Reply to "tire size and speedo error"

I would call a good speedo shop that has a rolling dyno, they can regear the speedo gauge to the right speed for less than a few $$ I know there is a few in L.A.that can do it.You should not have more then 10mph with the tire change, I would also check to see if your 90 deg. drive on the ZF has the right number to match the speedo. If you have a 1.1 ratio on the 90 deg. you should have a 1610 rev speedo or you should have a 1.1:1 90deg. to a 1210 rev speedo