Correct Tire sizing when changing wheels...
12-10-2004, 02:25 PM
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Quote: Also, just keep in mind that a 285/40 is slightly taller than a 275/40...
I am having trouble even finding a 275/40/R18 for sale. I checked the Dunlop website for the SP9000 tires everyone is talking about, but couldn't find the specs there on their website. They had a 255/45/18 and that was all I could find. Does anyone have a website where I can find some 285/40/18's and some 255/40/18's? Also (stupid question), what does the middle number stand for? Thanks.
Nelson
I am having trouble even finding a 275/40/R18 for sale. I checked the Dunlop website for the SP9000 tires everyone is talking about, but couldn't find the specs there on their website. They had a 255/45/18 and that was all I could find. Does anyone have a website where I can find some 285/40/18's and some 255/40/18's? Also (stupid question), what does the middle number stand for? Thanks.
Nelson
12-10-2004, 07:53 PM
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Originally posted by dayz
Quote: Also, just keep in mind that a 285/40 is slightly taller than a 275/40...
I am having trouble even finding a 275/40/R18 for sale. I checked the Dunlop website for the SP9000 tires everyone is talking about, but couldn't find the specs there on their website. They had a 255/45/18 and that was all I could find. Does anyone have a website where I can find some 285/40/18's and some 255/40/18's? Also (stupid question), what does the middle number stand for? Thanks.
Nelson
Quote: Also, just keep in mind that a 285/40 is slightly taller than a 275/40...
I am having trouble even finding a 275/40/R18 for sale. I checked the Dunlop website for the SP9000 tires everyone is talking about, but couldn't find the specs there on their website. They had a 255/45/18 and that was all I could find. Does anyone have a website where I can find some 285/40/18's and some 255/40/18's? Also (stupid question), what does the middle number stand for? Thanks.
Nelson
so 255/40/18
255mm wide, 40% of that is on your side wall. 18" of course. 18" wheels.
Hope this helps you out.
245-40-18 and 275-40-18 is great for 8.5 front 9.5 rears
For those who run 9" front 10.5 rear
255-40-18- 285-40-18 is the way to go. You need to extra 10mm to help out the pull on your tires. This will give your tire a better life and some people prefer the Non stretched look.
255-35-19 and 285 35 19 are closest to factory height not 245 & 275 for 19"
12-10-2004, 08:08 PM
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Originally posted by guido51
For my 350Z , european setup , the stock tires are 225/45 R18 front and 245/45 R18 rear , with stock wheels 8 x 18 , + 30 mm offset.
I'd like to change wheels to leave stock tires (in italy we have homologation problems)
I found two solutions that like me ; both solutions are 8,5 x 18 ,
for front and rear , first with 25 mm offset , second with 30 mm offset : my question...
Doe's front wheels 8,5 x 18 fit right with stock tires 225/45 ?
Any controindication or suggestion ??
For my 350Z , european setup , the stock tires are 225/45 R18 front and 245/45 R18 rear , with stock wheels 8 x 18 , + 30 mm offset.
I'd like to change wheels to leave stock tires (in italy we have homologation problems)
I found two solutions that like me ; both solutions are 8,5 x 18 ,
for front and rear , first with 25 mm offset , second with 30 mm offset : my question...
Doe's front wheels 8,5 x 18 fit right with stock tires 225/45 ?
Any controindication or suggestion ??
Make it right
255-35-19 w/ 19 x 9 & 285-35-19 w/ 19 x 10.5
12-10-2004, 08:16 PM
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Originally posted by skirby015
Hey guys, new to the forum with a yellow 05 Z. I just bought 19x10 rear and 19x8 front rims for my car. They are custom made so they wont be ready for another month. I need to buy tires and I dont want to get the wrong ones. I dont know anything about this subject. Can anyone help me by recommending what tires to get and the sizes, etc. THanks
Hey guys, new to the forum with a yellow 05 Z. I just bought 19x10 rear and 19x8 front rims for my car. They are custom made so they wont be ready for another month. I need to buy tires and I dont want to get the wrong ones. I dont know anything about this subject. Can anyone help me by recommending what tires to get and the sizes, etc. THanks
Use 19 x 8.5 or even 19 x 9. Do not use 8", a bit too narrow.
You want to use 255-35-19 and 285-35-19 Those will be the best bet for you. For any reason you have to stick with the 8"
Use 245-35-19 instead. leave 285 at rears, those will be the best combo for you.
