Rohloff Splined Carrier Slim – Splined sprocket adapter with snap-ring
The Rohloff Splined Carrier Slim (8540S) is the narrower splined sprocket adapter with snap ring for the SPEEDHUB 500/14 – it moves the chainline 2 mm inwards compared with the standard carrier, for frames where the standard chainline does not work.
Why the slim carrier?
Chainline 55 mm. With 135/142 mm hubs the chainline is 55 mm (73 mm on 170/177 mm hubs) – 2 mm inboard of the standard carrier. 
For 15–21T sprockets. Takes the reversible Rohloff splined steel sprockets from 15 to 21 teeth. 
Snap ring included. The sprocket is secured with a snap ring, so sprocket changes stay quick. 
Every SPEEDHUB can be upgraded. Rohloff states that every SPEEDHUB 500/14 can be converted to the splined carrier system.
When the chainline matters
A straight chainline means quieter running and less chain wear. If your chainring sits further inboard, the slim carrier brings the sprocket in line.
Who is it for?
- Riders fine-tuning the chainline. When the chainring sits slightly inboard of the standard line.
- SPEEDHUB owners converting to splined sprockets. Choose slim or standard to suit the crankset.
Compatibility
| Rohloff part number | 8540S |
|---|---|
| Sprockets | Rohloff splined sprockets 15–21T |
| Chainline 135/142 mm | 55 mm |
| Chainline 170/177 mm | 73 mm |
| Retention | Snap ring (8539) |
Frequently asked questions
Can I use a 13T or 14T sprocket on the slim carrier?
No. Rohloff lists the slim carrier for 15–21T sprockets. For 13T and 14T use the standard carrier 8540.
Which tool do I need to fit the carrier?
A chain whip, a 24 mm tool and the Rohloff sprocket remover that matches your hub spacing (e.g. 8501 for 135/170 mm, 8508 for 142/177 mm). Our workshop can do the conversion for you.
Does it work with a Gates belt?
No. Splined Gates Carbon Drive sprockets need the Lock carrier 8540L.
About Rohloff
Rohloff AG is a German engineering company based in Fuldatal near Kassel. Its SPEEDHUB 500/14 is a sealed 14-speed gear hub with evenly spaced gears, built for riders who want a drivetrain that keeps working for tens of thousands of kilometres with little more than an annual oil change.
BoodaBike in Budapest is an official Rohloff service centre, trained by Rohloff, and an official European distributor of Rohloff hubs and spare parts. Every part we sell is genuine Rohloff, and we are happy to help you find the right part number for your hub.