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So in my quest to decide on which tires to get for my car when my new demon replica wheels arrive, I've been looking at doing Firestone Firehawk Indy 500 275/35-20 up front and Nitto 555r 305/35-20 in the rear.

Now the firehawk diameter in 275/35-20 would be 27.6" vs the stock 28.7" diameter.

I know people are getting the 275/40s (28.7 diameter as well) for a closer match to the stock diameter, but I dont like the fact that the front tire would be slightly bigger than the rear if I did the Nitto 305/35s which have a 28.5" diameter.

My question is will the 275/35s on the front tires throw off speedo enough to trip the CEL? or is it the rear wheels that read the speed?

Has anyone else done the slightly smaller diameter up front with larger in the rear and had any issues?

Thanks
 

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