EK/PBR 420SR 13/43-124 Chain Kit - Standard Sprocket by EK CHAIN. A complete kit to replace the secondary transmission of your 50cc or to restore a small urban sportbike. It includes a sprocket, standard sprocket, and 420 SR chain with 124 links for direct and secure installation.
The SR series features a design aimed at maintaining the flexibility of the chain even after long hours on the asphalt. The plates undergo a specialized heat treatment that enhances durability and wear resistance, without claiming unverified performance. This kit is delivered without sealing rings (O-rings), making it easy to maintain for intensive urban use.
- Color: steel / steel
- Sprocket Material: steel (standard)
- Pitch: 420
- Number of Links: 124
- Chain Type: SR (EK)
- Type of Seals: no seals
- Configuration: 13-tooth sprocket / 43-tooth sprocket
Ideal for urban use and maintenance replacements on small displacements — notably APRILIA RS 50 (1993-1994). Installation and adjustment by a professional is recommended to ensure proper tension and alignment of the transmission.
