SHIMANO TIAGRA RS501 BOTTOM BRACKET

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

The Shimano BB-RS501 bottom bracket mounts a 24mm spindle crank to road bike frames with threaded bottom brackets. Depending on the version, it is a BSA or ITA bottom bracket shell with a width of 68mm or 70mm. Shimano recommends BB-RS501 for the Tiagra, Sora, Claris, Alfine, GRX RX600 series cranks and for a number of non-group models. It presents an optimized joint design that prolongs its durability. The bearings are made of steel and the cups are made of anodized aluminium. In combination with the corresponding crank, this bottom bracket guarantees stability and efficiency with each pedal stroke thanks to Hollowtech II technology.
Specifications:

Scope:
     Road, Cyclocross, Gravel, City
Fixing Type:
     BSA, ITA
Bottom Bracket Shell Width:
     68mm, 70mm
Shaft diameter:
     24mm (Hollowtech II)

Technical data:

Bearings:
     Steel
Bottom bracket cup material:
     Aluminum

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

Characteristics:

     anodized cups
     improved joint design
     Long useful 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 lower bearing and the right crank arm and works with a 24mm diameter spindle or bottom bracket, which has proven to be optimal in terms of stability. In many cases, the bearing cups are on the outside for better load distribution. In addition, high-quality precision gaskets are added to ensure a long service life.
Models:

BSA:

Bottom Bracket Shell Width:
     68mm
Manufacturer number:
     EBBRS501B


IT:

Bottom Bracket Shell Width:
     70mm
Manufacturer number:
     EBBRS501I

Shipping volume:

Shimano BB-RS501 bottom bracket, consisting of:

     1 x right cup with bearing
     1 x left cup with bearing
     1 x Bottom bracket bushing