ive been searching the web for some rims... and came across these rims on
customwheelsmarket.com
product number:
CWM-TOP-1133-7861B-CAM(17" x 8.5")
CWM-TOP-1133-8961B-CAM(18" x 9.5")
CWM-TOP-1133-8161B-CAM(18" x 10.5")

I have a 94 Z28 and i would like to put the 17"(the first ones) in the front, and either of the 18"(the last two, one is 9.5" wide, other is 10.5" wide.... has anyone ever put 17" in the front with 18" in the back? well im looking to search for tires for these before i make the decision on buying them... and also finding out if i will be able to fit them on my car... please give me any input you have on this.... Thanks alot.
$Glen$

Im guessing i will need 245/???/17 for the first rims.... 255/???/18 for the second ones.... and 255 or 275/???/18 for the last ones.... not sure exactly on the height of the tire... so any help or anyone who has this size rims on there 94 or like body that can give me an example of what theyre workin with would help... thanks again

 

First you need to make sure the wheels will fit on the car. Since the part # appears to indicate its for a CAMaro you should be OK, but be certain the bolt pattern is 4x4.75" (120.65mm). Then check the offset of the wheels to make sure it is large enough for a 4th Gen chassis.

The 17x8.5" wheel should have an offset in the range of 35-50mm. The 18x9.5" wheel should have an offset in the range of 35-56mm, and the 18x10.5" wheel would need to be in the range of 45-55mm. Any less offset than that will put the wheels close to or outside the fenders, anything larger may cause the tires to rub on the inside fender liners. All of this is covered on page 2 of the "FAQ" stickied at the top of the forum topic listing page.

Lots of people are running 17's in the front and 18's in the rear. If you match the outside diameter of the tires (e.g. 245/45-17 front & 285/35-18 rear), you will notice that the sidewall height of the front tires is larger than the sidewall height of the rears. Some people don't like it like that. Going to a 1" larger diameter tire in the rear would make the sidewall height the same, but throws off the speedo (PCM reprogramming required), lifts the car a 1/2" off the ground and pushes the tires 1/2" up into the wheel wells (some people like that because it makes the gap between the tire and the fender look smaller). A 275/40-18 would provide a 1" larger diameter in the back. Larger diameter in the back will have the equivalent affect of going to a slightly lower (numerical) rear axle ratio.

 

Fixed.

 

ok... heres what ive come up with... ive decided to do the 17"x9.5"(had to go up due to offset issue of the 17x8.5's) front rims... with 245/40/17 Kumho Tires, and the 18"x9.5"(had to go down to barely meet the offset of 56mm) with 245/40***/18.

TOTAL COST= $1337.69- Id have to say thats a pretty bad *** deal for a new set off rims and tires that are smokin hot.. haha.

***(40) is that a good height for an 18 inch rim... if i go with that set-up???? thanks... appreciate the help injuneer
$Glen$

 

Terrible choices on the tire sizes. Why do you want to go to a nice 9.5" wide wheel, and then put narrow 245 section width tires on them? A 245mm tire is less than 10" wide at its widest point. A 9.5" wide wheel is actually closer to 10.5" wide when you include the width of the flanges that hold the tire on the wheel. The tire is going to look like its "stretched" on too wide a wheel, and there is going to be nothing in the way of protection against curb rash, since the tire is narrower than the wheel. Most tire manufacturers recommend a wheel width of 8.0-9.5" for a 245 section tire, but when you put them on a 9.5" wide wheel, they don't look very good. And, that front tire is at least 1" smaller in diameter than the stock tire, causing a larger gap in the space between the tire and the fender. Unless your car is seriously lowered, its going to look like a toy tire.

You should have chosen:

Front - 275/40-17

Rear - 275/35-18 or 285/35-18

 

You should see if you can change your order. Freds right, and I don't think you will be happy with the look.

 

i havent ordered it... but thats what i came to after the first round of help... that was my main question in the first place.. what size tires do i need? so thanks for updating me on that... ill definitely look at those tires... and update what i found.... thanks again injuneer.
$Glen$

Heres what ive come to... after the last bit of help...
17"x9.5" Front Rims (Kumho ASX 275/40/17)
18"x9.5" Rear Rims (Kumho ASX 275/35/18)

Look Good?

 

Looks like a much better choice.

 

Alright now I have a question. Why a Kumho ASX? Kind of a cheap crappy all season tire?

 

My friend has kumho's on his 99 v6 and hes had em on there since he got it... i drove the car and theyre nice tires... im gonna keep my stock rims and tires in case i ever wanna burn some rubber. lol. but i mean.. .theyre cheap and ive felt and seen em at work and i like. i might change later on.. but im tryin to keep this project under 1500
$Glen$

 

Ah I see. I've driven on them before too. But there are much worse and I definitly understand the budget thing! Good luck!

 

275's are a bit wide for the front don't you think? Wouldn't it affect turning radius and also rub on the inner fender well?, I'm not sure about this...

fred what about 255/45/17's or 265/" "/17 in the front on a 17x9.5 rim will it still look stretched and rediculous? I just picked up (4) 17x9.5 AR Torque Thrust II 505's and I really don't want to put 275's all around.

I'm looking for a happy medium; as in not too skinny and not to wide of tires. I still also want to be able to rotate tires as well.
So I'm kind of stumped on this one...

Suggestions here are needed buddies!

 

The stock tires on a 4th Gen SS or WS6 coupe are 275/40-17. The car is designed for that size tire, and there is no rubbing. Many people, including myself run 17x9.5" wheels with 275/40-17 tires in the front, and they do not rub, and as long as you have the correct offset on the wheels, there is no impact on steering, turning radius, etc. There are people running 315's in the front, on 17x11 wheels, for Auto-X applications.

If you want a narrower tire, you have to find the closest match to the rear tire diameter (25.65" for a 275/40-17, same as a stock 245/50-16).

245/45-17 = 25.68" (OK, but look stretched)
255/45-17 = 26.03" (Porbably the only possible choice)
265/45-17 = 26.39" (NO)
265/40-17 = 25.35" (NO)

 

I would go with OE Wheels 17" Z06 Rims

If you don't like those Plenty More to Choose From

I have the 18" versions and they are awesome for the price.

Would allow you to go with a much better tire and still beat the $1300 price tag mentioned above, as well as being sure they are the right rim for the car.

 

Injuneer, thanks again for enlightening me.

I need to do my homework a little more...lol