Review | Forget 12-speed with e*thirteen’s 9-46t TRS Race 11-speed cassette

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It feels like 1×11 drivetrains have been around forever (go on, take a guess. No Googling mind. Answer* at the bottom of the review). I don’t think it would be too much of an exaggeration to say that they’ve revolutionised mountain biking. Riders have less to worry about when riding, cockpits have been tidied up, while designers have greater freedom in suspension design.

Wins all round then?

e*13 cassette 1x11
Wide-range cassettes have all but eliminated the need for a front derailleur.

Except that the range of the first 1×11 cassettes (SRAM’s 10-42t ratio) was somewhat small at 420%, compared to a typical double chainring setup that offered over 475%.

Several companies have extended the range of their cassettes by simply making the largest cog bigger.

For 11-speed drivetrains there was Shimano’s 11-46t cassette (418%), and SunRace’s 11-50t ratio (454%). There have also been various hop-up kits from the likes of Wolf Tooth Components and OneUp, which modify an existing HG cassette by boosting the range with a larger in-board sprocket, while taking a smaller cog out from the bottom half of the cassette.

With the goal of trumping the front derailleur completely, SRAM added a cog to the whole shebang to make it 10-50t with its Eagle drivetrain (500%). And now Shimano is ‘leading’ the way with the 10-51t ratio on its latest XTR groupset (510%).

e*13 cassette thirteen
The e*thirteen TRS Race cassette takes a different approach to SRAM and Shimano.

e*thirteen TRS Race Cassette

For the most part, everyone has been making the largest cog bigger, because there was no real way to make the smallest one any smaller, thanks to the pesky lock ring getting in the way. That is until e*thirteen joined the party and rewrote the rulebook.

The TRS Race is a wide range 11-speed cassette that offers a whopping 511% range. Even with one less cog, its vast range trumps both 12-speed SRAM Eagle and Shimano XTR.

Instead of upsizing to even bigger cogs at the low-end, e*thirteen achieves this range by simply shrinking the smallest cog to 9t.

e*13 cassette thirteen
The top three cogs of the cassette are machined from a single block of alloy.

Split-Block Design

To make this feat of engineering possible, the cassette is split into two gear clusters with the lock ring repositioned to the middle of the cassette body where it meets the threads of the SRAM XD driver. A special lock ring tool is (thankfully) included with the TRS Race cassette, which secures the large cluster down onto the freehub body.

The small gear cluster then mechanically locks into place on the large cluster with the aid of a chain whip. To unlock and remove, you’ll need a secondary chain whip.

Since the e*thirteen cassette is only compatible with XD drivers, existing Shimano drivetrain owners will want to check in with their wheel manufacturer to make sure they can source an XD option that’ll fit.

e*13 cassette thirteen
A special lock ring holds the large cluster onto the freehub body.

Less Grams

Overall it’s an ingenious and elegant solution, and the smaller cog offers numerous benefits – you can run a smaller chainring for increased ground clearance, and a shorter chain so there’s less chain flapping about. Consequently, the whole drivetrain can weigh a little less as well.

Speaking of weight, the TRS Race impresses at just 304g on the scales. That’s a lot lighter than the hulking SunRace MX80 11-50t cassette (526g) and Shimano’s 11-46t XT cassette (440g). Perhaps more impressive is that it’s even lighter than XTR 9100 (363g) and X01 Eagle (355g).

The larger cluster and lock ring are constructed from weight saving aluminium, while the smaller one is formed from high strength steel. The overall level of engineering and machine work is absolutely top notch, which it should be for over £300. Of note is that you can replace the large block (£129) and the small block (£209) separately.

e*13 cassette 1x11
You get a whopping 512% range with the e*Thirteen TRS Race cassette.

Bigger Jumps



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*Answer: SRAM introduced the 1×11 drivetrain back in 2012 with XX1. So now you know.


Review Info

Product:TRS Race Casette
Tested:by James Vincent for 6 months

Comments (7)

    Both Sram and Shimano agree that the polygon effect is too pronounced on a 9T sprocket. Your efficiency loss figs seem optimistic?

    I honestly can’t see the value in a £300 consumable when you could get GX Eagle for around the same amount. I was curious for my hardtail until I saw the price.

    Added to the fact that eagle and the new xtr allow a larger chainring that would potentially provide less chain influence on the suspension of most bikes than the smaller chainring route. (still on xt 11-46 with a32 tooth ring so not an evangelist)

    “In my experience Eagle is fantastic out the box, but every bike I’ve ridden with it (granted, these have all been [X01] Eagle drivetrains) has drifted out of tune over time and is incredibly sensitive to rear mech alignment and cable tension”

    – agree

    I would agree that 9 tooth is to small or tight to wrap a chain and keep efficient, but that’s just my thinking. Also why a 1 tooth jump between 9 & 10 , if your down that end then 1 tooth doesn’t make make much of a step difference, it would be better to spread out more I would have thought.
    Finally I do wish the % range figure hadn’t become ‘The’ number to chuck around in the gearing war, its probably the least important number – Gear Ratios are better as is the High and Low teeth count and the steps in between the middle, high and low ends depending on what riding you do. by way of proof that 1 tooth drop to 9 tooth makes quite a big difference in the % number but in reality very little difference in use (I would argue)

    “in order to take full advantage of the 9-46t ratio, you really want to be running a smaller chainring – ideally a 30t or even a 28t”

    Why? I don’t understand this statement. Surely it just depends on what gear ratios you want? I run a 1×11 system with a 10-42T SRAM X01 cassette and a 36T chainring. Using an online gear ratio calculator (on Sheldon Brown’s site) I was able to replicate almost the full range of my previous 3×11 setup, which is the main reason I made the change to get the weight saving and the clearer bike/cockpit. I’ve never used the largest cassette ring at the back, either.

    It would certainly be interesting to try a 9T cassette ring, although I guess it will wear out quite quickly and be more prone to chain skipping at an earlier stage of wear.

    My last experience of a cassette with more than one aluminium sprocket was to duly change the chain at 0.75% stretch and find one of the alu sprockets was too worn to use any more. So not paying £300 to find out if this is same!

    Also tend to agree this doesn’t have great MTB cog spacing – for road riding against wind resistance you want close ratios between the small sprockets, I find for MTB I’m more interested in closer steps when climbing. Sunrace and Sram seem to have it right to me.

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