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Old 04-27-2004, 12:10 PM   #1
del105
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Default Best ST tire size for STi

Forget the 245/45/17, they are what I want but they rub.

Here are my options in kumho mx
235/45YR17 9/32nds tread width 9.4" overall 25.5"
245/40YR17 9/32nds tread width 9.9" overall 24.8"

What tire is fastAr on the Sti?
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Old 04-27-2004, 12:51 PM   #2
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I would go with the 245/40/17s. Im sticking with 245/45/17s myself.
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Old 04-27-2004, 01:00 PM   #3
Watkinsm3
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Quote:
Originally posted by del105
Forget the 245/45/17, they are what I want but they rub.
Are you sure they'll rub? Meaning have you tried it? What wheel size and offset?


Besides that... if you are determined to get the mxs then get these... 245/40YR17 9/32nds tread width 9.9" overall 24.8"


-Matt
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Old 04-27-2004, 02:24 PM   #4
del105
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The 245/45/17 will technically fit but I will need to raise my car up 1/2 in. and re-corner balance, and I just don't have time before saturday. The 245/45/17 actually have less tread width than the 245/40/17 with the 235/45/17 being slightly less than both. The reason I'm even considering the 235/45/17 is for the gearing. It should add a couple of mph to the top of 2nd. What do you guys think?
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Old 04-27-2004, 02:32 PM   #5
afpdl
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Quote:
Originally posted by del105
It should add a couple of mph to the top of 2nd. What do you guys think?
I think you will be better off geared lower in 3rd. The advantage of the 245/45/17 is its an azeni size
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Old 04-27-2004, 02:55 PM   #6
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Quote:
Originally posted by del105
The 245/45/17 actually have less tread width than the 245/40/17
mounted? I would imagine that the lower aspect ratio would pull the edges in a bit on a 7.5" wide wheel, forget my statement if you have 8" wide wheels.
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Old 04-27-2004, 02:56 PM   #7
del105
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"I think you will be better off geared lower in 3rd. The advantage of the 245/45/17 is its an azeni size"

I probably didn't mention that this is a strictly auto-x car, and I barely ever hit third gear. I think 3-4 more mph in 2nd would keep me from shifting on the faster courses. You think I could get 3-4mph with a inch more tire?
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Old 04-27-2004, 03:09 PM   #8
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245/45-17s are a larger diameter than the 225/45-17s. Moving toi a 245/45-17 would increase grearing and slow you down off the line.

If you want same rolling diameter, then the 245/40s would be the tires you'd want.
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Old 04-27-2004, 03:10 PM   #9
Watkinsm3
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Since I've had my STi I've only done one event where I didn't hit 3rd gear (I was all over the rev limiter though). I tend to agree with the idea of having shorter gearing to make 3rd more useful. It might also limit the need for me to immediately drop down to second for the next turn/manuever.

I'm on 255/40-17 v700s (not a street tire!) whatever that means to you guys...


-Matt

EDIT : Only 1 of the 6 events I've done so far this year with the STi has not required me to go to 3rd...

Last edited by Watkinsm3; 04-27-2004 at 03:17 PM.
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Old 04-27-2004, 03:10 PM   #10
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Mine isnt a strictly autox car but it gets autoxed alot. With 245/45/17 victoracers I have to go to 3rd at least once(or ride the rev limiter in 2nd for a few secs.) in about 3 out of 4 autoxs and every so often I will have to use 3rd for most of the run. Maybe the courses are faster down here.
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Old 04-27-2004, 03:20 PM   #11
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Quote:
Originally posted by afpdl
Maybe the courses are faster down here.
I would agree with that, we run on Nationals style courses every month, and half the time it's designed by a multi-nationals course designer (Roger Johnson).



You read that KC? Come on down to H-Town!!
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Old 04-27-2004, 03:23 PM   #12
afpdl
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Quote:
Originally posted by TyrannoSullyRex
I would agree with that, we run on Nationals style courses every month, and half the time it's designed by a multi-nationals course designer (Roger Johnson).
I also had to spend a good amount of time in 3rd in austin(not a nationals style course ) and almost all of the bmw events.
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Old 04-27-2004, 03:37 PM   #13
del105
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I guess I could run most of the Atlanta courses in 3rd but then I'd have to shift like 4-5 times during a run. For me I think I would actually lose more time shifting than just popping off the rev limiter every once in a while.
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Old 04-27-2004, 03:43 PM   #14
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if your just popping off the rev limiter every now and then, no you dont need to shift. The courses im talking about i get up over 60mph by a decent bit (one case crossed the line up near 80 according to the speedo) if I didnt use 3rd on some of these coursed I would just be coasting half the run.
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