Downgrading 19" to 18" wheels?
Registered User
Joined: Oct 2007
Posts: 2,860
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From: Tennessee
Hang on, I'm about to blow your mind. How about using a tire with a taller sidewall so that the 18" wheel/tire combination is the same height as the 19" wheel/tire?
Using fancy maths, you can take the stock 19" wheel/tire heights, which are 245/40WR19 (front) and 275/35WR19 (rear) and calculate the total height, OR you can just use the same tire size that Nissan does with their 18" wheels, which are 225/50WR18 (front) and 245/45WR18 (rear). Notice that the second number on the 18's is bigger? That's the tire's aspect ratio.
Numbers...They usually mean something.
Using fancy maths, you can take the stock 19" wheel/tire heights, which are 245/40WR19 (front) and 275/35WR19 (rear) and calculate the total height, OR you can just use the same tire size that Nissan does with their 18" wheels, which are 225/50WR18 (front) and 245/45WR18 (rear). Notice that the second number on the 18's is bigger? That's the tire's aspect ratio.
Numbers...They usually mean something.
that cant be true
it's just that the Z is a car that is generally attained by 25+ year olds. It's a special treat from the car you got when you were 16 (78 ford pickup, '90 cavalier, etc). It's an upgrade from the fresh college graduate vehicles (honda fit, G6, corolla, etc)
z owners, imho, should already have experienced some background knowledge in regards to changing tires, upgrading new tires, oil changes, and dare say aftermarket upgrades (given it's a sports car). I think that's part of the reason why we give him such a hard time.
z owners, imho, should already have experienced some background knowledge in regards to changing tires, upgrading new tires, oil changes, and dare say aftermarket upgrades (given it's a sports car). I think that's part of the reason why we give him such a hard time.
I personally would NEVER go larger but might go smaller diameter. You may even be left with a situation where you want to keep your stock wheels and go with a lower aspect ratio tire, thus changing the overall diameter as well.
For example for the 370Z:
"225/50WR18 (front) and 245/45WR18 (rear) Yokohama® ADVAN Sport® high-performance tires "
You might want to go 40 series sidewall (40% of 245mm). So, 245mm * .40 = height of sidewall. Take that number times 2 then add the 18" for the wheel and you should get the overall diameter.
For example for the 370Z:
"225/50WR18 (front) and 245/45WR18 (rear) Yokohama® ADVAN Sport® high-performance tires "
You might want to go 40 series sidewall (40% of 245mm). So, 245mm * .40 = height of sidewall. Take that number times 2 then add the 18" for the wheel and you should get the overall diameter.
OH GOD that first pic of danny tanner made me LOL like LOL mang.!!!
it's just that the Z is a car that is generally attained by 25+ year olds. It's a special treat from the car you got when you were 16 (78 ford pickup, '90 cavalier, etc). It's an upgrade from the fresh college graduate vehicles (honda fit, G6, corolla, etc)
z owners, imho, should already have experienced some background knowledge in regards to changing tires, upgrading new tires, oil changes, and dare say aftermarket upgrades (given it's a sports car). I think that's part of the reason why we give him such a hard time.
z owners, imho, should already have experienced some background knowledge in regards to changing tires, upgrading new tires, oil changes, and dare say aftermarket upgrades (given it's a sports car). I think that's part of the reason why we give him such a hard time.
Registered User
Joined: Jun 2003
Posts: 461
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From: san francisco, california
Yep, that sounds about right. I would go for your second suggestion for the gearing and to beefin up the rear.
I would probably run 275/35's front and rear for track or drop to 17's. Street would probably be a 275/40-18 or 275/35-19 for daily driving. I'll figure it out in a year or so when i buy a 370z.
