Choosing tires

is always an interesting challenge.  The best sizes (that match the original cars' profiles) do not offer many high-performance choices.  With 15" wheels (7.5" and 9.5" wide), we recommend:

Front: 235/60-15 (245/60-15 after chassis 731)
Rear: 295/50-15

Other possible sizes (including 16" and 17" rims) are listed here.

Some Tire Sources

Technical information

Speed Ratings

In the USA, since you will never excede the legal speed limit Wink, speed ratings shouldn't be a primary factor in tire choice.  But, it's nice to have a little safety factor anyway.  As you search through the tire distributors' offerings, you will find that only Avon tires have a V speed rating.  All the others are rated T.  

Currently the available brands that offer both sizes include Avon FIA Rally CR6ZZ DOT (V-rated), BF Goodrich Radial T/As,  Firestone Firehawks, and Goodyear Eagle GT IIs.

There may be others, so it never hurts to search around.

Speed ratings

S = 112 MPH, 180km/h
T = 118 MPH, 190km/h
U = 124 MPH, 200km/h
H = 130 MPH, 210km/h
V = 149 MPH, 240km/h
Z = 149 MPH, 240km/h and over
W = 168 MPH, 270km/h
Y = 186 MPH, 300km/h