18's on a 370z

Gregor12 · 02-04-2017, 02:34 PM

Quote:

Originally Posted by TN.Z

26.7" diameter is stock so whichever is closest to that.

True. But he needs to match his front diameter and the stock diameter. Each corner must be within a certain range to not trigger traction control

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TN.Z · 02-04-2017, 02:36 PM

Yeah I missed that front size in his post. I think I read somewhere they need to be within 1" to not set off the TCS. So your recommendations above would be the best bet

Gregor12 · 02-04-2017, 02:38 PM

Quote:

Originally Posted by TN.Z

Yeah I missed that front size in his post. I think I read somewhere they need to be within 1" to not set off the TCS. So your recommendations above would be the best bet

I think I read that as well but cannot confirm the truth haha. It seems reasonable though...

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carlitos_370z · 02-04-2017, 03:41 PM

Here is the pic guys! Thanks a lot for the help

https://flic.kr/p/QxEQAq

I think im going with thw 295/35 cause I know is hard to find more than that here on PR

Jonny · 02-04-2017, 05:18 PM

I'm not to disagree with anyone, but the front oem tire size is taller than the rear. Nissan did this so the car can understeer, which is a lot safer than oversteering. The 350z had slightly shorter tires in the front than the rear and they constantly spin out.

The traction control system in our cars is not very sophisticated, so going with different tire size should not be a problem. In the summer I'm going to run 275/35R18 in the front with 295/35R18 in the rear.

carlitos_370z · 02-04-2017, 05:27 PM

Quote:

Originally Posted by Jonny

I'm not to disagree with anyone, but the front oem tire size is taller than the rear. Nissan did this so the car can understeer, which is a lot safer than oversteering. The 350z had slightly shorter tires in the front than the rear and they constantly spin out.

The traction control system in our cars is not very sophisticated, so going with different tire size should not be a problem. In the summer I'm going to run 275/35R18 in the front with 295/35R18 in the rear.

Thanks Jonny! I think im going to call this Monday to order the 295/35/18 tires

abm89 · 02-04-2017, 06:10 PM

Quote:

Originally Posted by Jonny

I'm not to disagree with anyone, but the front oem tire size is taller than the rear. Nissan did this so the car can understeer, which is a lot safer than oversteering. The 350z had slightly shorter tires in the front than the rear and they constantly spin out.

The traction control system in our cars is not very sophisticated, so going with different tire size should not be a problem. In the summer I'm going to run 275/35R18 in the front with 295/35R18 in the rear.

Not sure if the understeer is from how tall the tire is, rather than its width. The narrower front tire will definitely contribute more to the understeer. You're right about the TCS. It's useless.

Jonny · 02-04-2017, 07:11 PM

^ Apparently it does affect it. There is a guy that comes into my work who is an enginner for continental tires and gave me a lesson. Honestly I don't think it will have an enormous effect bit it does affect it a little. Also the cost of the tire is also a factor.

TN.Z · 02-04-2017, 07:28 PM

Quote:

Originally Posted by Jonny

^ Apparently it does affect it. There is a guy that comes into my work who is an enginner for continental tires and gave me a lesson. Honestly I don't think it will have an enormous effect bit it does affect it a little. Also the cost of the tire is also a factor.

Does it have something to do with the power rotation speed having more grip? I jut can't see how else tire diameter would matter much...

Gregor12 · 02-05-2017, 12:55 AM

I have heard different stories about diameter making a difference. It depends on the type of car as well. Here's a good read I found on it.

***If the tires up front differ in diameter from the ones in the rear, other kinds of handling defects can occur. If your car is front or rear wheel drive only, and you have compensated the difference in ride height, the only difference will be a difference in grip. A larger diameter tire will have a slightly bigger contact patch than a smaller one, and hence it will provide just a little more grip.

If your car is full-time 4WD, tire diameters can influence the amount of steering your car has very dramatically. Suppose the front tires are larger than the ones in the rear. The front end of the car will tend to travel a greater distance than the rear. Around a corner, the paths covering the largest distance are located towards the outside, and the short ones are located on the inside. So, the front end will want to go around the outside, and the rear will want to go right on the inside, making the car point outwards. In other words, the car will understeer horribly. It will feel like a ‘sticky’ kind of understeer too, slowing down won’t help very much, and braking will only help for a very short time because the car will very quickly try to return to its understeering state. The opposite can also happen: bigger tires in the rear will make the car oversteer very badly. ***

As stretched as that 285 is in the picture I would recommend going with a 305/30. Technically, if the tire brand and model remain the same, a 305 size tire should give you about half an inch on each side of the wheel. A 305/30 is just a tad bit shorter in the diameter so that will remain the same as well.

Again, all this is assuming that the calculator posted above is accurate.

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Gregor12 · 02-05-2017, 01:16 AM

This is a 305/30/18 on a 18x11.5. I definitely think you should go this route.

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Hotrodz · 02-05-2017, 05:48 PM

You may want to consider, 295 30 up front and 315 30 in the rear!

Gregor12 · 02-05-2017, 11:25 PM

This guy knows how to party^ lol

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carlitos_370z · 02-06-2017, 04:53 AM

Quote:

Originally Posted by Hotrodz

You may want to consider, 295 30 up front and 315 30 in the rear!

