Here's a quick overview of our return and refund policy: 7-Day Return Window : You can initiate a return within 7 days of receiving your product. Eligibility : Items must be unused, in original condition, with all tags and packaging. Only select items like apparel (helmets, jerseys, gloves, etc.) are eligible. Non-Returnable Items : Wetsuits and items discounted over 5% are not eligible for returns. Compatibility Issues : Returns are not accepted for compatibility-related issues unless the product description on our website was incorrect. If you're unsure, please contact us before ordering. Shipping & Processing : Return shipping is to be arranged by the customer. No pickups available. Refund Options : Choose between exchange, store credit, or monetary refund (after deductions for shipping and transaction fees). Order Cancellations : Only possible before the order is processed. For full details, visit our Return & Refund Policy page.

Shimano BB-UN300 Square Type Bottom Bracket

Name: Shimano BB-UN300 Square Type Bottom Bracket
Brand: Shimano
SKU: EBBUN300B07X
Price: 1180.0 INR
Availability: InStock

EBBUN300B07X

₹1,180

Size

68x107 mm 68x110 mm 68x113 mm 68x115mm(D-H) 68x118mm(XL118) 68x122.5 mm(D-NL) 68x122.5 mm (LL123) 73x118 mm 73x122.5 mm

Product variants

Threaded

Durable Square Taper Bottom Bracket for Reliable Riding

Description

The Shimano BB-UN300 is a square taper bottom bracket built to deliver long-lasting performance and dependable support for your drivetrain. Designed with Shimano’s renowned durability, it’s ideal for recreational and everyday riding.

Smooth, Stable Operation: Featuring cartridge bearings, the BB-UN300 offers smoother rotation and reduced friction over extended use. Its internal construction ensures a sealed, maintenance-free experience that stands up to weather and debris.

Improved Chainline Stability: The integrated chain line stabilizer helps maintain precise alignment, contributing to better drivetrain performance and gear shifting. This feature is especially valuable in keeping your ride efficient and responsive.

Multiple Structure Options: Whether you ride with a standard setup, E-type front derailleur, or chain case, the BB-UN300 supports all three configurations. This makes it a flexible upgrade or replacement for a wide range of bicycles.

With an aluminum adapter and steel axle, the Shimano BB-UN300 balances strength and weight. It’s a cost-effective solution for riders seeking Shimano reliability without compromising on quality.

Features

Smooth Cartridge Bearing Performance: Sealed cartridge bearings ensure low friction and long-lasting smooth rotation with minimal maintenance.
Stable Chainline Support: Built-in chainline stabilizer improves drivetrain alignment for efficient pedaling and precise shifting.
Versatile Structure Compatibility: Compatible with standard, E-type and chain case setups, offering installation flexibility across various bikes.
Durable Construction: Features a sturdy steel axle paired with a lightweight aluminum adapter for a balance of strength and performance.
Multiple Length Options: Available in a wide range of axle lengths and shell widths to match specific frame and crank configurations.

Specifications

Model No: BB-UN300
Series: Shimano
Structure|Standard: Yes
Spindle|Square Type: Yes
Axle Length/Shell Width (mm): 107|68 (BC1.37), LL113|73 (BC1.37), XL118|73 mm, LL123|68 (BC1.37), LL123|73 (BC1.37)
Axle Length/Shell Width (mm)*: D-H|68 (BC1.37), D-NL 122|73 (BC1.37), D-EL 127|68 (BC1.37)
*Remarks: w/ Crank Arm Fixing Screws spec. only
Axle Length/Shell Width (mm)**: MM110|68 (BC1.37), LL113|68 (BC1.37), 117.5|68 (BC1.37), XL118|68 (BC1.37), D-NL 122|68 (BC1.37)
**Remarks: w/ Crank Arm Fixing Screws spec. is available

Shimano Warranty Information

Shipping Policy

We ship across India with free shipping on orders above ₹2,000 (₹99 for orders below ₹2,000). Cash on Delivery is available up to ₹20,000, with additional COD fees based on order value. Orders typically arrive within 3–6 working days, though delays may occur.

Note: Most Shimano products may take longer to ship. View full shipping policy

Returns & Refunds

Here's a quick overview of our return and refund policy:

7-Day Return Window: You can initiate a return within 7 days of receiving your product.
Eligibility: Items must be unused, in original condition, with all tags and packaging. Only select items like apparel (helmets, jerseys, gloves, etc.) are eligible.
Non-Returnable Items: Wetsuits and items discounted over 5% are not eligible for returns.
Compatibility Issues: Returns are not accepted for compatibility-related issues unless the product description on our website was incorrect. If you're unsure, please contact us before ordering.
Shipping & Processing: Return shipping is to be arranged by the customer. No pickups available.
Refund Options: Choose between exchange, store credit, or monetary refund (after deductions for shipping and transaction fees).
Order Cancellations: Only possible before the order is processed.

For full details, visit our Return & Refund Policy page.