What Is It?
The Shimano BB-RS501 R&L Adapter Bearing is a HOLLOWTECH II threaded bottom bracket designed for Shimano road and fitness bike cranksets with a 24 mm integrated spindle. Supplied as a complete right and left bearing cup assembly, it provides smooth, efficient crank rotation and long-lasting durability for a wide range of Shimano 2-piece cranksets.
Featuring anodised aluminium bearing cups with high-quality sealed cartridge bearings, the BB-RS501 offers reliable performance in all weather conditions while maintaining low maintenance requirements. It is compatible with 68 mm (BSA/English) and 70 mm (Italian) threaded bottom bracket shells, depending on the selected version.
Key Benefits
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HOLLOWTECH II Design: Designed for Shimano 24 mm integrated spindle cranksets.
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Smooth Bearing Performance: Sealed cartridge bearings reduce friction and improve pedalling efficiency.
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Durable Aluminium Cups: Anodised aluminium adapters provide strength and corrosion resistance.
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Complete R&L Assembly: Includes both right and left threaded bearing cups.
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Weather Resistant: Sealed bearings help protect against water and dirt ingress.
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Lightweight Construction: Balances durability with low overall weight.
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Easy Installation: Compatible with standard Shimano HOLLOWTECH II bottom bracket tools.
Specifications
| Specification |
Details |
| Product |
Shimano BB-RS501 R&L Adapter Bearing |
| Series |
Shimano Road |
| Bottom Bracket Type |
HOLLOWTECH II Threaded |
| Bearing Type |
Sealed Cartridge Bearings |
| Crank Compatibility |
Shimano 24 mm HOLLOWTECH II Cranksets |
| Bottom Bracket Shell Width |
68 mm (BSA) / 70 mm (Italian, model dependent) |
| Cup Material |
Anodised Aluminium |
| Average Weight |
Approximately 93 g |
| Thread Type |
BSA (1.37" × 24 TPI) or Italian (36 × 24 TPI), depending on version |
Compatible Components
The Shimano BB-RS501 is compatible with:
- Shimano Claris HOLLOWTECH II cranksets
- Shimano Sora HOLLOWTECH II cranksets
- Shimano Tiagra HOLLOWTECH II cranksets
- Shimano 105 HOLLOWTECH II cranksets
- Shimano GRX HOLLOWTECH II cranksets
- Other Shimano road cranksets using a 24 mm integrated axle
It is also the recommended bottom bracket for several Shimano road cranksets, including FC-R2000, FC-R3000, and FC-RS400.
Who Is This Best Suited For?
The Shimano BB-RS501 R&L Adapter Bearing is ideal for:
- Road cyclists
- Gravel riders
- Fitness cyclists
- Commuters
- Endurance riders
- Cyclists replacing a worn HOLLOWTECH II bottom bracket
- Riders upgrading to a Shimano 24 mm integrated crankset
Compatibility Note: The BB-RS501 is designed for Shimano HOLLOWTECH II road cranksets with a 24 mm spindle. Ensure you select the correct version for your frame's bottom bracket standard (BSA/English or Italian) and shell width before installation. It uses the larger 44 mm, 16-notch Shimano bottom bracket tool for installation and removal.
