GRX crankset query

[Lostcause]

Does anyone know if GRX crank arms are the same on 1x and 2x? I have some 170 cranks which are the perfect length for me but they are 2x. Is it simply a case of bolt on the desired size of 1x chainring ?
Thanks in advance…

 

[Sharky]

I'm pretty sure that it is a simple case of fitting a new chain ring. Try and get a narrow/wide chainring when you do. Helps to stop the chain from escaping.

 

[wafter]

The Shimano diagrams for the 810 and 820 seem to imply the same crankset is used for both 1x and 2x applications..

 

[ColinJ]

When I turned a Shimano setup into a 1x, I had to buy a set of shorter chainring bolts and some washers to compensate for the missing ring. Without them I couldn't tighten the bolts to hold the single ring in place.

 

[ColinJ]

I probably should have bought a narrow/wide chainring because the bike started dropping the chain on a regular basis after the conversion. I fixdd the problem by using the redundant front mech as a chain guide. (No cable attached, just held in position by one of the endstop screws.)