If you can, must change order to 19 * 9 front. 8.5 would be fine
Hope this helps you out. Let me know what you end up doing and send me a picture. I am using good old Nismo Combo 245/40/18 275/40/18
12-10-2004, 08:20 PM
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Originally posted by jreiter
The most common rim sizing is 8.5" wide with 245mm tires in the front and 9.5" wide with 275mm tires in the rear. (That's what the Nismo rims are, for example.) On 19" rims like your's, the ideal tire sizes would be 245/35/19 front and 275/35/19 rear. I believe those sizes will fit on your rims. If possible, you might want to kick the front rims up to 8.5" wide instead, as that will more readily accept a 245mm tire. I'd personally also kick the rear down to 9.5", since that will weigh less than a 10".
On that note, if you're interested in getting rid of the understeer the Z has, you might want to consider making the front and rear tires as equally wide as possible. I'll be getting 255's on the front next time to make them a bit closer to the 275's on the rear. I don't know if a 255 would fit on your 8" rim, though.
The most common rim sizing is 8.5" wide with 245mm tires in the front and 9.5" wide with 275mm tires in the rear. (That's what the Nismo rims are, for example.) On 19" rims like your's, the ideal tire sizes would be 245/35/19 front and 275/35/19 rear. I believe those sizes will fit on your rims. If possible, you might want to kick the front rims up to 8.5" wide instead, as that will more readily accept a 245mm tire. I'd personally also kick the rear down to 9.5", since that will weigh less than a 10".
On that note, if you're interested in getting rid of the understeer the Z has, you might want to consider making the front and rear tires as equally wide as possible. I'll be getting 255's on the front next time to make them a bit closer to the 275's on the rear. I don't know if a 255 would fit on your 8" rim, though.
255 usually needs 8.5". 8" will work, not totally recommended
12-10-2004, 08:27 PM
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Originally posted by skirby015
I have no choice with regards to the front tire. The 2pc. version of the rim I bought only comes 8" for the front. I would have like to go wider but I can't. Now im trying to figure out the right tire setup. Everyone says something different and I don't want to end up listening to some guy who is trying to sell me whatever tire he has in stock. I would like to go in there with some understanding. Which is why I come to u fellow Z owners for help
I have no choice with regards to the front tire. The 2pc. version of the rim I bought only comes 8" for the front. I would have like to go wider but I can't. Now im trying to figure out the right tire setup. Everyone says something different and I don't want to end up listening to some guy who is trying to sell me whatever tire he has in stock. I would like to go in there with some understanding. Which is why I come to u fellow Z owners for help
That would help you out
http://www.discounttiredirect.com/di...foTireMath.jsp
This will definitely help you. Keep in mind, your stock should be 225/45/18 front 245/45/18 rear
255/35/19 & 285/35/19 rear are the closest to OEM spec, with 8.5 inch rim front and 10" rear, you should be fine. perhaps 9" front. Depends on the wheel offset and how it all fit under your fender.
12-10-2004, 08:33 PM
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Originally posted by jreiter
I think the stock Touring rims are only 8" wide. Only the rear Track model rims are 8.5". (As far as I know.) I would guess a 265mm tire would be way too wide for an 8" or even 8.5" rim. Be sure to check the tire specs on the tire manufacturer's website. They'll have the acceptable range of rim widths listed in those specs.
I think the stock Touring rims are only 8" wide. Only the rear Track model rims are 8.5". (As far as I know.) I would guess a 265mm tire would be way too wide for an 8" or even 8.5" rim. Be sure to check the tire specs on the tire manufacturer's website. They'll have the acceptable range of rim widths listed in those specs.
265 all the way. You have to have 18 * 9 all the way or 18 * 9.5
12-11-2004, 09:51 AM
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Originally posted by jchen1020
Cancel your 19 x 8 immdieately, they are custom, right?
Use 19 x 8.5 or even 19 x 9. Do not use 8", a bit too narrow.
You want to use 255-35-19 and 285-35-19 Those will be the best bet for you. For any reason you have to stick with the 8"
Use 245-35-19 instead. leave 285 at rears, those will be the best combo for you.
If you can, must change order to 19 * 9 front. 8.5 would be fine
Hope this helps you out. Let me know what you end up doing and send me a picture. I am using good old Nismo Combo 245/40/18 275/40/18
Cancel your 19 x 8 immdieately, they are custom, right?
Use 19 x 8.5 or even 19 x 9. Do not use 8", a bit too narrow.
You want to use 255-35-19 and 285-35-19 Those will be the best bet for you. For any reason you have to stick with the 8"
Use 245-35-19 instead. leave 285 at rears, those will be the best combo for you.
If you can, must change order to 19 * 9 front. 8.5 would be fine
Hope this helps you out. Let me know what you end up doing and send me a picture. I am using good old Nismo Combo 245/40/18 275/40/18
12-11-2004, 11:07 AM
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Originally posted by skirby015
I can't cancel the 19x8's for the front. Even though they are custom, the guy won't make my front rim any wider. Whats the problem with having the narrower tire in the front? Is it going to mess with the performance of the car by a lot? The rims will be ready in a couple more weeks, As soon as I have the pics I will post them. Thanks for the tire info.
