grant mills

I have an '84. It had michelins on it when purchased. I forget the size...but I discovered that my speedo was 10% faster than actual speed. After some calculations I switched to 225/70R15 (Comp T/A) rear and 225/60R15 front (because 225/70 rubbed the front inner fender well on strong cornering) It is now time to replace them and I am looking at 205/75R15 as they are closest in radius and will make tire rotation easier.

My face is red. I blame old age, dim garage, need for glasses.....the tires are actually 225/70 rear, 225/60 front and easily sourced. My confusion arose because (due to some garage being kind and rotating front to rear unbeknownst to me) I was thinking that the 60's were 80's, since I could make out that the front were 70's and I knew that the rear were larger. The reason for the different sizes is still the same, but now it is no longer an issue to source them.

Years back I discovered that the standard Michelin tire on my car were too small, causing my speedometer to read 10% too high. I calculated and found a tire size 225-80R15 (Comp T/A) that brought the speedo to an accurate value. But it turned out that this size caused fender rubbing on my front tires as I turned corners (even at slow speeds) I solved this by putting 225-70 on the front. (and I had an additional slight rake to the car which I liked) Now it is time to replace the tires and I can't find the 225-80 anywhere. I would go back to the original sized tire, 215-60R15, if I could replace the gear that drives the speedometer.....but I don't know where or how accessible that gear is. Otherwise I need to find a tire size that will keep my speedo accurate. Any ideas??