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New Rubber...

1st Vette doesn't even own a C8 yet, let alone having a willing little Italian to pump, male and/or female.

Come on, let's try to keep this on topic. I don't want to have to call in Nik...

Oh but he will very soon ... however I can see how he may have misinterpreted

should have said .... Beautiful American riding on quality Italian rubber ........

 
Don't know the offsets of your wheels but here's basically what Jack did on the rear:


Does C8 cars automatically adjust speedo and odometer readings to account for the larger rolling diameter of the new setup? Your speedo reading is now off 2.5% vs. factory on the lower side.
 
The new wheels are 20 x 12 and yes the offsets are different than stock, off hand I don't know what it is. I was running the 305's on the 12" wheel and yes they where stretched. I'm aware of the discrepancy in the speedometer. It's only 2.5 km/h per 100. I'm happy being on the low side rather than the high side...
 

Anyone know the diff in the speedo for a 21/20 setup ?
 

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