JDMricist_03

Hey guys! I'm in the market for some new tires and have my eyes on some Mickey Thompson E/T Streets for my C5Z. Stock size is:

Front: 265/40/17
Rear: 295/35/18

and the closest tire size in the E/T Streets are:

Front: 275/40/17
Rear: 305/40/18

I know going from 265 to 275 and 295 to 305 is fine but what about the rear sidewall size from 35-40? Will there be any ill effects from doing this besides throwing my speedometer off? Are there any tires that I should get instead?

UPDATE!! PLEASE LOOK AT POST #9!!

grantv

I think the Nitto NT05 is a somewhat similar tread, and pretty sure available in close to stock sizing. Going to 40 aspect ratio would increase the diameter about an inch. This may mess with the AH and will definitely affect handling, change your effective gear ratio, look odd...
You could probably guess I wouldn't do it.

helga203

You will be out of the proper wheel ratio to avoid ah/tc being activated. You will be 2" difference. Max is 1.5", but some get away with it. I have 1.75 diff and i have not had any problems. You will be about a 5 mile an hour diff on speedo. Give or take 1 or 2.

feeder82

really why? the sensor measures axle rotation if the tire is taller or shorter it changes distance traveled, and speed registered

493lszosix

Why not run the 305 35 18 et streets that's what I run with the 275 40's in the front

feeder82

i just had to take a shot at one of the C5 gurus

JDMricist_03

NT05s are what I run now and I HATE them. They are super unpredictable because sometimes they are super grippy and hug the road like glue and other times the front pushes and understeers HARD when I'm not even going that fast. I feel that they should be a lot stickier than they are because I spin the rears all day in 1st gear. Maybe it's because I'm not warming them up first? What is a good, sticky tire where I don't have to worry about warming them up yet still perform great for autoxing? I want a tire where I could just be cruising around and then turn into a mountain road and haul *** without having to think "Is it going to stick or not?"



Oh dang! I don't know how but missed them in the catalog! How do you like them man? Are they predictable? Or do you have to warm them up before they stick? Please tell me all you can about your experience with them and compare them with any other tire you've had please!

Any advice would be greatly appreciated as I have to make the decision by tomorrow after work because I'm getting a punctured tire replaced under warranty, I just pay the difference on my new tire, and I think the NT05s were $250.

cv67

Hard to expect any sticky tire to do its best without getting heat in them
If youre doing1/4 mi Ill take a little more sidewall and being more narrow over wide with rubber band sidewalls anday

There are guys running 10s on a wimpy 235/60/15 M/T for instance

JDMricist_03

Oh wow, that's insane. So tall tires are really that much more grippy??

I autocross though so I think these will be perfect. Just ordered them. Super stoked.

sean.b

for drag. because the tires are wrinkling and bunching up on the road. you cant do that for auto-x/road courses.

popular street tire choices for road courses/HPDE/auto-x for the last ~6 years running:
Michelin Pilot Super Sport
Michelin Cup 2
Hankook RS3
Hankook RS4
Sumitomo HTR Z3
Toyo R888 (r compound)
Hoosier R's (basically a slick, though)

Go to any track day and you wont find more than 4 different tire types on 90% of the vehicles there. Auto-x is a little more loose, but for raw performance, the cream floats to the top fast at tracks.

JDMricist_03

This is exactly what I was looking for, thanks!

Gordy M

Your two best 200TW street tires for autocrossing are Rival S (BFG) and Re71R (B'stones). With Z06 wheels the BFG 275/315 set up is the autocrosser's choice. If you move to 19" rear tires the the Stones 275/18 305/19 is the smart setup. For Road courses many like the Toyo R888 because they are streetable, or the Michelin PSS. In autocrossing the Rival and RE71R tires are what all the best drivers are running in the stock tire class.

jwh172

I hope your NT05's are just a bad set because I am about to buy another pair. I have had two sets (i am using 295/40/18 in the rear) now and i like them a lot. They seem to be very predictable for me all of my HPDE events. However I haven't autocrossed them yet. I am conscious about heating them up before I do fun/stupid things with them. But all i do is wiggle the steering wheel for about a half of a mile.

I don't think any 200 tread wear tire is going to have more grip than the NT05's. Also, there isn't a non slick street tire than can handle full throttle and first gear. If you are autocrossing, second gear is probably the lowest that you should go.

sean.b

i was wondering, because ive HEARD good things about Nitto. never tried them, though. but people love the KDW, and thats apparently for drag racing, because it's lateral grip was crap.

and yea the re71 and Rivals are super popular, too.

bluemike28

Check out the Bridgestone RE-11 as well. I run them on mine and it is like driving on Fly Paper!

JDMricist_03

Are you guys able to get any of those RE71R or RE-11 on stock wheels or are you guys running aftermarket wheels?

Drewstein

Taller tires add more rubber than wider tires because they add to length more than going wider can add to width.