I can't cancel the 19x8's for the front. Even though they are custom, the guy won't make my front rim any wider. Whats the problem with having the narrower tire in the front? Is it going to mess with the performance of the car by a lot? The rims will be ready in a couple more weeks, As soon as I have the pics I will post them. Thanks for the tire info.
Don't het me wrong. There is nothing wrong with it. It it just not what I would prefer, I think a bit wider would make it look sexier.
Also, it will be able to take a 255 tire to match the 285 rear.
But if you want to do 245/35/19. That is all good
19 *10 needs 285/35/19.
12-11-2004, 01:50 PM
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Originally posted by jchen1020
I would not go 19 * 8. But that is an OK size. Just do 245/35/19
Don't het me wrong. There is nothing wrong with it. It it just not what I would prefer, I think a bit wider would make it look sexier.
Also, it will be able to take a 255 tire to match the 285 rear.
But if you want to do 245/35/19. That is all good
19 *10 needs 285/35/19.
I would not go 19 * 8. But that is an OK size. Just do 245/35/19
Don't het me wrong. There is nothing wrong with it. It it just not what I would prefer, I think a bit wider would make it look sexier.
Also, it will be able to take a 255 tire to match the 285 rear.
But if you want to do 245/35/19. That is all good
19 *10 needs 285/35/19.
12-11-2004, 04:41 PM
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Originally posted by skirby015
I wish I could go wider, but i can't. The rims have a 4" offset in the rear and 2 1/2 offset in the front. Will the 245/35/19F and 285/35/19R work well for me. Do you have any recommendations for tires because I heard with 19's, its a much rougher ride
I wish I could go wider, but i can't. The rims have a 4" offset in the rear and 2 1/2 offset in the front. Will the 245/35/19F and 285/35/19R work well for me. Do you have any recommendations for tires because I heard with 19's, its a much rougher ride
Again you need not worry 285/35/19 for the rears. That is plenty of side wall. 35% of 285mm is quite a bit. That is almost 100mm. a lot of side wall.
How ever 245 is the one you need to worry about for a bit. If you really CAN'T change the order. Go with 245/35/19 front, it will be alright for you. Use 285/ 35/19, you will be happy with the wide look. Assuming offset is right, you won't have rubbing problem, if you need a bit more clearence, you can always roll the fender a bit. cost about 50-100 dollars. ( only if it rubbs) Again, with the right offset, you should not rub.
Rears should be 30mm or more in offset, front should be 25mm
12-29-2004, 11:02 AM
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19s
Guys,
I have a base model and I'm going Volk TE 37s with front 19x8.5 +22 and rear 19x9.5 +22.
I'm thinking of 255/35/19 fronts and 285/35/19 rears. Is anyone running this set up? If so please post pics and let me know if it works.
I have a base model and I'm going Volk TE 37s with front 19x8.5 +22 and rear 19x9.5 +22.
I'm thinking of 255/35/19 fronts and 285/35/19 rears. Is anyone running this set up? If so please post pics and let me know if it works.
12-29-2004, 07:44 PM
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Re: 19s
Originally posted by prozac777
Guys,
I have a base model and I'm going Volk TE 37s with front 19x8.5 +22 and rear 19x9.5 +22.
I'm thinking of 255/35/19 fronts and 285/35/19 rears. Is anyone running this set up? If so please post pics and let me know if it works.
Guys,
I have a base model and I'm going Volk TE 37s with front 19x8.5 +22 and rear 19x9.5 +22.
I'm thinking of 255/35/19 fronts and 285/35/19 rears. Is anyone running this set up? If so please post pics and let me know if it works.
1) The more difference in width between the front and rear tires, the worse your understeer will be. A 30mm difference causes a lot of understeer, so a 40mm difference would be even worse. However, if you don't drive your car hard on the twisties, this probably won't matter. It's mainly a concern for the track/autocross guys, and the guys who go nuts on the twisties.
2) A 275/35/19 is closer to the stock tire diameter (245/45/18) than a 285/35/19 is.
If you main goal is just to have as much grip as possible in a straight line, then the 285 is probably what you're after. If you're after the best handling you can get, though, the 275 might be where you want to go.
12-30-2004, 10:10 AM
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Re: Re: 19s
Originally posted by jreiter
Yeah, that should be fine. However, you might want to consider a 275 on the rear instead for two reasons:
1) The more difference in width between the front and rear tires, the worse your understeer will be. A 30mm difference causes a lot of understeer, so a 40mm difference would be even worse. However, if you don't drive your car hard on the twisties, this probably won't matter. It's mainly a concern for the track/autocross guys, and the guys who go nuts on the twisties.
