R-Comp choices...

I'm prepping my Miata to run CSP (lets me run a bit more tire, no minimum weight on the seats, can swap the steering wheel out if I want to, and there's a LOT of street driven CSP NA miatas around here and only one STS miata), and am trying to decide which tires to get. suspension wise, I'm planning a FM2.5 kit with the mazdaspeed shock mounts at the front, with FM's 0.5" spacer so I only lose 0.5" of ride height on the street (roads around here kinda really really suck), poly or mazdaspeed bushings on everything, including engine mounts and diff mounts. I don't want to run any crazy alignments that would eat street tires, and I know that one of the R-comps out there works well in camber-challenged cars, I just can't remember which one and can't find where it was said on here which one it is. I have a feeling it's the Kuhmo V710s, but I'm not sure

Your miata will likely not be a camber challenged car. Because of the double a arm suspension the car will gain camber as it compresses. That being said, the v710's sound like a good choice of tire for what you are doing ( fun autox car that is fast, but not prepped to the limit of the rules)

thanks, and I slightly misunderstood what was meant by camber challenged cars. I thought it was just based on static camber, I completely forgot about the fact that the Miata is double wishbone and thus has a lot more camber gain than a strut suspension

Most of the CSP Miatas I've seen are running 275/35-15 A6's.

The 275 width 15's need a little cutting to clear.

The 255/40/13 would work well depending on gearing.

the course I've had the most experience with in the miata never had me getting out of 2nd, although it did feel like it wanted 2nd-and-a-half or 1st-and-a-half in some spots, so gearing shouldn't be an issue. considering this car might eventually see HPDE usage, would I be ok with 205-50/R15s? my frame of reference for grip is admittedly a set of Goodyear Hydragrip 185-60/R14s that were worn funny when I got the car, so anything is gonna be night-and-day

Platinum90 wrote: The 275 width 15's need a little cutting to clear. The 255/40/13 would work well depending on gearing.

I haven't had to cut to get my 275s to clear, but I run a little more ride height than your average CSP car.

A6's are a good bit faster than the V710's but don't last as long. I'm going to put Hoosiers on my car next season.

well, at this price per pop, I need something that's going to last a reasonable amount of time, since I can't afford to be plopping on a new set of R-comps more than maybe once a year, running a full-ish season and the occasional HPDE at either Summit Point or VIR

My vote is for the V710s. Like everyone else here said, they lack the absolute grip of the Hoosiers but last quite a bit longer (I've seen them last a season to a season and a half, depending on car setup, etc.) and are somewhat cheaper. If you are in the top portion of your autocross group, then get the Hoosier A6s and maybe a separate set of wheels/tires for non auto-x events.

I have a set of used Kumho V710 205/50/15 that I dismounted from my N/A RX-7 so I could sell the car. PM me if you are interested (this goes for anyone else here as well).

PM sent

rim reccomendations, or is that just plain up in the air? I've grown rather fond of the 949 6UL 15x7s with the nickel coating, especially for the price. lighter and cheaper than a Kosei K1 TS in the same size, much cheaper than rims from BBS and OZ that weigh in roughly the same, and a tick over a pound lighter than the TRMotorsports C1M 15x7sand a tick less than a pound lighter than the C1 15x7s (can't work out the C1-C1M weight difference though, they look like the same rim except for the center on the C1 has more relief to it around the lug bolts)

The lightest of the reasonably priced 15x7's is the Enkei RPF1 which is 9.9lbs I think at roughly $200ea. But run whatever you like, as long as they aren't 20lbs boat anchors you'll be fine.

The 6UL's are nice but check to make sure they're in stock. He seems to have constant supply issues with a lot of his stuff.

the preorder for the next run of wheels is going on now, pending getting the tires I'll plop down a preorder for them and the valves

don't limit yourself to a 7" wheel. Go with the 15x8 and you'll still be able to run 205 but can move to 225 if you want more grip.

I run the Kumhos on my E Stock MR2. For what it sounds like you want, they are a good way to go. If you want to build an all out car, no doubt the 275 Hoosiers on 15 x 10 wheels are the only answer. That's what I'll run on my FSP car. I had never driven an autocross in my life and for learning how to drive, the V710s are more than up to the job and they sure have lasted a long time. I can get a season and a half from a new set of 710s.

I should mention, someone much faster than me tried the Hankooks and says they're awesome. Worth looking into. I may try a set for the MR2 next time around. I haven't investigated sizes, but my understanding is they're less expensive.

don't forget the "other" R-comps.... especially if you want a yr or two of getting to know the car and going to track days... RA-1's R888's and the like... very good grip, less money, and tend to last longer ... + will work in the rain... at least a bit better than the A-6's/V710's