Shimano Un-300 Bsa Bottom Bracket 73 mm Silver / Black
Shimano Un-300 Bsa Bottom Bracket 73 mm Silver / Black
Overall Rating: 4.1 / 5 (average from multiple review sources, as of 3 Oct 2026)
Based on a total of 44,819 customer reviews from independent review platforms.
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Based on a total of 44,819 customer reviews from independent review platforms.
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The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
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£10.99
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Shimano Bottom Bracket UN300 73 x 123mm Square Taper BB British Thread
Overall Rating: 1.2 / 5 (average from multiple review sources, as of 2 Oct 2026)
Based on a total of 24,032 customer reviews from independent review platforms.
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The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
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pricehunter.co.uk cannot guarantee that published shop ratings originate from consumers who have actually made a purchase from the reviewed retailer.
Based on a total of 24,032 customer reviews from independent review platforms.
Sources & Transparency:
The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
All brand names and logos are the property of their respective owners.
Notice:
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Will usually delivered within 1 - 2 working days of receiving cleared payment.
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£13.99
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Shimano BB-UN300 Square Taper Bottom Bracket - 107 to 127mm - 68/73mm
Overall Rating: 1.2 / 5 (average from multiple review sources, as of 2 Oct 2026)
Based on a total of 24,032 customer reviews from independent review platforms.
Sources & Transparency:
The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
All brand names and logos are the property of their respective owners.
Notice:
pricehunter.co.uk cannot guarantee that published shop ratings originate from consumers who have actually made a purchase from the reviewed retailer.
Based on a total of 24,032 customer reviews from independent review platforms.
Sources & Transparency:
The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
All brand names and logos are the property of their respective owners.
Notice:
pricehunter.co.uk cannot guarantee that published shop ratings originate from consumers who have actually made a purchase from the reviewed retailer.
Will usually delivered within 2 - 3 working days of receiving cleared payment.
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£13.99
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SHIMANO BB-UN300 Vierkant-Innenlager // BSA 73x123 mm (Alivio)
Overall Rating: 2.3 / 5 (average from multiple review sources, as of 3 Oct 2026)
Based on a total of 47,822 customer reviews from independent review platforms.
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The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
All brand names and logos are the property of their respective owners.
Notice:
pricehunter.co.uk cannot guarantee that published shop ratings originate from consumers who have actually made a purchase from the reviewed retailer.
Based on a total of 47,822 customer reviews from independent review platforms.
Sources & Transparency:
The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
All brand names and logos are the property of their respective owners.
Notice:
pricehunter.co.uk cannot guarantee that published shop ratings originate from consumers who have actually made a purchase from the reviewed retailer.
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£14.46
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Shimano BB-UN300 bottom bracket British thread, 73 - 122.5 mm (LL123)
Overall Rating: 1.2 / 5 (average from multiple review sources, as of 2 Oct 2026)
Based on a total of 24,032 customer reviews from independent review platforms.
Sources & Transparency:
The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
All brand names and logos are the property of their respective owners.
Notice:
pricehunter.co.uk cannot guarantee that published shop ratings originate from consumers who have actually made a purchase from the reviewed retailer.
Based on a total of 24,032 customer reviews from independent review platforms.
Sources & Transparency:
The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
All brand names and logos are the property of their respective owners.
Notice:
pricehunter.co.uk cannot guarantee that published shop ratings originate from consumers who have actually made a purchase from the reviewed retailer.
Will usually delivered within 3 - 4 working days of receiving cleared payment.
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£14.46
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Shimano BB-UN300 BSA Bottom Bracket, Bottom bracket dimensions 123/73mm
Overall Rating: 4.5 / 5 (average from multiple review sources, as of 7 Oct 2026)
Based on a total of 33,595 customer reviews from independent review platforms.
Sources & Transparency:
The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
All brand names and logos are the property of their respective owners.
Notice:
pricehunter.co.uk cannot guarantee that published shop ratings originate from consumers who have actually made a purchase from the reviewed retailer.
Based on a total of 33,595 customer reviews from independent review platforms.
Sources & Transparency:
The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
All brand names and logos are the property of their respective owners.
Notice:
pricehunter.co.uk cannot guarantee that published shop ratings originate from consumers who have actually made a purchase from the reviewed retailer.
1 to 3 business days
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£16.23
Delivery from £9.54
Shimano BB-UN300 Bottom Bracket British Thread (73 - 122.5 mm LL123) F
Overall Rating: 3.5 / 5 (average from multiple review sources, as of 6 Oct 2026)
Based on a total of 4,581 customer reviews from independent review platforms.
Sources & Transparency:
The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
All brand names and logos are the property of their respective owners.
Notice:
pricehunter.co.uk cannot guarantee that published shop ratings originate from consumers who have actually made a purchase from the reviewed retailer.
Based on a total of 4,581 customer reviews from independent review platforms.
Sources & Transparency:
The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
All brand names and logos are the property of their respective owners.
Notice:
pricehunter.co.uk cannot guarantee that published shop ratings originate from consumers who have actually made a purchase from the reviewed retailer.
1-3 working days
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£17.99
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Shimano UN300 Bottom Bracket Bike Cycle Bicycle BB Square Taper Sealed Cartridge
Overall Rating: 1.2 / 5 (average from multiple review sources, as of 2 Oct 2026)
Based on a total of 24,032 customer reviews from independent review platforms.
