194
Part NumberEBBUN300C23X
ManufacturerShimano
ModelEBBUN300C23X
Unit Count1.0 Count
Included ComponentsBottom Brackets
Item Dimensions6.18 x 0.62 x 1.77 inches (15.7 x 1.6 x 4.5 cm)
Material TypeSteel Bearings
BrandSHIMANO
MaterialSteel Bearings
Item dimensions L x W x H6.18 x 0.62 x 1.77 inches (15.7 x 1.6 x 4.5 cm)
Number of Items1

À qui est-ce destiné ?

Suitable For
  • Casual Cyclists

    Ideal for those who ride occasionally and need a reliable, cost-effective bottom bracket for their bike.

  • Budget Builders

    Great for cyclists building or upgrading a bike on a budget, offering quality performance without breaking the bank.

  • Recreational Cyclists

    Perfect for riders who value comfort and durability in their components, suitable for daily commuting.

Not Suitable For
  • Competitive Racers

    Not suitable for high-performance racing setups where weight and advanced technology are critical for success.

DESCRIPTION DU PRODUIT

Shimano Square Type Bicycle Bottom Bracket - BSA 73Mm, Spindle: 122.5Mm (Ll123) - Ebbun300C23X | bottom-bike-brackets-and-accessories

Vous avez une question ? Chattez avec nous

Questions et réponses des clients

  • question: What is the Shimano BB-UN300 Bottom Bracket made for?

    répondre: The Shimano BB-UN300 Bottom Bracket is designed for a wide range of bicycles, particularly those utilizing a square taper interface. It is specifically engineered to accommodate English threading and has dimensions of 73mm shell width and 123mm spindle length. This makes it a perfect choice for mountain and road bikes alike, ensuring smooth pedaling and reliable performance. The bottom bracket provides the necessary support for your crankset, allowing for efficient power transfer and a more comfortable cycling experience.
  • question: How do I install the Shimano BB-UN300 Bottom Bracket?

    répondre: Installing the Shimano BB-UN300 requires a few tools, including a bottom bracket tool and possibly a crank arm puller. To install, first, ensure the bike is secure. Remove the old bottom bracket using the tool, and clean the shell before installation. Grease the threads of the new BB-UN300, then thread it into the frame until snug. Finally, attach your crankset. Proper installation minimizes wear and tear, ensuring optimal performance and longevity of your bike's drivetrain.
  • question: Is the Shimano BB-UN300 compatible with any bike?

    répondre: The compatibility of the Shimano BB-UN300 depends on your bike's specifications. It is designed for frames that use an English threaded bottom bracket system, specifically with a 73mm shell width. If your bike has a square taper crankset, it's highly likely that this bottom bracket will be compatible. Always check your bike's specifications or consult your local bike shop to confirm compatibility to ensure the best fit and performance during your rides.
  • question: What are the benefits of using the Shimano BB-UN300 Bottom Bracket?

    répondre: The Shimano BB-UN300 Bottom Bracket provides several benefits to cyclists. Its square taper design enhances the stiffness and efficiency of power transfer from the pedals to the drivetrain, resulting in smoother rides. The materials used ensure durability and resistance to wear and tear, which is crucial for consistent performance. Additionally, its ease of maintenance allows for simpler adjustments, making it an excellent choice for both casual cyclists and serious enthusiasts looking to enhance their biking experience.
  • question: What maintenance does the Shimano BB-UN300 require?

    répondre: To maintain the Shimano BB-UN300 Bottom Bracket, regular inspections are recommended. Check for any signs of wear, play in the crankset, or unusual noises while pedaling. Cleaning the area around the bottom bracket and applying fresh grease can help prolong its lifespan. If you encounter stiffness during rotation, it may indicate that the bearings need attention. By keeping your BB-UN300 clean and lubricated, you can ensure a smooth pedaling experience and effective power transfer throughout your rides.
  • question: What tools do I need to replace the Shimano BB-UN300 Bottom Bracket?

    répondre: To replace the Shimano BB-UN300 Bottom Bracket, you'll need specific tools, including a bottom bracket tool compatible with the Shimano BB standard. A crank arm puller can also be beneficial for removing the crankset before the replacement. Additionally, having a torque wrench on hand can help ensure that all components are installed securely, maintaining the correct specifications for safety and performance. Using the right tools makes the replacement process smoother and minimizes the risk of damage to the components.
  • question: How does the Shimano BB-UN300 perform under various riding conditions?

    répondre: The Shimano BB-UN300 is designed for reliable performance across various riding conditions, whether on paved roads, gravel paths, or mountain trails. Its sturdy construction ensures that it can handle the rigors of off-road cycling while maintaining efficiency on more straightforward surfaces. Cyclists have reported that it provides a solid feel and good response when pushing hard during climbs or sprinting. This adaptability makes it a versatile choice for riders looking to enjoy different terrains without changing their bottom bracket.
  • question: Can I use this bottom bracket with different cranksets?

    répondre: Yes, the Shimano BB-UN300 is compatible with a range of cranksets that utilize a square taper design. This means you can use it with various Shimano and other compatible cranksets. However, it’s crucial to ensure that the length and type of cranksets match the specifications of your bicycle. Riders looking to optimize their bike setup can benefit from this interchangeability, allowing them to customize their bike's performance based on their individual riding style and preferences.
  • question: What is the difference between English and Italian bottom brackets?

    répondre: The primary difference between English and Italian bottom brackets lies in their threading and width specifications. The English bottom bracket, like the Shimano BB-UN300, features a standard threading that is often more common and easier to find. In contrast, Italian bottom brackets typically have a wider shell and different threading, which can affect compatibility with frames and cranksets. Understanding these differences is crucial for selecting the right bottom bracket to ensure optimal performance and avoid compatibility issues.
  • question: Where can I buy Shimano BB-UN300 Bottom Bracket in French Guiana?

    répondre: You can conveniently purchase the Shimano BB-UN300 Bottom Bracket from Ubuy in French Guiana. Ubuy offers a reliable platform for finding cycling components, ensuring that you have access to genuine products that meet your biking requirements. With Ubuy's user-friendly interface and comprehensive product details, finding the right bottom bracket for your bike has never been easier.

SHIMANO Bottom Brackets Editorial Review

The SHIMANO Square Type Bicycle Bottom Bracket - BSA 73MM with a spindle length of 122.5MM LL123 is a great replacement for an old bottom bracket. It has sealed bearings that are slightly smoother and quieter. Customers were satisfied with the product; it was a perfect fit, and they experienced no problems with it. Some customers, however, had issues with the lack of instructions and the screws needed to re-connect the cranks as they are not supplied. The product's reputation for longevity was Considered high quality by most customers.

Avis et évaluations clients

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Avantages

  • Perfect fit for a 73mm bottom bracket shell
  • Sealed bearings make a smoother, quieter ride
  • High-quality reputation for longevity

Les inconvénients

  • Lack of instructions and supplied screws

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“Easy to find and order what you want on the website. Delivery is quick to the UK”

8 September 2026 · via Trustpilot
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€ 25

Commandez maintenant et recevez votre commande aux alentours du Monday, Septembre 28

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Conforme PCI DSS et certifié ISO 27001:2022, avec des paiements chiffrés et une protection complète de l'acheteur pour chaque commande.

Nos meilleurs partenaires logistiques
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  • dhl
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Caractéristiques et avantages

  • Fits JIS square-taper cranksets
  • Crankarm fixing bolts sold separately
  • Hollow spindle
  • BB Shell Width (mm):73 mm
  • Bottom Bracket Shell I.D.:1.37
  • Spindle Length:122.5

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