Rohloff Splined Carrier Standard Lock – Splined sprocket adapter with Lock-ring
The Rohloff Splined Carrier Standard Lock (8540L) is the splined sprocket adapter with lock ring that a SPEEDHUB 500/14 needs to run a splined Gates Carbon Drive belt sprocket – the base of every Rohloff belt drive.
Why the Lock carrier?
Lock ring instead of snap ring. The Gates sprocket is clamped with a lock ring – Rohloff requires the Lock carrier for Carbon Drive sprockets. 
Belt line on spec. 55 mm (±1 mm) on 135/142 mm hubs, 52 mm (±1 mm) on 148 mm Boost and 73 mm (±1 mm) on 170–197 mm hubs. 
Fits every SPEEDHUB. Every SPEEDHUB 500/14 can be upgraded to the splined carrier system. 
Clean and quiet. Belt drive plus SPEEDHUB: no chain oil, no derailleur – the low-maintenance drivetrain many BoodaBike customers ride.
Belt drive specialists
We build our own belt-drive bikes with Gates Carbon Drive and Rohloff in our Budapest workshop. Tell us your frame and chainring and we will check belt line and sprocket size before you order.
Converting from chain to belt
To switch a SPEEDHUB from chain to Gates belt you need this carrier, a splined Gates rear sprocket, a matching front sprocket and belt – and a frame that can be opened for the belt.
Who is it for?
- Riders converting to Gates Carbon Drive. The required carrier for a splined Gates rear sprocket.
- Frame builders and workshops. The standard part for SPEEDHUB belt-drive builds.
- Belt riders replacing a worn carrier. Genuine Rohloff replacement.
Compatibility
| Rohloff part number | 8540L |
|---|---|
| Sprockets | Splined Gates Carbon Drive sprockets |
| Retention | Lock ring |
| Belt line 135/142 mm | 55 mm ±1 mm |
| Belt line 148 mm Boost | 52 mm ±1 mm |
| Belt line 170–197 mm | 73 mm ±1 mm |
Frequently asked questions
Can I use Rohloff steel chain sprockets on the Lock carrier?
The Lock carrier is specified by Rohloff for splined Gates Carbon Drive sprockets. For chain sprockets use the standard 8540 or slim 8540S carrier.
Do I need special tools?
Yes: a sprocket remover matching your hub spacing (8501, 8508 or 8509), a chain whip and a 24 mm tool. Our Budapest workshop can fit it for you.
Which belt sprocket sizes are available?
Gates offers several splined rear sprocket sizes for Rohloff. Ask us – we stock Gates Carbon Drive parts and can calculate the gearing.
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.