Shimano GRX 1x chainring size limitations.

[RDY]

Shimano only sell 40T and 42T, but can you put a 46T on?  Or will that cause issues with the default 11-42 cassette?

[cst_jpr]

https://www.reddit.com/r/gravelcycling/comments/dzumv8/can_you_run_a_grx_1x_with_1146_cassette/
https://www.bikeforums.net/cyclocross-gravelbiking-recreational/1191447-shimano-grx-rd-810-11-46t-cassette-possible.html (RD?)

[ryapad]

As long as you only have one chainring up front, it can be any size you want. You'll have to get a longer chain or do some quick link magic to make it work. Also, make sure a larger chainring will actually fit on your bike before you buy.

[tripleDot]

For a 1x setup, I don't see why not. The limiting factor would actually be your chainstay. Usually, if you got clearance for wider rear tire, the chainring clearance would have to give.