Originally Posted by Steve_sr

Hello,

I have a gravel bike with a 2X GRX810 setup. I am going on a trip to OZ (NZ) early next year and am looking for lower gearing for some of the steeper sections.

My first thoughts is that I need to get a larger cassette on the back. However, I have the RD810 RD which is only rated for a 34T max cog. It also has a maximum capacity of 40T.

So I start looking around and find that the RD812 has a max cog of 42 but with a total capacity of only 31T.

So what are your thoughts (real world data points would also be nice!) on the ability of the RD810 to handle a 42 or even 46 max cog and would a Goatlink be required? We'll talk about what to do up front later.

Thanks,
Steve