Shimano Tiagra BB-RS501 bottom bracket for frames with BSA or Italian thread

The Shimano BB-RS501 bottom bracket allows you to install a crankset with a 24 mm axle into a road bike frame with threaded bearing. Depending on the version, it is a BSA or ITA bottom bracket shell with 68 mm or 70 mm width. Shimano recommends BB-RS501 for the cranksets of the Tiagra, Sora, Claris, Alfine, GRX RX600 series and for a number of no-group models. It features an optimised seal design that extends durability. The bearings are made of steel, the bearing cups of anodised aluminium. In combination with a corresponding crankset, this bottom bracket and its Hollowtech II technology ensures stability and efficiency with every pedal rotation.

Specifications:

Application:

Road, Cyclocross, Gravel, City

Type:

BSA, ITA

Shell Width:

68 mm, 70 mm

Axle Diameter:

24 mm (Hollowtech II)

Technical Information:

Bearings:

steel

Bottom Bracket Cup Material:

aluminium

Compatibility:

Recommended for:

• Tiagra FC-4700, FC-4703
• Sora FC-R3030, FC-R3000
• Claris FC-R2030, FC-R2000
• Alfine FC-S501
• GRX FC-RX600
• FC-RS520, FC-RS510, FC-R460, FC-RS400
• FC-CX50

Features:

• anodised bearing cups
• improved seal design
• long life

Technology:

Hollowtech II
Shimano Hollowtech II is a crank bottom bracket system designed to achieve an ideal ratio of stiffness, weight and rotational efficiency. It is based on an integration of the bottom bracket and the right crank arm and works with a 24 mm axle or bearing diameter, which has proven to be optimal in terms of stability. In many cases, the bearing cups are on the outside so that the load is better distributed. High-quality precision seals ensure a long service life.

Models:

BSA:

Shell Width:

68 mm

Manufacturer Number:

EBBRS501B

ITA:

Shell Width:

70 mm

Manufacturer Number:

EBBRS501I

Contents:

Shimano BB-RS501 bottom bracket, consisting of:

• 1 x right bearing cup with bearings
• 1 x left bearing cup with bearings
• 1 x bottom bracket centre tube

Order Together:

• bottom bracket tool TL-FC32 or TL-FC36, or tool insert TL-FC33