Service - 157Trail bottom bracket & crank compatibility
With our new 157TRAIL rear end the chainline on the Fugitive and 2020 Warden is in the 55-57mm range with 56.5mm being optimal. There are a number of ways to get cranks to fit our frames so here are some helpful facts.
- SRAM's new DUB system comes in two versions. Regular and SB+. The regular version works on the Fugitive but you have to switch to a zero offset chainring (see below). The SB+ version has a bottom bracket, cranks and chainring combination that works perfectly on the Fugitive. The X01, GX, and Descendant 7k DUB SB+ cranks have a longer axle and a wider BB spacer that works with 157TRAIL. All the DUB BB's are the same.
- A standard SRAM crank with a zero offset chainring - One-Up and Chromag both have a great option - will work but it does limit the largest ring size on the front to 32t.
- Any direct mount Raceface crank with a flipped Direct Mount ring will work. Raceface rings come with a 3mm offset so when the ring is removed and flipped (the teeth profile works like this as well) it becomes a -3mm offset and the chainline works on the Fugitive. For a 1x system you can run a flipped ring on the Next SL, Next R, and Turbine cranks with a 134mm axle, or the Atlas and SIXC with the 136mm axle, or the Aeffect and Ride Cinch cranks with 137mm axle. For a 2x system you can run the Next SL, Next R or Turbine with a 143mm axle and a Boost spider. Please check out this diagram from Raceface for more information.
- Shimano offers their cranks with a +3 option (the part number should have a "B" on the end like this: FC-M8000-B). The axle length and BB are the same as their standard cranks so the offset is worked into the chainring mount. This system will work as both a 1x and a 2x option on the Fugitive. NOTE: this set up requires one spacer between the BB and the frame on the drive side. Maximum size chainring is a 32t ring with this setup. The XTR, XT and SLX cranks in this configuration work on the Fugitive.
- FSA has 5 different MTN cranks that work with our 157TRAIL rear. Their system is very simple - you simply move one spacer from between the crank and the spider to between the spider and the BB to provide the right chainline.