>I may be wrong, but shouldn't a '66 Imperial have 235/75R15 tires?
235/75R15 is the closest radial in diameter to stock bias ply tires. You
can play around with other wheel sizes and go a few percentage points up or
down from stock outside tire diameter, so a 70 will work. As I pointed out
in my message with the link, you need a different speedometer pinion gear
for different diameters. The other thing you should consider is adjusting
the suspension for the change in ride height.
-- David
'91 K-Imperial driver (14-inch radials)
'66 Crown Coupe project (gonna get 15-inch BFG bias ply)
'66 Newport 383 4bbl .030 over Eddys/Hurst/Cragars dual exhaust daughter's
first Mopar (drag slicks, hee hee hee)
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