stock fronts, new wider rears = unstable

svt to 370z · 05-03-2017, 11:56 PM

So I got new rears 305 30 19 on stock sport rays. I bought the continental extreme contact dw xl. I kept my stock fronts for now tread is still good. I was going to change those to 265 35 19 up front next year. However I noticed it seems unstable or "floaty" at high speeds changing lanes or even at speed of around 85 and above in straight lines. Is this because I should have wider tires on the front since I Put wider on the back? Any info would really help me with this.

Array · 05-04-2017, 12:58 AM

Perhaps the tires havnt been weighted correctly, do you have two different tires on the front and back? it very well could cause an off-balance feel

gomer_110 · 05-04-2017, 07:59 AM

1. Wider tires are more susceptible to tramlining. If you don't know what this is do a search as it's been discussed many times here on the forum.

2. Mixing tire compounds front and rear can really screw with the handling of a car especially this one. Again, it's been discussed at length in other other threads on here.

cjwsrt6 · 05-04-2017, 09:36 AM

Gomer got it, be sure to check your pressures, when mine get a few pounds low early winter I can feel it doing the same thing

Jayhovah · 05-04-2017, 09:55 AM

Quote:

Originally Posted by gomer_110

1. Wider tires are more susceptible to tramlining. If you don't know what this is do a search as it's been discussed many times here on the forum.

2. Mixing tire compounds front and rear can really screw with the handling of a car especially this one. Again, it's been discussed at length in other other threads on here.

Do wider tires on the rear affect tramlining too? I thought tramlining would only be affected by the width of the fronts.. but I am not too knowledgeable about this stuff.

Halfkiddio · 05-04-2017, 10:07 AM

Quote:

Originally Posted by Jayhovah

Do wider tires on the rear affect tramlining too? I thought tramlining would only be affected by the width of the fronts.. but I am not too knowledgeable about this stuff.

Yes they can. Wider tires will also make a bad alignment show issues worse. Make sure your toe is in spec, as that will cause issues with pulling over painted lines or camber changes.

Also, how many miles are on your Z? Bad hubs can also cause this, as I have been chasing a bad hub issue for about 6 months now.

svt to 370z · 05-05-2017, 11:32 AM

It only has 15k miles on it. thanks guys i will check front pressure. I might just buy the matching front tires in 265 as well instead of waiting until next year

370zBLAST · 05-09-2017, 09:32 PM

I experienced this with my new rims. It's really normal id say as far as tramlining goes. My rims spec are 19x9.5f and 19x10.5r with hankook ventus and i got my alignment and I notice this with certain roads. Just gotta have your hand on 9 and 3. Their is a article on tire rack that explains it.

Sent from my LG-LS997 using Tapatalk

Rusty · 05-09-2017, 09:41 PM

A lot of people who have changed tires either on the front only or the rear only with different tires have reported handling issues. Your's is not the first.

I get tramlining with my fronts. Hardly ever with my rear 345's.

05-03-2017, 11:56 PM	#1 (permalink)
svt to 370z Base Member Join Date: May 2011 Location: berea,oh Posts: 139 Drives: 09 red 370z 6mt Rep Power: 14	stock fronts, new wider rears = unstable So I got new rears 305 30 19 on stock sport rays. I bought the continental extreme contact dw xl. I kept my stock fronts for now tread is still good. I was going to change those to 265 35 19 up front next year. However I noticed it seems unstable or "floaty" at high speeds changing lanes or even at speed of around 85 and above in straight lines. Is this because I should have wider tires on the front since I Put wider on the back? Any info would really help me with this.

05-04-2017, 12:58 AM	#2 (permalink)
Array Enthusiast Member Join Date: Jun 2014 Location: home.jpg Posts: 286 Drives: '12 Pearly White Rep Power: 11	Perhaps the tires havnt been weighted correctly, do you have two different tires on the front and back? it very well could cause an off-balance feel __________________ 2012 370z 7AT- ES2 with PSS, K&N Drop-ins, LED's all around, Berk HFC, FI CBE non-res, KW V1's 2003 A4 5MT- The Beater

05-04-2017, 07:59 AM	#3 (permalink)
gomer_110 A True Z Fanatic Join Date: Aug 2011 Location: Perrysburg, OH Posts: 17,992 Drives: '11 Nismo #528 GM Rep Power: 36941	1. Wider tires are more susceptible to tramlining. If you don't know what this is do a search as it's been discussed many times here on the forum. 2. Mixing tire compounds front and rear can really screw with the handling of a car especially this one. Again, it's been discussed at length in other other threads on here. Chuck33079, Rusty, sx moneypit and 1 others like this. __________________ '11 370Z Nismo #528 Fast Intentions \| Stillen \| Motordyne \| Uprev \| CSF \| Zspeed \| Z1 Motorsports \| AST \| Swift \| SPC \| SPL \| Whiteline \| Hotchkis \| Bride \| Schroth \| Robispec \| Cusco \| Nismo \| Volk \| Forgestar \| Hoosier \| RJM '17 Titan Bone Stock

05-09-2017, 09:41 PM	#9 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 68 Posts: 35,180 Drives: 2011 Nismo GM 6M Rep Power: 2684437	A lot of people who have changed tires either on the front only or the rear only with different tires have reported handling issues. Your's is not the first. I get tramlining with my fronts. Hardly ever with my rear 345's. Hotrodz and Halfkiddio like this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

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05-04-2017, 09:36 AM	#4 (permalink)
cjwsrt6 Enthusiast Member Join Date: Apr 2014 Location: Alabama Posts: 452 Drives: 2005 crossfire Srt6 Rep Power: 11	Gomer got it, be sure to check your pressures, when mine get a few pounds low early winter I can feel it doing the same thing

05-05-2017, 11:32 AM	#7 (permalink)
svt to 370z Base Member Join Date: May 2011 Location: berea,oh Posts: 139 Drives: 09 red 370z 6mt Rep Power: 14	It only has 15k miles on it. thanks guys i will check front pressure. I might just buy the matching front tires in 265 as well instead of waiting until next year

05-09-2017, 09:32 PM	#8 (permalink)
370zBLAST Base Member Join Date: Feb 2014 Location: ct Posts: 247 Drives: 09 370z 6spd Rep Power: 11	I experienced this with my new rims. It's really normal id say as far as tramlining goes. My rims spec are 19x9.5f and 19x10.5r with hankook ventus and i got my alignment and I notice this with certain roads. Just gotta have your hand on 9 and 3. Their is a article on tire rack that explains it. Sent from my LG-LS997 using Tapatalk