My 225/50/15 V710s are over an inch wider than my 225/40/16 street tires on the same width rim. V710s last a long time. I can't equate it into road race miles but I can get about 300 miles autocrossing them or so and the stick lasts throughout the life of the tire. Quite a few people are running them successfully for roadracing.

 

will the 710s hold up on the road if you have to drive the car to the track?

 

Your kidding me right? Id say my clubs average for 710 life last year was 70-90 laps (basically the full season)... so about 60 miles based on our average courses. with that said we had one guy that ran S05's and he did 1.5 sets in the season with a few out of town events, he figured he might get a season out of just local events. so that tells me that kumhos last a bit longer, but only a bit, definatly not 300miles.

Oh id also put in my 2cents that the hoosier S05 is marginally slower, but not enough to matter. basically a 245/45 hoosier should be faster than a 225/50 710. at least thats what im banking on for the up coming season. Also the rumour is the S06 compound will last at least as well as a 710, might make it the more popular tire next year.

 

Good read guys. I learned some info.

 

I meant 300 miles total on them, about 70 miles actual autocrossing. I drove on the V710s short distances to events. I do not recommend driving with V710s on the street. Especially if a sudden rain shower should happen. I have seen people drive 5 miles to events on 710s and be scared to drive the car home because they were so worn down they might have a blowout.

 

Yes but I would avoid driving any R compound tire on the road. If it rains you're completely screwed and if you're unlucky enough to pick up a puncture you're also completely screwed.

 

+1

Has anyone tried the Avon Tech Ra?

 

If anyone has access to the "mue" (not sure how to spell it) data of the tire's we could figure this out mathematically, when compared with the cars weight of course...

 

"Mu"

It's even easier than that though. Use a stopwatch.

 

I ordered the Avon Tech R from Tirerack because of the hellish deal on them now. $118 per tire for 225/50/16. I'll tear them up and get V710's later in the season.

 

Avons are TALL, but good...we've been running a set on an E36 DSP/trackday car with great success, as with the V710 it is wider than the numbers suggest but the Avons seem VERY TALL as well.

Last a good long time too, but I wouldn't drive them on the street, even to/from an autocross.

 

How do they compare to the V710s and R304s?

 

On Kumho 710's, I've done 4-days at Roebling Road, with four (4) 15-minute sessions on a 2.2-mile long track.

I believe I averaged about 88-mph (1min, 30-secs) per lap; 22-miles per session; 88-miles per day; 352-miles total for HPDE, plus a whole season (11-months) of AutoX for 55-miles for a grand total of 407-miles.

So far the tires seem to be holding up, and I don't plan on getting new tires for another 6-months.

After a 15-minute HPDE session in 80+F weather, the 710's do tend to lose their grip/get greasy.

:-) neil

 

I got the Tech R's mounted and man they have some stiff sidewalls.
Anyone have a good starting point for air pressures? I was thinking 36 front 33 rear with tokicos @ 4 front 2 rear

 

I don't know when the 245/45/16 will be built, but the new tire will be very fast. My wife Beth and I have done all the development testing driving for Hoosier, and I will be switching back to Hoosier this year. I ran the V710 the last 2 years.

 

If i was you id start at equal pressues front and rear. Im not sure what a 'standard' value for the RX7 is yet but id guess somewhere around 35. should be easy to look up tho.

the easiest way to start is to play with your shock settings till they are they way you like, or as close as you can, then start altering airpressure to fine tune.

 

Anyone have some used V710 225/50/15's for sale?

 

Going back to the original post, I will echo the comments that there is no comparison between 710's and RA1's for autocross - I got a set of 710's in just in time for Canadian Nationals (CAC) this year - the difference in grip (in favour of the 710's) was greater than when I went from street performance tires to RA1's - I'd say they were worth 1.5, even 2 sec. on a typical course. I found I really had to learn to drive hard all over again - it was uncanny how much more cornering grip they had compared to the RA1s, how much quicker they turned in, and how they continued to provide strong grip even at high slip angles.
I know they will not last as long as RA1s - with our club, the RA1s are popular with the solo 1 drivers, along with the V700's, because they seem to hold up the longer, harder lapping better. Some who tried 710s found they worked well, others corded them quickly - probably a combination of driving style and chassis dynamics.
Echoing FDneal's comments (same club), solo 2 drivers with our club have been finding the 710 marginally faster than the a3s05 - however, some drivers are choosing the hoosiers precisely because they can get them in wider, lower profile sizes like 245/45/16 or 17 that Kumho doesn't offer. Given how close they perform, going with the wider, lower profile Hoosier may be the best choice if it fits. I will probably do the same when my 710s give out.

 

What's the best setup for an FC T2? Right now the car has 205/55/16's.

 

Bump