Guys,

Just noticed this at Tirerack website.
http://www.tirerack.com/tires/tires....el=Autocrosser

Hoosier Autocrosser only one size now.

 

I think those are bias ply tires?

 

Yeah, it looks like the tread pattern for their bias ply tires. Check the Hoosier website:

http://www.hoosiertire.com/rrtire.htm

Navigate through the road racing tires to the "Sports Car DOT - Bias" tires, and click on tread type "I".

 

I think there are two types...
This is what Tire Rack said:
"If your sanctioning body requires a D.O.T approved tire and you prefer the view from the front of the pack, Hoosier has a tire for you. Their bias-ply tire has been dominating for years. Predictability, grip, and very low weight add up to be a winning combination. Available in either the Autocrosser for Solo II, or the Street TD for Road Racing"

 

I think that Tire Rack is telling you it's a bias-ply tire.

 

That pic is Hoosier's old bias ply tire. I have not seen a set on a car in years; nobody bothers anymore. The current radial tires are much, much better.

 

Oh I see....I thought its new tires again...
What is the difference between bias ply and radial? Is this the structure of the tires?

 

Yes.

Bias ply versus radial tire

 

POS