rims and tires

[rubicon500kid]

ok i got deltas and i have 12.5 inch wide tires on all 4 now i have my deltas for the back on the front because the fronts have a spacer that made it from a polaris rim to a honda bolt patern and   they wont work on the front because of the brakes so i have the fronts in the back will that cause any problems ?

now my second Q is if i get new tires which would be 25-8-12 and 25-10-12 mudzillas would the 8 fit on the back rim which is in the front of the bike  and the 10's fit on the front rims wich is on the back of the bike?

now my third Q is if i get stock forman rims wich r 12 would the 12.5 fit on them without rubing or no?

[TRX450R_Racer]

Tire sizes go like this 25-10-12. The 25 is how tall the tire is 25". The 10 is how wide the tire is 10" wide. The 12 is the size of the rim. It is 12" in diameter. There is also one more dimension you have to consider is who wide the rim is.
Answer to Q 1 is NO
Answer to Q 2 is You need to see how wide the rim is first.
Answer to Q 3 is the 12 number you gave is the diameter of the rim. The 12.5" number you give is the width of the tire. Those two have nothing to do with each other. the rim size of 12" like you stated has to be equal to the last number in the tire size so it will fit on the rim. The 12.5" numberr has to be compaerd to the width of the rim. You can put tires wider then the rim no problem. The rims on my 450 are 9" wide and my tires are 11" wide, but like I said the rim size must be the same as the last number in the tire size.

[rubicon500kid]

ok thanks but i know how to classife the rims and every thing i was just makeing sure if i get new tire i dont need new rims