SRAM nerds: advice needed

I have a 'gravel' bike with SRAM rival 1 x 11.
11-42 cassette. Which spends more time doing road miles.

I want to put 1 x 11 on my mountain bike and be able to swap the wheels over to my gravel bike, so I can keep 700c road tyres on my 'gravel' bike.

Which SRAM mtb systems can I use that are compatible with rival.

I heard everything is compatible, but just want to be sure.

Also would like recommendations on good value for money SRAM mtb cassette/derailleur

Hopefully the right place for this. Have a Red22 chainset (hidden bolt). Ordered some SRAM chainring bolts for it. They are the ones where the threaded bolt goes through both chainrings, via a collar washer/spacer and threads directly into the crank.

My problem is that the bolt appears to be too long and the thread bottoms out. So I'm in wavy chainring / front much cage rubbing city.

Any advice?

all SRAM shifting is 1:1 actuation ratio which basically moves for every 1mm of movement the shifter does, the cable moves 1mm, long story short, everything is cross compatible.

You’re using a washer with it too?

Exact Actuation won't work with some 11 speed X Actuation mtb stuff

i didn’t know that, thanks! it’s been a minute since i worked with bikes.

Please check SRAM comparability charts on website. All items labelled Exact Actuation are compatible in their family (10spd/11spd) but those not marked Exact Actuation do not/have limited cross compatibility

11 spd MTB systems that appear to be compatible are:
https://www.sram.com/sram/road/products/sram-s-700-11-speed-trigger-shifters

https://www.sram.com/sram/road/technologies/exact-actuation

Or this:
https://www.sram.com/sram/road/products/sram-apex-1-11-speed-flat-bar-shifter

Also SRAM 11 speed cassettes (NON XD driver body) fit on 9/10 speed hubs too. The largest two sprokets are dished toward the spokes meaning the width of the cassette body does not increase for 11 speed. So you can have a wide utilisation of older MTB wheels too if you wish.

Its good stuff, I revamped my dad bike with 11 speed rival with an 11-42 cassette, I was able to add the PG-1130 cassette to my old 9 speed 105 hubs
https://www.sram.com/sram/road/products/pg-1130-11-42t-cassette

Yep. The one that came with the chainring bolts.

@errm_rich hero! Thanks