Absolute black gives the diameter of their rings at the bottom in general.
ie:
https://absoluteblack.cc/sram-oval.htmlIn the example above, between a 32 and 34 you have 8mm, so 4mm nearer the chainstay.
I run a 38 round on my 041 frame, and it is just about to touch the chainstay, without any problem of wear such as mud could do.