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Originally Posted by nazrat
You can also have the same effect by installing larger tires. I ran the biggest tire that would fit in the wheel wells in my 83 300D. They were large enough that the speedo was significantly off (80mph speed with the speedo at 65). It drove very well though and did increase the fuel economy.
-Tad
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The stock tire is 195/70/14.
I currently run 215/70/14's on the SD.
I might guess that you could possibly run (but possibly not) 235/70/14's.
The difference between this huge tire and stock is 9.3%.
When your speedometer reads 65mph, the vehicle is travelling 71 mph.
You cannot come anywhere near the effect of a 2.47 rear with a change in tires.