Product Features

Description

Shimano BB-UN300 Bottom Bracket – BSA 68mm / 122.5mm – Square Tapered (D-NL)

Manufacturer: Shimano

Shimano's BB-UN300 , distinguished by its reliability, long-lasting construction, and smooth operation, is an improved successor to the popular BB-UN26 and BB-UN55 models. Compatible with the vast majority of touring, city, road, and older generation MTB bikes, this bottom bracket offers wide compatibility with its square tapered (JIS) connection and BSA thread standard.

Combining Shimano's engineering quality with an affordable price, the BB-UN300 is one of the most preferred bottom bracket models thanks to its quiet operation, high durability, and low maintenance requirements.


🔧 Wide Bicycle Compatibility

This model works seamlessly with many Shimano and compatible cranksets that use a square tapered crank arm.
✔ City bikes
✔ Trekking / Touring bikes
✔ Old-style mountain bikes
✔ Classic road bikes


⚙️ BSA 68mm – 122.5mm Axle Dimension

The dimensions of this variant are:

  • Tooth type: BSA (British tooth)

  • Hub width: 68 mm

  • Wheelbase: 122.5 mm
    These dimensions guarantee compatibility with many Shimano entry-to-mid-level cranksets.


🏆 Square Taper (JIS) Connector

Thanks to Shimano's JIS standard:
✔ Easy assembly
✔ Secure locking
✔ Quiet and smooth pedaling experience
✔ High performance with compatible cranksets


🛠️ Key Features

  • Improved engineering: Successor to BB-UN26/UN55

  • Durable steel body

  • Reliable bearing structure.

  • Wide wheelbase option (This model has a 122.5mm wheelbase)

  • Compatible with: Road, city, and MTB systems.

  • Low maintenance requirements

  • Crank bolts are not included.


📌 Compatible Recommended Cranksets

It is fully compatible with many Shimano square tapered cranks:

  • FC-M311, M315, M351, M361, M371, M430

  • FC-M2000, M3000

  • FC-T3010

  • FC-MT100

  • FC-RS200

  • FC-TY301 / TY501 / TY701

  • FC-TX801

  • FC-A070, A073


Technical Data

Feature Value
Area of ​​Use Road, MTB, City, Trekking
Material Steel
Connection Type Square Cone (JIS)
Dental Standard BSA
Body Width 68 mm
Axle Length 122.5 mm
Assembly BSA Gear Bottom Bracket
Product Type BB-UN300

📦 Delivery Scope

  • 1 x Shimano Bottom Bracket BB-UN300 – BSA 68 / 122.5mm
    (Crank bolts are not included.)


⚖️ Weight

  • Approximately: 285 g

%100 Authenticity Guarantee

All our products are %100 original and are offered with quality and assurance. Uğur BisikletWe only source from reliable and authorized suppliers and act as their distributor to deliver the products to you. Shop with confidence, pedal quality!

Free Shipping and Free Returns

Frequently Asked Questions

📌 When will my order be shipped?

Your orders are shipped within 1-2 business days. This period may vary during promotional times due to volume.

📌 Which Shipping Company Do You Work With?

Domestic shipping is done via Yurtiçi Cargo in Turkey. International shipments are sent with DHL, FEDEX, or TNT.

📌 How can I track my order?

When your order is shipped, the tracking number will be shared via email and SMS. You can track your order on the courier company's website with this number.

📌 How can I return or exchange a product?

You can return products within 14 days unused and in their original packaging. For detailed return procedures, please review our return policy.

📌 When will I receive a refund for my returned product?

Once your return is approved, the payment will be refunded within 3-7 business days according to your payment method.

📌 Do your products have a warranty?

Yes! All products for sale are covered by manufacturer or distributor warranty. You can check product descriptions for warranty duration and terms.

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