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Old 05-09-21, 11:24 PM
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Badger6
Obsessed with Eddington
 
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I am definitely biased toward my big ring, and frequently climb with it if the grade is consistent and below 7-8%. I need to do a better job of remembering that not everyone else does the same...I never rode in that spot, but I see what you mean by pulling up a terrain overlay. The upside is that those climbs and descents all look to be between 10-20m total, which is quite short (this is good news!).

To your original question, and as I stated above, the GRX RD will not work with a 2x chain set. There is an older Shimano MTB RD, the RD-M8000 with an SGS cage, that has a 47 tooth capacity (for an 11-42 cassette, that's 31T, plus the 16T of the 50-34 chain set) that works with up to a 42T big cog in a 2x set up. But, it's a MTB RD, and the pull ratio is different than your shift levers. Wolf Tooth makes something called a Tanpan that will adapt the pull ratio from your lever to properly index that RD, so you could run it....but that said, it'd be faster and easier to get a SRAM 11-36 (11 spd) cassette and try that first, with the only adjustment necessary to make it work is to adjust the b-screw...yes, the 36T low cog is outside the Shimano spec, but it's only 2T outside (both in terms of max cog and capacity) and Shimano is known to conservatively spec their equipment, real world testimonials indicate that the 11-36 will work fine.
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