What width of wheel can I get away with running 2.1 tyres?

 Need a new back rim but not sure what ti get

cheers 

What rim do want super narrow or super fat? I'm guessing running 2.1's you're not getting massive fat DH rims so in that case you'll be fine with any rim I'd have said.

I've had 2.5's on 17mm rims which was a little "rolly" but they never popped off or snakebit.

Wider you go the more you risk it pinging off and you'll find more noticable tyre roll depending on how 'tall' the tyre is.

2.1 is a very average width I wouldn't worry.

23.5 ok then?

fancy trying sun ringle