Track forum general chit chat.

[slcook54]

Originally Posted by k_mann

Anyone have feedback on the conti contact forces? I was set on running the rt660's but they look back ordered until the end of spring for 275/35/18

Will be my next tire choice. Couple of folks here running them and seem happy overall

[k_mann]

Originally Posted by slcook54

Will be my next tire choice. Couple of folks here running them and seem happy overall

Im starting to lean towards it. Just saw the new kumho v730 is in 275 but priced super well. Might be another one to consider

[///Mobbin]

Originally Posted by slcook54

Will be my next tire choice. Couple of folks here running them and seem happy overall

@berns and I setting PR's on RT660's (granted many other factors at play) but I dig them, only 2 track days in for me so far though.

[///Mobbin]

Sorry realize now you meant the Contis!

[k_mann]

Originally Posted by ///Mobbin

@berns and I setting PR's on RT660's (granted many other factors at play) but I dig them, only 2 track days in for me so far though.

Ugh yeah I've had a lot of friends running them and enjoying them. But you guys bought them all so I guess I'm going to have try one of these new 200tw's lol

[wparton]

I have the conti sports now and have only done a couple HPDE days on them but they were nice. Before that I had Indy 500s and they were about the same. Didn’t see the forces in the size I wanted so I have a new set of rs4s otw, boring but they work.

[Bartledoo]

Originally Posted by k_mann

Anyone have feedback on the conti contact forces? I was set on running the rt660's but they look back ordered until the end of spring for 275/35/18

I like them on my 986. Also, I just put a set on my M3. I’ll get to test on Saturday on a track I’ve done thousands of laps at with the M3 on scrubs of Pirelli DH, Yoko A005 medium, and michelin S9m+; and A052, AR1, NT01, and RS4.

[sc_tr0jan_m3]

Just ordered a set of contis for my lapping days. I also have a backup set of rs4's to compare against. Should be an interesting comparisons.

Now the set of A7's tho… 🤔

[Bimmer Barney]

While on the topic of tires… where do you guys like to start cold pressures, and where do you target hot on square 275 RE71's? Headed to the track Saturday. Ambient temp should be high 70's and I haven't run these tires on track before.

TIA

[M eyedoc]

So is the NT01 no longer the tire of choice?

[derbo]

Originally Posted by Bimmer Barney

While on the topic of tires… where do you guys like to start cold pressures, and where do you target hot on square 275 RE71's? Headed to the track Saturday. Ambient temp should be high 70's and I haven't run these tires on track before.

TIA

Hankook Motorsports recommended 32psi cold starting the day, with 38psi hot for their RS4 tire due to the weight of a stock car.

[PrimeBMW]

Originally Posted by Bartledoo

I like them on my 986. Also, I just put a set on my M3. I’ll get to test on Saturday on a track I’ve done thousands of laps at with the M3 on scrubs of Pirelli DH, Yoko A005 medium, and michelin S9m+; and A052, AR1, NT01, and RS4.

I'll be interested in your review of the conti contact force this weekend. I'm having a bit of trouble fitting the 295/30/18 A052 on my street car but maybe the conti force is slightly narrower????

[Bartledoo]

Originally Posted by PrimeBMW

I'll be interested in your review of the conti contact force this weekend. I'm having a bit of trouble fitting the 295/30/18 A052 on my street car but maybe the conti force is slightly narrower????

The Force has a much wider shoulder. I ran the A052 easily with no spacer. The Force hits the front KW CS shock body so I’m running a 5mm. The force is shorter in diameter though (295/30 vs 295/30) so it could help with spring perch clearance if you’re close there.

Pics of same size on same wheel for comparison…

[omgzirra_exe]

Originally Posted by k_mann

Im starting to lean towards it. Just saw the new kumho v730 is in 275 but priced super well. Might be another one to consider

i want to get V730, but man are they narrow.

[omgzirra_exe]

Originally Posted by Bimmer Barney

While on the topic of tires… where do you guys like to start cold pressures, and where do you target hot on square 275 RE71's? Headed to the track Saturday. Ambient temp should be high 70's and I haven't run these tires on track before.

TIA

i also brought this up in the discord yesterday.

with max vehicle weight our target temp should be likee 36-40psi right? but each tire has its own max limit..

i usually do 28psi on my cold 595RSRR (back up tires) and i started to understeer in 2 laps lol.

so i'm going to try 32psi.

generally both my front and rear are the same also.

[k_mann]

Originally Posted by PrimeBMW

I'll be interested in your review of the conti contact force this weekend. I'm having a bit of trouble fitting the 295/30/18 A052 on my street car but maybe the conti force is slightly narrower????

Make that two you have an audience now

[k_mann]

Originally Posted by omgzirra_exe

i want to get V730, but man are they narrow.

Oh darn, I didn't even look at the specs. Saw they're backordered as well though ugh lol

[omgzirra_exe]

Originally Posted by k_mann

Oh darn, I didn't even look at the specs. Saw they're backordered as well though ugh lol

yeah side by side to A052 same 275 sizing, the V730 looks like a 255 LOL

[rhyary]

Ha, I just bought 4 x V720 on sale.
The 305/30/19 indeed is narrow, but that works great for my 265/35/19 front.

The diameter of the 305 is better for the 265 than the 295/30/19. but I don't want wide 305.

I had the V720 275/35/19 on the rear and they were great as rear 200tw tire. I really liked them.

I did not want to pay full price for the V720 or V730

I am not sure how good they are as front tire, for that I have the RE-71R

[Chris_PDX]

Originally Posted by Bimmer Barney

While on the topic of tires… where do you guys like to start cold pressures, and where do you target hot on square 275 RE71's? Headed to the track Saturday. Ambient temp should be high 70's and I haven't run these tires on track before.

TIA

On my E46 M3 which is a lighter (by about 500 lbs), starting pressures depended on the day, but usually 26-28psi cold and 33-34psi hot.

[omgzirra_exe]

Originally Posted by rhyary

Ha, I just bought 4 x V720 on sale.
The 305/30/19 indeed is narrow, but that works great for my 265/35/19 front.

The diameter of the 305 is better for the 265 than the 295/30/19. but I don't want wide 305.

I had the V720 275/35/19 on the rear and they were great as rear 200tw tire. I really liked them.

I did not want to pay full price for the V720 or V730

I am not sure how good they are as front tire, for that I have the RE-71R

honestly if i had 19in wheels, V7x0 WOULD BE my go to tire. especially the 730.

[rhyary]

Originally Posted by omgzirra_exe

honestly if i had 19in wheels, V7x0 WOULD BE my go to tire. especially the 730.

There is no front 19" for the V720
v730 has 245/35/19 which would work with 275/35/19.