Hey Sherwan
The figures written on the stock rim of my 1328cc jimny are 15x5-1/2 JJ 3.008/5/55JK 026. I know that the rim size is 15 inch in diameter and the width of the rim is 5.5 inches. I have no idea what the rest of the **** is but am sure it must be about the lug nut sizes, the distance in between ect. Stock tyre size of Jimny is 205/70/15. I have used 225/70/15 for offroading on 660cc jimny and used to rally on the 1328cc jimny with 195/80/15.
Both sizes in both Jimnys never bothered at all, even at high speeds.