Sources & Transparency:
The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
All brand names and logos are the property of their respective owners.
Notice:
pricehunter.co.uk cannot guarantee that published shop ratings originate from consumers who have actually made a purchase from the reviewed retailer.
Based on a total of 24,032 customer reviews from independent review platforms.
Sources & Transparency:
The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
All brand names and logos are the property of their respective owners.
Notice:
pricehunter.co.uk cannot guarantee that published shop ratings originate from consumers who have actually made a purchase from the reviewed retailer.
Will usually delivered within 4 - 8 working days of receiving cleared payment.
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£20.89
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Shimano BB-UN300 bottom bracket British thread, 73 - 122.5 mm (LL123)
Overall Rating: 1.2 / 5 (average from multiple review sources, as of 2 Oct 2026)
Based on a total of 24,032 customer reviews from independent review platforms.
Sources & Transparency:
The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
All brand names and logos are the property of their respective owners.
Notice:
pricehunter.co.uk cannot guarantee that published shop ratings originate from consumers who have actually made a purchase from the reviewed retailer.
Based on a total of 24,032 customer reviews from independent review platforms.
Sources & Transparency:
The values are derived from publicly available retailer ratings from platforms such as Feefo, http://Reviews.io , Trustpilot, and others, and are aggregated monthly.
All brand names and logos are the property of their respective owners.
Notice:
pricehunter.co.uk cannot guarantee that published shop ratings originate from consumers who have actually made a purchase from the reviewed retailer.
Will usually delivered within 9 - 11 working days of receiving cleared payment.
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£21.24
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Shimano Un-300 Bsa Bottom Bracket. Upgrade your ride with the SHIMANO UN-300 BSA Bottom Bracket. This benchmark component offers unmatched durability and smooth pedaling thanks to its advanced sealed cartridge bearing design, effectively blocking dirt and water. It’s a versatile and reliable choice for MTB, commuting, touring, and road cycling, providing a precise, secure fit with its classic square taper spindle and BSA threaded interface. Experience efficient power transfer and a silent, fluid rotation for countless miles of enjoyable cycling. A dependable, fire-and-forget solution for any bike build or service. Praised for its superb Shimano quality and reliability, this square taper bottom bracket is a durable and robust upgrade over basic plastic models. It is easy to install and runs very smoothly, with a quality surface treatment and precise, evenly angled JIS standard axle ends. This ensures compatibility with the vast majority of square taper cranks. A dependable, long-lasting
£10.99
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Product information
At a glance
- Simple installation for quick upgrades.
- Long-lasting materials for durability on any ride.
- Smooth performance for effortless cycling experience.
Note: This text was created with the help of AI.
Upgrade Your Ride with the Shimano BB-UN300
The Shimano BB-UN300 BSA 73mm x 122.5mm is a fantastic choice for cyclists of all levels, from casual riders to serious enthusiasts. This bottom bracket is designed to enhance your bike's performance, ensuring a smoother and more enjoyable ride. Whether you're commuting to work, taking on rugged trails, or enjoying a leisurely ride through the park, this component will help you get the most out of your cycling experience. You can explore a variety of Bottom Brackets to fit your needs, but the BB-UN300 stands out for its reliability and efficiency.
Stellar Performance Features
The Shimano BB-UN300 boasts a range of impressive features that contribute to its stellar performance. This bottom bracket is built with a durable outer cup design, ensuring longevity and resilience against the elements. Its sealed cartridge construction minimizes maintenance while providing a smooth rotation, letting you focus on your ride without any distractions. Additionally, the 73mm width and 122.5mm spindle length make it ideal for a wide variety of frames and setups, ensuring compatibility with your bike. Key advantages include:
- Easy Installation: The user-friendly design allows for straightforward installation, perfect for DIY bike repair enthusiasts.
- Enhanced Durability: Made from quality materials that withstand wear and tear, ensuring it will keep you rolling for miles.
- Smooth Operation: Experience a seamless ride with minimal friction, making every pedal stroke count.
Sleek Design and Compatibility
Not only does the Shimano BB-UN300 excel in performance, but it also sports a sleek and modern design that complements any bike aesthetic. The black finish is not only stylish but also functional, helping to repel dirt and grime while maintaining a clean look. This bottom bracket’s versatile specifications make it compatible with a variety of cranksets and bicycle frames, allowing you to customize your ride to fit your unique style.
Why Choose the Shimano BB-UN300?
Choosing the Shimano BB-UN300 means investing in a reliable component designed for cyclists who value performance and ease of use. It’s an excellent upgrade for your bike that promises not just to enhance your riding experience but also to extend the life of your components. With its combination of durability, performance, and sleek aesthetics, this bottom bracket is a no-brainer for anyone looking to elevate their cycling game. Don’t miss out on the chance to transform your ride into an effortless and enjoyable experience!
Note: This text was created with the help of AI.
Pros and cons
Pros
- Easy installation for DIY repair
- Durable materials for longevity
- Smooth operation with minimal friction
- Compatible with various setups
- Sleek design repels dirt
Cons
- May not suit all cyclists
- Performance benefits vary by bike
Note: This text was created with the help of AI.
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15 Variants from £10.75
Shimano BB-UN300 Tapered Bottom Bracket British Thread Silver
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Delivery from £2.95
Shimano BB-UN300 Tapered Bottom Bracket British Thread Silver
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Delivery from £2.95
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