CONMAX

My MT DR's, in 315x35x18, are difficult on the freeway during lane changes. They seem to overreact to steering input. I would expect the 20's do the same thing. Some of this may be due to front tire differences, but who want to run DR's in the front.

At the strip, the sidewall flexing is not as problematic. There is a slight pull to the right as the car launches, and then it stays straight until you back off at the lights. I expect that once engine torque is applied to the tires, they stay fairly straight until you back off at the end. Slowing more gradually helps.

The 20's should be more forgiving and not react as much to steering inputs. The problem with them, is the increased diameter over the 18's. That 10% is like going from a 4.11 rear to 3.73. Bound to adversely affect 1/4 mi ET's.

Arctic Blastoff

Cant be worse then the stock tires

davepl

I have them mounted and installed now, driven on them a couple of times. At city speeds you don't really feel them.

At 55-60 they were a little odd on the highway. I think they follow ruts more, or the car likes to climb up and down the side of ruts perhaps. It wasn't spooky. Had I taken it up to 80 and it got worse, then it'd be spooky, but I'll save that for the track.

I get the feeling I'm going to be running these at the track mostly, but that's unfortunate, because they hook like a bastard.

It was 37F out at the time and literally was the first time I was ever able to run through the top of 1st and then into 2nd and 3rd without lifting. It would always break free before. Have to imagine they're even better when it's warm out.

Tangentially, how "Cant be worse then the stock tires" qualifies as a helpful post I'd love to know. My MPSS are a dream as long as it's not cold out.

Arctic Blastoff

All 4 or just the rears??

Arctic Blastoff

I bet the highway issue wouldnt be bad at 60 degrees or above,could be wrong.

davepl

Drag radials? I only run them on the front.

JK, the rear.

v jet

Can you post some pics of them mounted on the car?

rattt g

mine sucked at 70 deg,

Thomasmoto

Well I ended up ordering the chrome reproductions in 19X12 and another set of Nittos 345-30-19's .
I am not going with the MT's because I will be driving my car daily and having first hand experience with the Nittos is more important to me than a few hundredths of a second.

SpunkyQ8

Guys I went with the tires anyways.. My initial feedback in normal driving they seem fine and bites to the ground pretty well..
But Above 80 miles the car acts very weird!! I literally almost crashed as it changes lanes and swirves left and right .. What is it that I did wrong?


Pressure was @ 30 psi fronts were 30 as well..

rattt g

told you guys stay away from this tire till m/t can figure it out

C52K3

Could it be AH acting up do to the mt being a 1/2 taller.

SpunkyQ8

Its the exact same size as stock tire 335/25/20

C52K3

Michelin 335/25-20 is advertised as being 26.6 inches tall the MT 335/25-20 is advertised as 27 inches tall

Thomasmoto

Yes you did and I appreciate it very much, thanks.

davepl

Since I believe a lot of the skittishness comes from the softer sidewall, don't air them down. These are not a wrinkle wall slick, people.

I've go 34-36psi in mine. Roll through some wet and then some dry and make sure you've got a solid contact patch. But I think at 28psi you'd be rolling on the sidewalls and it's like driving on four bike tires instead of 2!

The next person who tells you to air down a drag radial, ask them why you're taking air out of a radial. If it's for sidewall flex, that's either designed into the tire or not, for sidewalls this short. These aren't recapped old truck tires or big new MT wrinklers. They're a street tire... sorta.

rattt g

if you lower air to 15 psi as per m/t it will get much better but should not have to run it that low to make it driveable

m/t has my tires rite now checking things out

SpunkyQ8

** Update **


Called MT tech and explained the issue to them ( swirly ride beyond 80 miles).

They asked me to bring down the pressure to 29 psi. I saw no diffrence.

I personally wanted those tires to work so bad, that i had to go out and keep on trying to make them work.. And they did!!

Now 1st thing 1st. The car over reacts at high speeds I recommend tuning your steering either on tour or sport (Sport worked best for me)

Rear tire pressure down to 25 psi
Front pressure down to 29 psi

Car smooth as silk no issue's what's so ever.
This thing flies from a dig you could literally dump the clutch no worries!

P.S my car is tuned-headers-CAI making north 620 to the wheel.

davepl

And yet people aren't flocking to click Thanks on the 5 times on multiple threads I've pointed out the problems with these were probably inflation-related :-)

Glad to hear it DOES make a difference though and that you've sorted it out. It's not fun not trusting your tires...

I'm running 34, so will try the drop to 29 and see if it makes any difference. Mine wasn't squirrelly to begin with, so I don't have much of a problem to solve, fortunately.

They sure do hook though, huh?

Ryanr206

I had a gt500 that the tire shop put 30psi in the drag radials. A 305/35-20. Was scary. Went home dropped them
To 22psi and they worked awesome. And hooked up like no other. Don't be scared to drop pressure. Mid low
20s is the sweet spot