Many if not most mountain bikers prefer 1x systems these days. These 1x11 and 1x12 drivetrain systems have introduced a new era of simplicity and reliability, freeing up dropper post lever real estate and opening up new frame design possibilities. Many will never go back to 2x systems, but the desire to have lower gears still exists, too. The e*thirteen TRS+ introduced last year was a success, with a 9-44t range. Now comes the new TRSr, which is the perfect evolution of the system, increasing the biggest cog to 46t.
The good news is that e*thirteen didn't just swap out the big 44t with a 46t. Rather, they changed the three top rings to 33-39-46 to maintain shifting performance. And to our surprise, the weight dropped to 303 grams (287 claimed) compared to the smaller TRS+'s 320 grams.
That weight number compares favorably to SRAM Eagle's 354-gram 10-50 cassette. Additional weight savings can be had with a shorter chain and smaller front chainring (to achieve the same gear ratio). It's also worth noting that the Shimano XT 1x11 cassette is quite a bit heavier at 441 grams, while the SRAM X01 10-42t 11-speed cassette is 255 grams.
Design and Compatibility
Using the SRAM XD hub body, e*thirteen was able to fit a 9-tooth since the smaller cogs are actually floating and not wrapped around the hub body. The trick was locking the cogs in place, and that's were e*thirteen designed an ingenious locking mechanism. The two cassette halves lock into each other with a design that's proven to be reliable over the past year.
We've taken this out on a couple rides and we're pleased to report that it performs as well as the TRS+ we previously tested. The 46t is most welcome, as it is an increase that can definitely be felt. The shift to the 46t is smooth with only a little tightening of the b-tension screw to keep the upper pulley from getting too close to the big cog. Shifts on the big cogs felt natural and even.
On the smaller cogs, the shift from the 10t to the 9t was smooth as well. It was a progressive shift that felt seamless while pedaling. The lone problem was the jump from 12t to 10t, which felt abrupt just as in all 10-42 systems. The 9t ring doesn't feel like the most efficient gear in the selection, but it definitely helps avoid the dreaded 'spinning out' on the commute back home from the trail.
Another pleasant revelation is that although we don't anticipate needing the 9t for our local trails, it allows us to reduce our chainring size without losing the high gear range of our old drivetrain. For example, we can drop the front from 32t to 30t and still be satisfied with the high gear. That saves weight, too.
- Gears: 9-10-12-14-17-20-24-28-33-39-46
- Compatibility: XD driver and Shimano 11-speed
- Weight: 303g
- Price: $349
- TRSr 9-46t 11sp: 511%
- SRAM Eagle 12sp 10-50t: 500%
- TRS+ 11sp 9-44t: 489% TRS+
- 10sp 9-42t: 467%
- SRAM XX1 11sp 10-42t: 420%
- Shimano 11sp 11-46t 418%
- TRSr 11sp 303g
- SRAM Eagle 362g
- Shimano XT M8000: 441g
And in case you were wondering install with the included tool and a single chain whip is fairly straight forward. And it will fit on XD driver body hubs as well, with no prying apart cassettes or modifying derailleurs.
For more info please visit bythehive.com.