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Shimano BB-UN300-K Square Taper JIS 68x122.5mm Hollow Spindle Bottom Bracket for Chain Case
Reference Number: 2N78C6
Upgrade your bike's performance with the Shimano BB-UN300-K Square Taper JIS Bottom Bracket - the perfect choice for reliable, smooth pedaling and enhanced durability. Designed specifically for bicycles with chain cases and JIS square-taper cranksets, this high-quality bottom bracket ensures optimal power transfer and seamless integration for your cycling setup.
Materials & Engineering Excellence
Constructed with precision-machined components, the Shimano BB-UN300-K features a lightweight, hollow spindle that enhances rotational efficiency while reducing weight. Crafted from durable materials with corrosion-resistant properties, this bottom bracket provides long-lasting performance in various riding conditions, from urban commuting to rugged trails.
Advanced Components & Technology
Engineered for compatibility with 68mm shell widths and a 1.37-inch shell diameter, the BB-UN300-K uses squared Taper JIS interface technology for secure, slip-free fitting with your compatible cranksets. Although crankarm fixing bolts are sold separately, this bottom bracket's robust construction guarantees stability and smooth operation across countless miles.
Style & Use Case
Featuring a sleek black finish, the Shimano BB-UN300-K offers a clean, streamlined appearance that complements a variety of bike styles. Ideal for city bikes, touring bikes, and classic fietsen, this bottom bracket is optimized for use with chain case setups, helping to protect your drivetrain from dirt and grime while delivering consistent power transfer.
Innovative and Differentiating Features
The hollow spindle design not only reduces weight but also minimizes rotational drag, improving pedaling efficiency. With a straightforward installation process and compatibility with standard JIS square-taper cranksets, this bottom bracket is a reliable upgrade for enthusiasts seeking durability and performance at an affordable price.
Key Specifications:
- Shell Diameter: 1.37 inches (English interface)
- Shell Width: 68mm
- Spindle Length: 122.5mm
- Spindle Interface: Square Taper JIS
- Construction: Hollow spindle for lightweight strength
- Finish: Black for a sleek look
Enhance your bike's reliability and efficiency with the Shimano BB-UN300-K Square Taper Bottom Bracket - the perfect component for maintaining smooth, powerful pedaling while protecting your drivetrain in challenging conditions. Optimize your cycling experience today!
- High-performance Shimano BB-UN300-K Square Taper Bottom Bracket designed for JIS English threaded frames, ensuring a secure and reliable fit.
- Constructed with a hollow spindle for enhanced weight savings and efficient power transfer during cycling.
- Compatible with square-taper cranksets and chain case setups, making it ideal for classic and city bikes requiring durable, low-friction bottom brackets.
- Manufactured with high-quality materials for long-lasting performance and smooth rotation, even under demanding riding conditions.
- Features a sleek black finish and precise 68mm shell width, providing a clean look and optimized compatibility with a variety of bicycle frames and components.
| Item Specifications | |
|---|---|
| Bottom Bracket Shell I.D. | 1.37 |
| BB/Frame Interface | English |
| BB Shell Width (mm) | 68 |
| Spindle Interface Type | Square Taper JIS |
| Spindle Length | 122.5 |
| Defined Color | Black |
Why 365 Cycles?
365 Cycles is an Authorized Shimano Dealer, and we offer the Full Shimano Warranty!
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365 Cycles delivers all your cycling needs fast! We don't waste time preparing your order. Our priority is to serve our customers first and foremost. If you need help picking the right product, have questions about bike component compatibility, or just want to geek out about bikes we are here 7 days a week! Simply put, we are bike experts from dirt to tarmac and want to make sure you get the full 365 Cycles experience when you shop with us.
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Shipping & Handling
Most orders placed during the workweek before 1:30 pm EST ship the same day, but in rare cases (peak season/holiday periods) handling time can take up to 48 hours. If you have questions regarding shipping estimates, please let us know prior to placing your order. There is a direct signature requirement for all orders over $500.Please allow 1-2 business days for your order tracking to update.
- Cut off for SAME DAY SHIPPING- 1:30 pm EST Monday - Friday
- Friday afternoon -Sunday orders ship the following Monday
- Due to carrier restrictions orders shipped to: PO Box, HI, AK, & PR 365 Cycles may use a comparable service to what was selected.
Combined Shipping Discounts
To offer customers savings on shipping, we offer discounts when shipping multiple items from our store. We cannot issue refunds on shipping once an order is finalized so please follow the 5 steps below and ask if you are having trouble with the discount before you make a purchase.- Be sure you are using the US site: https://www.ebay.com
- Select Add to Cart (instead of Buy It Now) with items from our store 365Cycles
- Click on Proceed to Checkout. On the checkout page, the shipping service on each line item needs to match
- Compare First Class vs Priority as sometimes Priority can be cheaper and it gets to you faster!
- You’ll need to change the shipping method to Priority on every item in your cart before the rate can be calculated.
Returns
365 Cycles offers returns for 30 days on new items in their original, intact packaging. Return shipping for ALL orders are to be paid by the buyer. Please be sure to read our return policy entirely and if you have any questions, please contact Customer Service.
Full refunds are issued on items that are brand new and we are able to resell as new. 365 Cycles reserves the right to deny returns that are outside of policy including, but not limited to, used items, items missing original packaging, items with damaged manufacturer packaging, or international orders. Return orders must be shipped in a box or bubble mailer. Items shipped without an outer box will incur a restocking fee. You will be contacted through eBay if your return is ineligible for a full refund.
Returns must be initiated within 30 days from purchase date through your Purchase History under My eBay.
If we make an error in shipping, please contact us -- we will ship out the correct item and provide a free prepaid return label as quickly as possible!
Exchanges
If you need to exchange your order, the fastest and easiest way to do this is to reorder. We will ship your new order immediately and, in the meantime, please initiate a return through eBay on the original item and return it. We will refund for the returned item once it is received back.
