e13 TRS cassette with 9tooth cog and unique mounting system

When SRAM started the 11speed movement, they redesigned the freehub body so they could offer a smaller 10 tooth sprocket.

e13 designers have taken things a step further to allow a tiny 9tooth sprocket, which offers a range similar to a twin ring set up! They also offer a 10speed version, which can be upgraded to 11 speed.

The e13 TRS cassette has a tiny 9tooth sprocket, but no lock ring like the Shimano system, and no locking internal sleeve like the SRAM system.

Here’s the full specs of the cassette:

1. 10 speed range –  9, 10, 12, 14, 17, 20, 24, 28, 35, 42
2. 11 speed range –  9, 10, 12, 14, 17, 20, 24, 28, 32, 38, 44
3. Required freehub – SRAM XD driver
4. Drivetrain compatibility – works with all Shimano and SRAM 10/11 speed
5. Weight – 300grams (10 speed) and 320grams (11 speed)

The e13 TRS cassette mounts on to the SRAM XD driver using a crafty bit of design.

The e13 cassette is made up of three parts – the steel lower cassette; the lock ring, and the outer alloy cassette.

The outer alloy part of the cassette locates on to the SRAM XD driver, and is tightened by the lock ring, using a supplied tool. The lower steel part of the cassette then locks on to the alloy outer part using a conventional chain whip.

The smaller steel part of the cassette locates on to the alloy part, and locks in to place.

The lower steel part of the cassette simply pushes on inline to the unlocked marker, and is tightened with a chain whip. This locks the cassette in place in the direction of pedalling.

We’ve put the e13 cassette straight on to a test bike running a SRAM drive train, and have already been out in the mud testing it. When we’ve put some decent miles on it, we’ll report back with a full test.

What do you think of the e13 concept?

Let us know in the comments below…

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