am i just imaginining things or do some fb racecars have undersized wheel/tire combos?

or is it just an illusion created by a severely lowered car with wider than average wheels?

like this one:

 

lots of racers use 13 inch wheels, so it most likely isn't an optical illusion, less rotational mass, less weight, and higher RPM's are all good things

 

wel 13 inch wheels are stock wheels for my 85, so no, they are normal =)

 

this is why I said wheel/tire combos.

 

The tires are mostly likely lower profile than stock, while the wheel is stock sized

 

A perfect wheel tire combo for the auto-x it 13x8 wheels with very low profile tires the same size. it lowers the car substancially, and makes the tires stick out the sides about an inch.

 

In SCCA IT7 or ITA which most first gens run in the max wheel size is 13x7. In ITS you can use 14x7 I think.

 

You are not imagining things. Many people run tires with a significantly smaller outer diameter. It does make the cars look a little funny.

The picture shown is an SCCA Improved Touring race car. The class it runs in, IT7, is a regional class supported in some divisions (Southeast and Central most notably) and is based on the ITA class rules which allow an up to 7 inch rim width and the original diameter (for a 12a car, 13").

The 13b first gens run in ITS, and also are based on original diameter (14" in this case) and up to 7 inch rim width.

Also, the cars are allowed to be lowered to a minimum 5" ride height measured at the bottom of the rocker panel.

Regarding tires, Hoosier R3S03 are generally the preferred tire for ITS and ITA / IT7. On my car I run 225/45-13 which has an outer diameter of 20.7" compared to the stock 185/70-13's with an outer diameter of 23.2" - 2.5" taller.

 

I'm running 185/60-13's on the stock waffles. I really want to get some 13x7's with RA-1's for track events. Mmmm R-Compound.

 

My BFGs are much better than the 185s I had prior. They lowered the car and stick better thanks to the wider contact patch. The wheels are Cheviot 13x7s.






Toughguy

 

I ran 13x7 with 225/50/13s on 3 races.

I just recently switched to 15x6 wheels with toyo proxes ra1 tires and a new suspension setup. It performs better than with 13s.

with the 13s I had a harder time controlling the car due to the bad tires I ran with, but the lower center of gravity helped a lot.

 

here...with 13"

 

Sweeeet. I ran on 205/60-13 Comp T/A's for the longest time, fun tire. I really need to get away from the 5.5" inch rims, those Cheviot's look nice. Where'd they come from Toughguy?

 

I saw them for sale used in Ottawa at a Mazda shop. They were straight and the price was right.

Toughguy

 

13x8" 235/45-13 tires

 

Smaller wheels?
You mean like these?

 

Holy cow! Those are like 10 inches! Making a 3/4 midget RX7? LOL.

Toughguy

 

haha, those wheels look really cool. where can i get those? would they fit my sa?

 

lol, sorry for the little bit of perfidy, that wheel is actually a 10" modular racing wheel for those tiny Honda 600s.
Cute little sucker though, ain't it? It weighs five whole pounds!

 

Here's me sitting behind my car with 13x8 diamonds 4" backspace all corners. 225/45/13 Hoosier DOTR's on front and 21x9.5x13 Hoosier slicks on the rear.

 

ooohh... where did you get the wheels, drivefast7? and what kind are they?
as for the front lip, did you make it yourself or bought it from somewhere?

 

oh ok, i spoke with you at the show, now i know who you are!!! your car is bad ***! i liked you heat shield you made to block the heat away from your lakecities intake...

 

How do you like your Kumhos?

 

www.diamondracingwheels.com

The dam is a Xenon. BTW, nice meeting you Brad!

 

they work good for the price, but they're obviously not teh best of the best out there...

I used to run A3s03's but then I started throwing in a couple road racing days on top of my autoX, so I got some tires that serve dual duty..

For what they are, I couldn't have picked anything better...


And my wheels are from diamondracing.com as well