What size for autoX/track rims/tires?

[Option]

I'm planning on getting a set of designated autoX/track tires and rims. I know that a given set of tires will perform better on a larger diameter rim, but that larger rims are heavier so it increases unsprung weight and the tires will be more expensive. Does anyone have any experience/opinions on this? Oh, they will be going on an mazdaspeed (anyone know what the minimum rim diameter is to accommodate the msp's brakes?) Thanks

 

[scapamouche]

What class do you intend to autox in? If stock, then you need a 17x7 with offset of +49-+61 for SCCA.

If you're running in STX, then you can run any diameter, max width 8in. I think 15in wheels will fit, if you get the right offset, but I'm not certain...

 

[Option]

Yeah, I was planning on running in STX. Thanks for the info, anyone else?

 

[ARD MP5]

I would highly suggest the Rota Slipstream and Falken azenis 215/45/16. I believe this will be the ultimate setup on the P5. Cheap, lightweight, and very functional.

I'm gonna be getting quite a few sets of these if I can see what color people want.

Later, Rishie

 

[CRDMS1]

I too am VERY interested in a lighter, smaller wheel/tire combo on my Mazdaspeed for autox/track only. Mostly I want to save a little money on rubber and preserve the stock rims. A slight increase or no change in performance is highly desirable.

 

[scapamouche]

I would agree with ARD... If I was going to stay in STX, I'd probably go for that setup as well, or get a set of 15" Kosei K1s with Falkens...

As it is, I'm going to DS. I need a 17x7 wheel with +49-+61mm offset. Any suggestions, ARD?

 

[ARD MP5]

There are some options. I'm in negotiations with a company as we speak. Just waiting for their lighter options.

Rishie

 

[iON Performance]

FYI, for those who aren't going to be upping their brake size, the Rota Slipstreams or Attacks in 15" would fair quite well too.

You'll be able to run 205/50/15 rubber. This combo would yield very good results.

 

[dolphin]

For autocrossing on the MP3, I have run 225/50-15 "R" tires on 7X15 Fittipaldi rims. I had them left over from the MX-6 autocross days. I actually ran FSP this way for a few events until the tires went away. Now we are back to street tire class. Here are some links to earlier discussions:

http://woot.systemcrash.org/vbb225/showthread.php?s=&threadid=2850&highlight=225/5015

http://woot.systemcrash.org/vbb225/showthread.php?s=&threadid=5784&highlight=225/5015

I hope this helps you.