[V8] DTM wheel size

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216/60 15 = 25.15dia     5.07in rim to ground  -0- 3.89  gear ratio
255/35 18 = 25.02dia     3.51in rim to ground  3.91  effective gear ratio
255/40 18 = 26.03dia     4.01in rim to ground   3.76 effective gear ratio
255/40 17 = 25.03dia     4.01in rim to ground   3.91 effective gear ratio
225/50 16 = 24.85dia     4.43in rim to ground   3.94 effective gear ratio
 
The 18-40's would make a slower car, the 18-35's is getting close to the  
ground for a 4000lb car...   I found even the 255/40 17 cost about  2mpg highway 
and were slower off the line.  I'd look at lightweight 17's as  my first 
choice, then a lightweight 16 setup as second.
 
HTH

Scott Justusson
 
 
 
 
In a message dated 4/9/2007 3:55:46 P.M. Central Daylight Time,  
David.Coleman at blackrock.com writes:
Scott, your concern is the same as mine  -- both unsprung weight and
susceptibility to damage.  Plus the car's  lowered w/ H&Rs, and the ride
would certainly be more harsh w/ 18s.   I have essentially no clearance
issues w/ the 17x8s as is, and if I do go  18s, will keep overall tire
diameter as close as possible to the 215/60-15 OE  size.  The weight IS a
killer though.

-dc-
 



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