Shimano
SHIMANO BB-UN300 BOTTOM BRACKET / BSA 68 MM SQUARE TAPER CARTRIDGE BEARING
SHIMANO BB-UN300 BOTTOM BRACKET / BSA 68 MM SQUARE TAPER CARTRIDGE BEARING
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SHIMANO BB-UN300 SQUARE TAPER BOTTOM BRACKET (BSA 68 MM) – THE DURABLE AND RELIABLE MAINTENANCE STANDARD
The proven and absolutely carefree basis for your everyday, city, trekking bike or classic mountain bike: The Shimano BB-UN300 square taper bottom bracket impresses as an extremely robust successor to the legendary BB-UN26 and BB-UN55 series. Designed as a sealed cartridge bottom bracket, it highly effectively protects the high-precision, internal ball bearings from the ingress of water, mud, and dust. This guarantees a silky smooth, low-friction ride and an impressively long service life – even in harsh year-round use in all weather conditions.
This highly functional **bicycle bottom bracket** is designed for frames with the widely used **BSA thread (68 mm shell width)** and relies on the proven, standardized **JIS square taper axle interface**. Thanks to a stable housing construction, the cartridge bottom bracket offers excellent axle stability and absorbs pedaling forces with high torsional rigidity. Available in a wide selection of different axle lengths, the chain line of your crankset can be precisely adjusted to minimize cross-chaining and ensure error-free derailleur function.
Product Details & Features
• Sealed Cartridge System: Maintenance-free, integrated bearing unit for maximum protection against weather influences
• Precise Square Taper Axle: Reliable JIS standard for perfect, play-free fit of all compatible square taper crank arms
• Versatile Chainline Adjustment: Wide selection of precisely graded axle lengths for every frame and crank type
Data & Identification (BSA 68 mm)
• Brand: Shimano | Model: BB-UN300 | Thread Type: BSA | Shell Width: 68 mm | Axle Type: Square Taper (JIS)
• 107 mm: HAN EBBUN300B07X | EAN 4550170619282
• 110 mm: HAN EBBUN300B10X | EAN 4550170619206
• 113 mm: HAN EBBUN300B13X | EAN 4550170619329
• 115 mm: HAN EBBUN300B15B | EAN 4550170619183
• 117 mm: HAN EBBUN300B17X | EAN 4550170619220
• 118 mm: HAN EBBUN300B18X | EAN 4550170619237
• 127 mm: HAN EBBUN300B27B | EAN 4550170619312
Scope of Delivery
1x Shimano BB-UN300 Square Taper Bottom Bracket (BSA 68 mm) in the selected axle length, including adapter cup, without crank bolts.
Conclusion
The Shimano BB-UN300 bottom bracket is the ultimate choice for all cyclists looking for a durable, maintenance-free replacement part. If you want to stably renew the foundation of your **bicycle drivetrain**, this cartridge bottom bracket guarantees first-class OEM quality.
Product Information & Conditions
GPSR Information
Manufacturer
Shimano Europe B.V.
High Tech Campus 92
5656 AG Eindhoven
Niederlande
Email: privacy@shimano-eu.com
Note: All product information and technical data are compiled with the utmost care. Nevertheless, errors, discrepancies, or changes cannot be ruled out. Manufacturers reserve the right to change specifications, features, and weights without prior notice. Subject to change without notice.
NEW / DISCONTINUED GOODS WITH GUARANTEE / USED GOODS WITH GUARANTEE
Our standard
We invest considerable time and care in each of our bicycles and parts before they go on sale. Every bike and every item is thoroughly cleaned, inspected, and, if necessary, fitted with new wear parts to ensure it's technically sound and visually appealing.
This is precisely where we differ from many other providers: You only receive items from us that have been honestly and conscientiously inspected. The condition and all relevant information can be found transparently and comprehensibly in our item information and terms and conditions .
This way, you know exactly what to expect – and can be sure that you'll get a bike or part that will give you long-lasting pleasure without the need for major repairs after a short period of time.
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USED GOODS - Warranty
If you choose our used bicycles, components, or equipment, you benefit from additional security: We offer a one-year warranty . So you can ride worry-free, knowing we'll stand behind you even after your purchase.
Note: Items expressly marked as “defective” or “DIY goods” are excluded from the warranty.
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NEW GOODS - Guarantee
When you purchase new bikes, exhibition pieces, demonstration models, or discontinued items, you are doubly protected: You receive a 2-year manufacturer's warranty or a 2-year guarantee – clearly and transparently stated in the item information.
This means you are better protected than if you were buying privately, and you can rely on our support even after the purchase.