Shimano TL-FC16 crank removal tool for Hollowtech II bottom brackets - Y13009220
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Shimano BB-UN300-K bottom bracket, BSA square taper 122.5/68 mm
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Shimano BB-UN300-K – BSA square taper 122.5 mm / 68 mm
The Shimano BB-UN300-K is a square-axle bottom bracket designed for bikes fitted with a standard 68 mm BSA thread. With its 122.5 mm axle, it is perfectly suited to many triple or double chainring configurations. Its sealed cartridge provides maximum protection against moisture and dirt, ensuring increased durability. This model is easy to install and requires little maintenance. Ideal for use on the road, in town, or for trekking.
Technical specifications
- Type: Square-axle bottom bracket (cartridge)
- Thread: BSA (1.37 x 24 TPI – English)
- Bottom bracket width: 68 mm
- Axle length: 122.5 mm
- Compatibility: Road bike, MTB, city bike, trekking
- Sealing: Sealed cartridge
- Weight: Approx. 300 g
- Installation: Simple, maintenance-free
- Brand: Shimano
- Shimano part number: BB-UN300-K
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Christine G. 
Published May 14, 2026 at 07:12 pm (Order date: May 01, 2026)Identical to the old one (Translated review)
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