too much forward rake?
Thread Starter
Burning Brakes
Joined: Nov 2004
Posts: 1,107
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From: RI
too much forward rake?
I'm already making a budget for next years mods which include a c5 brake upgrade and a set of 18/19 rims but itstough finding matching tires. I understand that there has to be forward rake for the car to handle properly but will these tires look funny on the car?
285/30/18 =25x11.2x18 (3.5" tread rim to curb)
295/35/19 =27x11.6x19 (4" tread rim to curb)
Then add a rear lowering kit to bring the forward pitch back to close to stock?
285/30/18 =25x11.2x18 (3.5" tread rim to curb)
295/35/19 =27x11.6x19 (4" tread rim to curb)
Then add a rear lowering kit to bring the forward pitch back to close to stock?
Team Owner
Joined: Nov 2000
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From: I was a young troubadour when I rode in on a song, and I'll be an old troubadour when I'm gone.
St. Jude Donor '08
Just keep the overall tire height close to what came from the factory, and you'll be alright. Doesn't matter if you have 16, 17, 18, or 19 inch wheels as long as the overall tire height is correct.
Race Director
Joined: Sep 2004
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From: St. Peters MO Sometimes you have to prove yourself by doing alot of killing or alot of dying...
Originally Posted by Chance
Just keep the overall tire height close to what came from the factory, and you'll be alright. Doesn't matter if you have 16, 17, 18, or 19 inch wheels as long as the overall tire height is correct.
Race Director
Joined: Oct 2005
Posts: 11,770
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From: Rolla Missouri
2021 C4 of the Year - Unmodified Finalist
St. Jude Donor '10 thru '25
Originally Posted by sonomacrew01
I'm already making a budget for next years mods which include a c5 brake upgrade and a set of 18/19 rims but itstough finding matching tires. I understand that there has to be forward rake for the car to handle properly but will these tires look funny on the car?
285/30/18 =25x11.2x18 (3.5" tread rim to curb)
295/35/19 =27x11.6x19 (4" tread rim to curb)
Then add a rear lowering kit to bring the forward pitch back to close to stock?
285/30/18 =25x11.2x18 (3.5" tread rim to curb)
295/35/19 =27x11.6x19 (4" tread rim to curb)
Then add a rear lowering kit to bring the forward pitch back to close to stock?
Here is a formula that might make it easier for some people. I got this out of magazine a few years ago.
Formula for Calculating Tire Diameter:
((2 x Tire Size x Aspect Ratio) / 2540) + Rim Diameter
Example: 285/30 R18 = 24.732 Inches
((2 x 285 x 30) / 2540) + 18 = 24.732 Inches
Example: 295/35 R19 = 27.129 Inches
((2 x 295 x 35) / 2540) + 19 = 27.129 Inches
For comparison, the stock rear tires on my 1996:
((2 x 285 x 40) / 2540) + 17 = 25.976 Inches
So, I would think the difference between the front and rear of the tires you are looking at are too far apart. I think you would want to keep the overall diameter of the front and rear tires as close as possible.
I believe the front rake you are referring too, is in the way the suspension is setup not in tire size.
Just my opinion.
Thread Starter
Burning Brakes
Joined: Nov 2004
Posts: 1,107
Likes: 0
From: RI
I've spent hours trying to find a good tire combo on a 18/19 wheel and no luck. I guess 18's all around is the best bet. I'm looking into 18x10 front and 18x11 rear with now
Kuhmo ECSTA MX 275/35/18 front = 25.6
Kuhmo ECSTA MX 295/35/18 rear = 26.1
Kuhmo ECSTA MX 275/35/18 front = 25.6
Kuhmo ECSTA MX 295/35/18 rear = 26.1
Pro
Joined: Jan 2005
Posts: 644
Likes: 0
From: Denver Colorado
I curently have 18x19 combo on my car, the front wheel is close to factory and the rear is about 1 in. taller, which is something like 2% more circumference. I have no problems with handling, course I haven't been on a track, but on the street it's handled everything. If you're going to go with a 11 rear wheel I would suggest a wider tire, I have a 305 on mine and it seems a little tight. Go onto TireRack.com and look around at the tires you like, they have under specs all the information you could want about each tire and other sizes of that tire, or go to the wheel and tire section of the forum and look for either luke@tirerack, or Admiral94, both knowledgable, and very helpful.
BTW, if you have a 18 on front with a tire the same diameter as a 19 rim, the front tire will look bigger.
BTW, if you have a 18 on front with a tire the same diameter as a 19 rim, the front tire will look bigger.
Last edited by BRICHC4; Dec 30, 2005 at 12:03 PM.
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