Shimano’s gravel-bike specific groupset, GRX Di2 12-Speed, is superb. While Shimano have some of the best electronic shifting systems on the market, the company has always been a little conservative. One example is the recommendations of maximum cog sizes with their derailleurs.
The recommended maximum cog size for 12-Speed Shimano GRX Di2 & Mechanical 2x is 36 teeth. However, the GRX 2×12 rear derailleur cage appears capable of handling bigger cogs. Thus, JOM of the Gravel Cyclist crew got tinkering and set about debunking Shimano’s gear limits on GRX. Will GRX Di2 2x shift a 48/31 chainring combo paired to an Goldix branded 11-40 12-Speed cassette? (Cassette available from aliexpress).
Important: Shimano does not support or recommend the cassette configuration shown in this video.
Shifting Big Gears with Shimano GRX Di2 12-Speed Video
Alternative Video Link for those reading via email subscription
In this video, JOM of Gravel Cyclist tinkers with a Goldix 11-40 12-speed cassette, and Shimano’s excellent GRX Di2 12-Speed drivetrain.
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Links of Interest:
- Shimano Gravel Website
- Shimano GRX 12-Speed Di2 No BS Review
- Shifting Big Gears with Shimano GRX: 2x 48/31 with 11-40 XTR Cassette
- 2023 Rock Cobbler 10.0: Bakersfield, California
- How to Create Amazing & Fun Gravel Routes!
- Gravel Cyclist’s Route Library
- Gravel Bike Tire / Tyre Pressure Recommendations
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