17/65-15

17 cm tread width ( 6.7" )
65 cm outer diameter ( 25.6" )
15 in diameter wheel

There is no direct correlation between this sizing and street tire
sizing because rally tires go by tread width and street tires go by
maximum width, but I would estimate that a 17cm tread would be
equivalent to 195 or a 205, so this would be about a 205/65-15 by
street tire sizing. I am sure that someone with an actual measurement
could correct the above numbers, but they should be reasonably close.

Matthew

...........................................................


I have been studing tires for a while now and am no ways ready to call
myself any thing close to expert but here are some things I have learned. 

The Surface plays a huge roll in the tire selection. I have run sets of
stages where I started the later stags with basicaly no tread and found a
soft compound tire on a solid abrasive surface is not bad. 

Gravel seams to be a surface all tires work on well no mater the compound
and the tread condition. 

Sandy, Dirt, and Muddy section care a lot about the condition of the
tread. It appears the sharpness of the blocks is more important to the
performance than the depth to a point. 

Harder surffaces like old established mainline roads seem to be the most
sensitive to compound choice. 

I hope others will chime in with thier experiance as this is an important
subject that I think is kept to quiet.

Derek