largest tire on 14" rally wheels

So, here are a couple of fun facts about this question!!!....

First, all stock small bolt rallye rims are 5.5", no exceptions! This is the parameter that I used to answer the question above!

Next, to accurately answer the question above, one must know how to accurately read the tire size code! Not saying most of all people don't know how but just including the information!

The first number, 205 in this case, is the width of the tread in millimeters, or 205mm!
Next is the height of the sidewall in comparison to the width of the tread! In an example given above, "70" is equal to 70% of the width of 205mm, for a sidewalk height of 143.5mm!!

Next is obviously the diameter of the rim, in this case 14"! And of course the "R" stands for radial tire!

So, in answer to tis question would be that the "recommended" tread width of a tire for a 5.5" rim would be 205mm, or 8.07".

Hope this helps!! Geof