Thanks for the recommendation bro but I already have the 285/35/18 installed. Today Im going to try to change the rear 285/35/18 in the shop that I bought the tires. I hope they can change my tires if not, I have to buy another set of new tires for the rear

Hotrodz · 02-06-2017, 11:33 AM

Quote:

Originally Posted by carlitos_370z

Thanks for the recommendation bro but I already have the 285/35/18 installed. Today Im going to try to change the rear 285/35/18 in the shop that I bought the tires. I hope they can change my tires if not, I have to buy another set of new tires for the rear

Sorry about that...good luck my friend!

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02-04-2017, 05:18 PM	#410 (permalink)
Jonny Base Member Join Date: Aug 2015 Location: Chi-raq Posts: 67 Drives: 12' 370Z Rep Power: 10	I'm not to disagree with anyone, but the front oem tire size is taller than the rear. Nissan did this so the car can understeer, which is a lot safer than oversteering. The 350z had slightly shorter tires in the front than the rear and they constantly spin out. The traction control system in our cars is not very sophisticated, so going with different tire size should not be a problem. In the summer I'm going to run 275/35R18 in the front with 295/35R18 in the rear. carlitos_370z likes this.

02-05-2017, 12:55 AM	#415 (permalink)
Gregor12 Enthusiast Member Join Date: Oct 2013 Location: CHARLOTTE, NC Posts: 433 Drives: 2012 370z 6mt sport Rep Power: 12	18's on a 370z I have heard different stories about diameter making a difference. It depends on the type of car as well. Here's a good read I found on it. *If the tires up front differ in diameter from the ones in the rear, other kinds of handling defects can occur. If your car is front or rear wheel drive only, and you have compensated the difference in ride height, the only difference will be a difference in grip. A larger diameter tire will have a slightly bigger contact patch than a smaller one, and hence it will provide just a little more grip. If your car is full-time 4WD, tire diameters can influence the amount of steering your car has very dramatically. Suppose the front tires are larger than the ones in the rear. The front end of the car will tend to travel a greater distance than the rear. Around a corner, the paths covering the largest distance are located towards the outside, and the short ones are located on the inside. So, the front end will want to go around the outside, and the rear will want to go right on the inside, making the car point outwards. In other words, the car will understeer horribly. It will feel like a ‘sticky’ kind of understeer too, slowing down won’t help very much, and braking will only help for a very short time because the car will very quickly try to return to its understeering state. The opposite can also happen: bigger tires in the rear will make the car oversteer very badly. * As stretched as that 285 is in the picture I would recommend going with a 305/30. Technically, if the tire brand and model remain the same, a 305 size tire should give you about half an inch on each side of the wheel. A 305/30 is just a tad bit shorter in the diameter so that will remain the same as well. Again, all this is assuming that the calculator posted above is accurate. Sent from my iPhone using Tapatalk Last edited by Gregor12; 02-05-2017 at 01:03 AM.

02-05-2017, 01:16 AM	#416 (permalink)
Gregor12 Enthusiast Member Join Date: Oct 2013 Location: CHARLOTTE, NC Posts: 433 Drives: 2012 370z 6mt sport Rep Power: 12	This is a 305/30/18 on a 18x11.5. I definitely think you should go this route. Sent from my iPhone using Tapatalk carlitos_370z likes this.

02-05-2017, 05:48 PM	#417 (permalink)
Hotrodz A True Z Fanatic Join Date: Aug 2012 Location: NW, AZ Posts: 9,330 Drives: 10 Nissan 370z Nismo Rep Power: 2684385	You may want to consider, 295 30 up front and 315 30 in the rear! carlitos_370z likes this. __________________ *Fast Intentions TT Installed and Tuned by Seb at SpecialtyZ 610whp 560tq:\|Fast Intentions 3" TT-TDX*\|SpecialtyZ/Fast Intentions 72 Row Oil Cooler\|SZ 6 Puck Clutch & Flywheel\|3GsCustoms\|Z1\|Wavetrac\|Hotchkis\|Whiteline \|Blitz\|Fortune Auto 500\|Fujimura\|SPL\|H&R\|TK\|TWM\|RPM Rollbar\|Sparco\|Next Level Performance\|TrackSpec\|AeroFlow Dynamics\|Pioneer\|

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02-04-2017, 02:36 PM	#407 (permalink)
TN.Z Base Member Join Date: Mar 2015 Location: Chattanooga TN Posts: 161 Drives: 09 BSM 6sp - 04 DBP Rep Power: 12	Yeah I missed that front size in his post. I think I read somewhere they need to be within 1" to not set off the TCS. So your recommendations above would be the best bet

02-04-2017, 03:41 PM	#409 (permalink)
carlitos_370z A True Z Fanatic Join Date: Jul 2013 Location: Puerto Rico Posts: 7,157 Drives: 13 Nissan 370Z SP M6 Rep Power: 7586	Here is the pic guys! Thanks a lot for the help https://flic.kr/p/QxEQAq I think im going with thw 295/35 cause I know is hard to find more than that here on PR

02-04-2017, 07:11 PM	#413 (permalink)
Jonny Base Member Join Date: Aug 2015 Location: Chi-raq Posts: 67 Drives: 12' 370Z Rep Power: 10	^ Apparently it does affect it. There is a guy that comes into my work who is an enginner for continental tires and gave me a lesson. Honestly I don't think it will have an enormous effect bit it does affect it a little. Also the cost of the tire is also a factor.

02-05-2017, 11:25 PM	#418 (permalink)
Gregor12 Enthusiast Member Join Date: Oct 2013 Location: CHARLOTTE, NC Posts: 433 Drives: 2012 370z 6mt sport Rep Power: 12	This guy knows how to party^ lol Sent from my iPhone using Tapatalk