2) A 275/35/19 is closer to the stock tire diameter (245/45/18) than a 285/35/19 is.
If you main goal is just to have as much grip as possible in a straight line, then the 285 is probably what you're after. If you're after the best handling you can get, though, the 275 might be where you want to go.
Yeah, that should be fine. However, you might want to consider a 275 on the rear instead for two reasons:
1) The more difference in width between the front and rear tires, the worse your understeer will be. A 30mm difference causes a lot of understeer, so a 40mm difference would be even worse. However, if you don't drive your car hard on the twisties, this probably won't matter. It's mainly a concern for the track/autocross guys, and the guys who go nuts on the twisties.
2) A 275/35/19 is closer to the stock tire diameter (245/45/18) than a 285/35/19 is.
If you main goal is just to have as much grip as possible in a straight line, then the 285 is probably what you're after. If you're after the best handling you can get, though, the 275 might be where you want to go.
01-01-2005, 01:15 AM
#97
Originally posted by jreiter
It's the tire size that affects things, not the rim size. (Of course, rim size limits your tire selection, so I guess it does come into play a bit.)
A 255/40/18 and 275/40/18 combo is the closest to stock diameters. (Almost perfect.) That's going to be my next size combo when I replace my tires.
It's the tire size that affects things, not the rim size. (Of course, rim size limits your tire selection, so I guess it does come into play a bit.)
A 255/40/18 and 275/40/18 combo is the closest to stock diameters. (Almost perfect.) That's going to be my next size combo when I replace my tires.
01-01-2005, 02:24 AM
#98
Okay all you wheel/tire experts, after reading all 5 pages of this thread, i've learned a whole lot and changed my mind prolly 3x about my next setup. This is what i'm liking so far: the Volk GT-N wheel, 18x9x4. This wheel doesn't come in half sizes. I'm looking for a good combination of straight-line grip plus vaccuuming up those corners, if this combo is possible. What do you think of 9" width all around, and what tire-size combo would you recommend to help me both in the corners and on straightaways?
The only thing i'm still totally clueless on is what offset i should be looking for with this setup. Is offset adjustable? Is it something i request from the wheel vendor? Is lip width adjustable with this two-piece wheel? What should i be looking for re lip width?
ps: i entered the first '05 post on this thread! Here's wishing all your z/gs all the best in '05!
The only thing i'm still totally clueless on is what offset i should be looking for with this setup. Is offset adjustable? Is it something i request from the wheel vendor? Is lip width adjustable with this two-piece wheel? What should i be looking for re lip width?
ps: i entered the first '05 post on this thread! Here's wishing all your z/gs all the best in '05!
01-01-2005, 03:30 AM
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Re: Re: Re: 19s
Originally posted by jchen1020
Actually 285 might be closer, depends on which manufacture. Go see tirerack.com you should find them in the SPECS section. Every brand has a bit of vairation.
Actually 285 might be closer, depends on which manufacture. Go see tirerack.com you should find them in the SPECS section. Every brand has a bit of vairation.
01-01-2005, 04:26 AM
#100
Re: Re: Correct Tire sizing when changing wheels...
Originally posted by jreiter
I don't understand why everyone says this. It really makes no sense to me. Perhaps you can clue me into why. Here's my thinking:
In the front, 255/40/18 seems to make more sense than 245/40/18. Look at the numbers:
1) 255/40/18 is almost identical to the stock front 225/45/18 in diameter. As we all know, matching the stock diameters is always a good thing to shoot for. Keeps VDC happy and doesn't mess with your speedometer.
2) A front of 255/40/18 is only 20mm narrower than the typical rear of 275/40/18. The stock setup is 225/45 and 245/45, which is also 20 mm difference. Going with a 245-275 combo gives you a 30mm difference, which would just increase understeer even more.
Given these two important factors, I just don't understand why everyone uses a 245/40/18 front tire instead of a 255/40/18.
I don't understand why everyone says this. It really makes no sense to me. Perhaps you can clue me into why. Here's my thinking:
In the front, 255/40/18 seems to make more sense than 245/40/18. Look at the numbers:
1) 255/40/18 is almost identical to the stock front 225/45/18 in diameter. As we all know, matching the stock diameters is always a good thing to shoot for. Keeps VDC happy and doesn't mess with your speedometer.
2) A front of 255/40/18 is only 20mm narrower than the typical rear of 275/40/18. The stock setup is 225/45 and 245/45, which is also 20 mm difference. Going with a 245-275 combo gives you a 30mm difference, which would just increase understeer even more.
Given these two important factors, I just don't understand why everyone uses a 245/40/18 front tire instead of a 255/40/18.