shifter77

Has anyone tried both brands. If yes could you give some input. Getting ready to order new tires.
Thanks

Wicked Weasel

I personally like the way the car felt with the Kumhos over the R6s, but I think they are both very close and you cant go wrong with either choice.

StealthLT4

I thought the V710 was more akin to the A6 than the R6. It won't wear out too fast on a road course?

Armycop

I ran one set of 710's last season (18's all round), did four track days on this set. Still see the wear dots across the tread. I'd say they last pretty good.

RedLS1GTO

I will preface by saying that I am not an expert!

I have used both within the last year on my C4. They are very different tires for sure. The rounded shoulder of the V710 seems to be better for a car that is ALMOST correctly setup. The R6 is square shoulder and if the car is actually set up to the point where you can use that whole patch, then you have about 2" more rubber on the road than with the V710 which is obviously a big advantage.

The Hoosier seemed to have a very narrow heat range that it liked. If you were in that range, it was awesome (much better than the 710). If I started pushing (too) hard, it seemed to get slick in a hurry. No matter what I did, I never got the 710 to the point that it felt too hot.

Short version:

My fastest laps were faster on the Hoosiers, but I was able to be more consistent on the V710.

magnetic1

Depends if you are racing. And if so, how long those races are.

bobmoore2

I've got a few scrub V710s in 305 width and a few scrub R6s in 275 width. So I will be running V710s on the rear and R6s on the front. I'm using them for HPDEs (20 to 30 minute sessions), not autocross (short sessions). I'll probably wear them out before they get heat-cycled out.

Has anyone else ran this combination? If so, how did it feel?

What should I expect (what differences will I see) -
- before they get up to temperature?
- as they warm up?
- when they get hot?
- if they get "too" hot?

What different characteristics will I see as they wear down (as the tread gets thinner)?

What differences are there in performance as they get more and more heat cycles?

RedLS1GTO

I ran a combo of V710s on the front and R6 on the rear in the same size (315). Both sets were at about 50% tread. The Hoosiers had a few more heat cycles. It drove pretty well, considering how old the tires were on all 4 corners although it was odd how it reacted with different temps. It went from very distinct understeer to a pretty bad oversteer as they got hotter and the Hoosiers started to get slick. The different sizes will obviously change it up a bit. If you set them side by side, I'm guessing that the 275 Hoosiers actually have about the same contact patch as the 305 Kuhmos.

bobmoore2

OK. Then I would guess that I will feel the opposite with the brands on the opposite ends. Probably will start with a slight understeer that gets worse as the R6s start to get greasy. I can handle that.

I'd rather be running the same brand on all four wheels, but I'm having trouble finding V710 scrubs in 275 or 285 by 18 sizes.

Thanks for the quick reply, redls1gto.

shifter77

I started this thread cause iam been using hoosiers 275 frnt 325 rear.
iam experierance lots of understeer turn in (push) with the 275 front.Was wondering if more rubber will help .

RedLS1GTO

That is a big difference front to rear that would tend to cause understeer. Bigger fronts or smaller (315?) rears would balance you out a bit.

Wicked Weasel

I am running 295F 315R

bobmoore2

I had the same feeling when I was running R888s with 265 front and 305 rear. The car was really pushing bad.

However, I don't think you can get much more rubber on the front without serious clearance issues (maybe 285). If I were you, I would try a little less rubber on the rear.

Until you wear out the current set of tires, try using slightly different air pressure, front vs rear, to change the grip of the rears. I think a higher rear pressure will reduced the grip at the rear. Can an expert post in with specific PSI numbers please?

You could also compensate a little by changing your driving style. Try cranking the wheel harder as you are going into the corner, as this will tend to throw the car into an oversteer condition. Trying to cause slight oversteer may compensate for the excessive understeer from your tires combination.

sperkins

The 305/30/18 V710 is one heck of a good tire. I'll take that over any sized R6 any day for my car. The square shoulder makes the car very responsive and sets the car really quick. They wear like iron too. The smaller diameter is better for gearing than a 315 or larger imo.

mikahb

R6 is a good, consistent tire. V710 is faster and, to me, offers better feel. Get yourself a set of used T1 wheels (17x10F,17x11R) and run 315/17's all the way around. Great grip, great balance, good stuff.

Bill Dearborn

Last year I went from running 315/17 Kumhos on all 4 corners to 315/18 R6s on all 4 corners. I could never get the R6s to perform as well as the Kumhos. What I found was a lot of people ran the A6s but not many ran the R6 and their advice didn't help much when it came to the R6. Hoosier recommends hot pressures in the 40 lb range but some people were advising I should have hot pressures in the low 30s upper 20s. I tried all sorts of combinations of tire pressure, I changed my wheel alignment from -1.3 degrees of camber to -2.5 degrees nothing helped. I got tired of playing with them and just used my Firestone WOs street tires the last two times I had the car at the track.

Bill

drivinhard

Their 295/17 would be a potential choice (if no contingency in '10) if I had any 10.5 or 11" x 17 rims. It's essentially the same width as their 305/18, albeit slightly taller (~26" rear stock height).

It would be a solid 10 pt tire.

Their 275/17 measures wider than the Hooiser 275/17, could be a decent 6 pt tire PTA/enduro tire if you need some pts for real brakes

sperkins

I burned through a set of round shoulder 275 V710's pretty quickly earlier this year running the stock ZO6 camber. If they have the square version in that size, it'd be a great choice for PT.

shifter77

OK, so i take it as i should try the kumhos.

Kubs

I have never run a brand new tire. The closest I came was a set of 3 year old V710s with no heat cycles, and I ran my fastest times with them. The Kumhos seem to hold up to heat cycles better but the sweet spot of a Hoosier will be faster. I also felt the Hoosiers were a little more predictable in a slide.