Best size for autoX
#1
Best size for autoX
A year ago I purchased my '02 MSC with white 15" holies and Continental tires. I changed to 17" chrome rims with Dunlop 9000 run flats and I think they look great. I am considering trying a bit of autoX. I am wondering what size rims and tires are best for track/auto cross? Should I use 15s? I have two sets of 15s. The holies and a set of silver 15" five stars with new OEM stock Pirelli tires. I really know little to nothing about what would be best. I'd appreciate opinions!
#2
A year ago I purchased my '02 MSC with white 15" holies and Continental tires. I changed to 17" chrome rims with Dunlop 9000 run flats and I think they look great. I am considering trying a bit of autoX. I am wondering what size rims and tires are best for track/auto cross? Should I use 15s? I have two sets of 15s. The holies and a set of silver 15" five stars with new OEM stock Pirelli tires. I really know little to nothing about what would be best. I'd appreciate opinions!
Determine what class you should participate in.
Since you don't have a reduction pulley (Yet) then you are not in Street Modified which is highly competitive and allows for any wheel and any tire.
You have a cold air intake so that bumps you out of stock class which would be the best for you. You'd have to remove all upgrades (other than cosmetic) to participate in G stock (you can keep the cat back exhaust).
If you use street tires rated at least 140 treadwear then you can run in STX and if you want to run R compound tires then you are in D Street Prepared.
Given that your best set of rims will likely be the silver 5 star stock rims but I think they are 16" not 15".
16x6.5 stock rims allow for some good autocross tire sizes- see G-stock forum for particulars.
15x5.5 stock rims allow for 205/50-15 and usually Kumho V710 would be the best R compound (not allowed in STX class). This combo can be used for DSP class.
The 17" chrome wheels are heavy, not good for autocross.
#3
If you just going to test the waters I'd go with AZENIS RT-615 205/50R15 on your 15" rims. The better choice would 215/45R16 on your 16's. Both tires have reinforced side walls. I run the 215's on the street. The shorter tire give you better acceleration. You would run in SCCA STX class because you have the cold air intake and M7 STB.
#4
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I would say go for a while and learn how to drive before getting too worried about things. I think you already understand but the 18s would not be a good idea for autocross. Id just go with either of your 15s and pick the ones with the strongest sidewalls. At this point youll have a while to learn how to drive and you wont be set up for a very good class anyways, so just go for a stiff sidewall which should give you more consistent grip and just learn and have fun. If you are serious about autocrossing later going stock really is the mini strong point.
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