fat bike. ring ?
 

possible broken tooth on ring
28 ring
aeffect crank arm​

https://cimg9.ibsrv.net/gimg/bikefor...0d0f6b5c3f.jpg
as u can see one tooth gone however all still works fine for now
question
do i need to replace whole crank armor is ring separate from crank arm
should all teeth be there?
thanks
https://cimg7.ibsrv.net/gimg/bikefor...ef0ce60e6d.jpg

​​​​​

Although a missing tooth is nothing that will hinder you to arrive to your destiny, it might derail the chain eventually. I'm more concerned on the wear that's apparently on the other teeth, as many appear on the picture to be "shark fin shaped"; this wear will eat through chains and probably end up shearing off/ loosing more of them. According to RaceFace, the Aeffect has a removable Direct Mount chainring so, no need to change crankarms. Here are pictures of a new crank/chainring combo and chainring (both from the RaceFace page). Maybe someone more knowledgeable will chime in with more info. or other alternatives. Good luck.
https://cimg2.ibsrv.net/gimg/bikefor...4181e3783c.jpg
https://cimg0.ibsrv.net/gimg/bikefor...aa7fd5c7ae.jpg
https://cimg3.ibsrv.net/gimg/bikefor...abc79f2726.jpg

thanks very helpful looks easy to replace

the one u mentioned is that the correct one i should be getting?

Sorry for my late response; the ones pictured is from the RaceFace'swebsite. The best best will be for you to call/write RaceFace and ask directly to them, as I'm unfamiliar with your specific model. Also, you might look around the crankarm for a model number/date of manufacture and/or, remove the driveside crankarm and look for a model number on the chainring/spyder. With this info., you can order your replacement. Here's the RaceFace links.
https://cimg1.ibsrv.net/gimg/bikefor...647783a16e.jpg

thanks again

my lbs is out of 28t ringsthey have 30t
would i see much difference going to a 30 compared to 28t

Check here:

https://www.bikecalc.com/gear_inches

What should be the average price for one of those?
would $150 be too much just for the one ring?