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- Shimano UN300 English Bottom Bracket
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Item #:
104927371
Shimano UN300 English Bottom Bracket
89% of respondents would recommend this to a friend
Item #:
104927371
XAF 17509
Price Details
Excluding Shipping & Custom charges ( Shipping and custom charges will be calculated on checkout )
*All items will import from US
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In stock
Imported from USA store
QTY:
Order now and get it around Sunday, September 20
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High quality sealed bottom bracket with a squared taper and new chain line stabilizer for increased chain reliability.
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Note: Step Down Voltage Transformer required for using electronics products of US store (110-120). Recommended power converters Buy Now.
What Stands Out
Smooth Operation
The Shimano UN300 provides exceptionally smooth pedaling efficiency, minimizing friction and enhancing rider comfort during long rides, making it ideal for both casual cyclists and serious enthusiasts.
Durable Design
Constructed with high-quality materials, the Shimano UN300 boasts a robust design that withstands rigorous usage and environmental conditions, ensuring longevity and solid performance across multiple seasons.
Versatile Compatibility
Designed to fit a wide range of bike frames and cranksets, the Shimano UN300 caters to diverse cycling setups, offering seamless integration and enhancing your bike's overall functionality.
Product Details
Who Should Buy?
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Casual Cyclists
Ideal for occasional riders needing reliability and smooth operation without complex maintenance.
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Budget-Conscious Riders
Great choice for those seeking quality components at an affordable price, ensuring a decent performance.
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Replacement Needs
Perfect for users looking to replace worn-out bottom brackets without upgrading to higher-end models.
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Competitive Cyclists
Not suitable for racers or performance enthusiasts looking for ultra-lightweight or high-end components.
Product Description
Shimano UN300 English Bottom Bracket
Have any Query? Chat with us
Customer Questions & Answers
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Question:
What is the difference between the spindle lengths available?
Answer: The spindle lengths provide options to fit different setups; choose based on your crankset compatibility. -
Question:
Are the crankarm fixing bolts included with the bottom bracket?
Answer: No, the crankarm fixing bolts are sold separately. -
Question:
Can this bottom bracket be used with other types of cranksets?
Answer: This bottom bracket is specifically designed for JIS square-taper cranksets.
SHIMANO Bottom Brackets Editorial Review
The Shimano UN300 English Bottom Bracket has garnered a positive reception among cyclists, particularly those looking to upgrade or maintain older bikes. Reviews highlight its smooth performance and ease of installation, making it an appealing option for both seasoned bike mechanics and beginners alike. Many users appreciated the exact fit and minimal slop, significantly enhancing their bike's drivability and efficiency. A common theme in the feedback is the joy of tackling what was perceived as a daunting task, only to find the process straightforward and rewarding. Customers have noted that the bottom bracket's bearings are exceptionally smooth, leading to an improved overall riding experience, with one user even describing their bike as having a "new life" after the installation. Additionally, the durability of Shimano products is mentioned, with some users referencing their previous bottom brackets lasting for two decades under rigorous conditions. Although some users pointed out the requirement for specific tools—like a socket and crank arm puller—these tools are Considered a worthy investment given the cost savings compared to professional bike shop services. In summary, the Shimano UN300 English Bottom Bracket is well-received for its quality, installation ease, and performance enhancement, making it a recommended choice for DIY bike enthusiasts looking to improve older models. **
Customer Reviews & Ratings
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Pros
- Smooth operation and zero slop
- Exact fit and compatibility for older bikes
- Easy installation process
- Good value for money compared to professional installation
- Durable, with longevity reported by previous users
Cons
- Requires specific tools for installation, which are sold separately
Platform Trust & Buyer Confidence
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Jasmin
Verified buyer
“Great products and very good service: very easy and very fast international delivery.”
9 September 2026 · via Trustpilot
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Anke
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10 September 2026 · via Trustpilot
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Verified buyer
“Very easy to find the products what you need, and so fast delivery, that’s why I highly recommended to others costumers to used ubuy.”
10 September 2026 · via Trustpilot
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Opaleye
Verified buyer
“I received exactly what I ordered I was skeptical about your site because that was my first time to order. But the order came timely and neatly packaged. I was not disappointed. Thank you.”
11 September 2026 · via Trustpilot
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Adele
Verified buyer
“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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Important information
- Limitations : For products shipped internationally, please note that any manufacturer warranty may not be valid; manufacturer service options may not be available; product manuals, instructions, and safety warnings may not be in destination country languages; the products (and accompanying materials) may not be designed in accordance with destination country standards, specifications, and labeling requirements; and the products may not conform to destination country voltage and other electrical standards (requiring use of an adapter or converter if appropriate). The recipient is responsible for assuring that the product can be lawfully imported to the destination country. When ordering from Ubuy or its affiliates, the recipient is the importer of record and must comply with all laws and regulations of the destination country.
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XAF 17509
Order now and get it around Sunday, September 20
This item is not restrict in my country.(Please click on above link if this item is not restrict in your country, So our team will review and allow.)
QTY:
Secured transaction
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Fastest cross-border delivery
Features & Benefits
- High-quality sealed bottom bracket for durability.
- Designed specifically for JIS square-taper cranksets.
- Features a new chain line stabilizer for enhanced reliability.
- Available in multiple spindle and shell lengths for versatile fit.
- Made from extra strong aluminum for added strength.
- Crankarm fixing bolts sold separately for customization.
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