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1X Gravel and Adventure-Road Setup

Teal bike with 1x drivetrain setup, mountain view

We've logged a lot of gravel miles preparing for races and rides like Almanzo and The Mid South, and we wanted to share the details of the 1x (single front chainring, pronounced "one-by") drivetrains we use. As with mountain biking, 1x allows you to eliminate the weight and clutter of the front derailleur and cable without giving up the gear range of a conventional double chainring drivetrain. After riding 1x setups for several years now, we are thrilled with the performance, so 2x drivetrains for gravel/CX bikes are a thing of the past.

Below you will find some considerations on gear range, help on chainring size selection, and the best 1x setups for both Shimano and SRAM drivetrain systems.


Gearing Range Improvement

Here is a plot showing what gearing (and thus speed) ranges the RoadLink and Tanpan enable with Shimano drivetrains. These numbers also apply to the SRAM setups described below with the same gearing.  
  • The 2x setup on the far left would be "typical" 2x gearing. Note how much gearing overlap there is with this setup.  
  • The second setup from the left is a 2x wide range with the RoadLink or Tanpan (note with Tanpan, you can even do an 11-40 cassette with 2x for a super wide range!) 
  • The right 4 are 1x options that cover most or all of the usable gear range for All-Road or Adventure-Road riding.
All Road gearing options and speed range chart using Wolf Tooth RoadLink or Tanpan


Chainring type and size selection

  • Wolf Tooth Drop-Stop® chainrings have the widest range of fitment options for Road/Gravel/CX including both round and elliptical chainrings.
  • We found that 40T front chainrings work great for the rolling hills in Minnesota
    • 42T or 44T if you need more top end speed
    • 36T or 38T if you want a smaller climbing gear
  • Most people over gear and select too big of a chainring.  At a cadence of 100, your top pedaling speeds are as follows
    • 44 x 11 = 33 mph or 53 kph
    • 42 x 11 = 32 mph or 50 kph
    • 40 x 11 = 30 mph or 48 kph
    • 38 x 11 = 29 mph or 46 kph
    • Top speed numbers are from our gear charts and the 650b x 2.2 tire numbers are quoted above as that is roughly equivalent to a CX size tire.  Bigger tires would be about 1mph/1.5kph faster
Wolf Tooth 110BCD 40T 1x drivetrain installed on bike


Here are our 2 favorite Shimano setups: 

1. With our RoadLink you can use your 10- or 11-speed in a wide range cassette 1x application. The details of the RoadLink can be found here. This little engineering trick allows any Shimano road derailleur to work with up to an 11-40 cassette in 1x applications. As with the SRAM, sometimes we run an 11-36t cassette, but with hilly courses, we pull out the 11-40. With 11-speed, there are stock 11-36 cassettes (only offered by SRAM, but works great for Shimano here) and 11-40 cassettes.  Note that Shimano does not offer a road/CX clutch solution, but for gravel and all-road use the chain retention of our chainrings with non-clutch derailleurs is excellent. If you want extra security, a simple small chainguide can be added.

Wolf Tooth 1x drivetrain with RoadLink installed on bike for Shimano

Wolf Tooth 1x drivetrain with RoadLink installed on bike for Shimano close up

2. With the Tanpan, the range can get even wider than the RoadLink. The Tanpan allows Shimano 10- and 11-speed road shifters to work with 10- and 11- speed mountain bike rear derailleurs. This brings some very wide range options like 11-speed 10-44 or 11-45 modified cassettes. Additionally, mountain bike rear derailleurs offer better chain security when equipped with a derailleur cage roller clutch (Shimano does not offer this on any road groups). 

Wolf Tooth 1x drivetrain with Tanpan installed on bike for Shimano

Here is our favorite SRAM setup

SRAM 10-speed road shifters have the same cable actuation as SRAM 10-speed mountain bike shifters so you can use a mountain bike rear derailleur with road shifters. The clutch on the rear derailleur will help prevent chain suck when the lube is worn off your chain and also eliminate the annoying sound of the chain banging on the chainstay. A short cage derailleur works great with a typical 11-36T MTB cassette but a medium cage will be needed if you want the extra low range of a 40T or 42T GC. With respect to 11-speed, SRAM offers several 1x road/gravel options that work great with our Drop-Stop® chainrings on your current crankset.

Wolf Tooth 1x drivetrain with RoadLink installed on bike for SRAM
Wolf Tooth 1x drivetrain with RoadLink installed on bike for Shimano for SRAM

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