tyre size comparison for 20inch wheels

MYZ34 · 10-17-2010, 09:11 AM

hey all i asked the question here a while ago regarding tyre size...

i have the venaci VS124 in 20" with a 9.5" front and 12" rear

i have been advised off members on here that they run 255/30/20 front and 305/25/20 rear.

however when i went to my local tyre shop here in Australia (brisbane) they advised me i should be running 255/35/20 front and 305/30/20 rears

they also gave me this site to check out for myself.... i have attached pics to show you the difference in tyre sizes...

please give your opinion.... is the shop right???

MYZ34 · 10-17-2010, 10:00 PM

54 views and no one can help??

SoMBrA · 10-18-2010, 01:09 AM

Hello buddy

Here in Spain we have to use a "table" like the one you are showing up there if we want to go street legal, i mean, we could use the tyre we want, but we might have legal problems (tickets usually, and won't pass MOT)

Maybe that's why they are telling to do so... with such a low profile (20) you will have trouble on speed bumpers or any bad roads i would stay 30+ profile

MYZ34 · 10-18-2010, 09:45 AM

yeah same here mate, i dont know why everyone over in the states are running the lower profiles. as the data from the tyre calculations suggest that the overal diameter is too small and will also be causing false speedo readings. the 35f and 30r are very close to the standard tyre specs, and will fill the gaurds nicer

docaam · 10-20-2010, 02:04 PM

i had 30 in the front on my 20s very harsh ride and too much road noise go for 30 in the front and 35 in the rear

vehl · 10-21-2010, 12:44 AM

35 in the rear on 20s? that'll throw your speedo off.. if you want a compliant ride stay with 19s, but dont go more than 3% off the original tire diameter..

docaam · 10-21-2010, 06:12 AM

lol sotty 35 front and 30 rear...a very bad typo error

KaienZ34 · 11-08-2010, 04:06 PM

DOC..i'm looking to up size aswell from 255/30/20-F 305/25/20-R...to 255/35/20-F 305/30/20-R...How's the ride better than the smaller profile tires ? What tires did you go with ?

docaam · 11-09-2010, 11:07 AM

I had first 255/30/20 and 285/30/20 of yokohama advan sport, I always felt the front tires were giving harsh side plus the speedo error was there as well, so I upgraded to 255/35/20 and now it feels so much better, there is literally no harshness and road noise.

what exactly are you feeling with your current tire setup, and now if my speedo is on 100m/hr I am actualy driving on 99.5 m/hr

stormos · 11-09-2010, 12:09 PM

And what you say this setup? My plan

20" 9,5 x 20" 10,5 wheels

tire 245/35/20f and 275/30/20r

It will be ok?

stormos · 11-09-2010, 12:18 PM

Falkens spec:
245/35/20 on 8.0 - 9.5 Approved Rims
285/30/20 on 9.5 - 10.5 Approved Rims

docaam · 11-09-2010, 12:22 PM

Quote:

Originally Posted by stormos

And what you say this setup? My plan

20" 9,5 x 20" 10,5 wheels

tire 245/35/20f and 275/30/20r

It will be ok?

i think we have too much space in our fenders and for 9.5 255 suits better else you will have stretch look

10-20-2010, 02:04 PM	#5 (permalink)
docaam A True Z Fanatic Join Date: Nov 2009 Location: Dubai Posts: 2,532 Drives: Z34/240z/Hakosuka Rep Power: 28	i had 30 in the front on my 20s very harsh ride and too much road noise go for 30 in the front and 35 in the rear __________________ Old 370Z SOLD but not forgotten 370Z 40th, G37s, S30 RBZ, Hakosuka Skyline

10-21-2010, 06:12 AM	#7 (permalink)
docaam A True Z Fanatic Join Date: Nov 2009 Location: Dubai Posts: 2,532 Drives: Z34/240z/Hakosuka Rep Power: 28	lol sotty 35 front and 30 rear...a very bad typo error __________________ Old 370Z SOLD but not forgotten 370Z 40th, G37s, S30 RBZ, Hakosuka Skyline

11-08-2010, 04:06 PM	#8 (permalink)
KaienZ34 A True Z Fanatic Join Date: Oct 2009 Location: LA. not L.a. Posts: 21,652 Drives: Z34 Tour/Sport Rep Power: 177	DOC..i'm looking to up size aswell from 255/30/20-F 305/25/20-R...to 255/35/20-F 305/30/20-R...How's the ride better than the smaller profile tires ? What tires did you go with ? __________________ *"These Violent Delights Have Violent Ends"* http://www.the370z.com/members/kaienz34-albums-z34.html

11-09-2010, 11:07 AM	#9 (permalink)
docaam A True Z Fanatic Join Date: Nov 2009 Location: Dubai Posts: 2,532 Drives: Z34/240z/Hakosuka Rep Power: 28	I had first 255/30/20 and 285/30/20 of yokohama advan sport, I always felt the front tires were giving harsh side plus the speedo error was there as well, so I upgraded to 255/35/20 and now it feels so much better, there is literally no harshness and road noise. what exactly are you feeling with your current tire setup, and now if my speedo is on 100m/hr I am actualy driving on 99.5 m/hr __________________ Old 370Z SOLD but not forgotten 370Z 40th, G37s, S30 RBZ, Hakosuka Skyline

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10-17-2010, 10:00 PM	#2 (permalink)
MYZ34 Base Member Join Date: Sep 2009 Location: brisbane AUS Posts: 111 Drives: 2009 370z 6spd Rep Power: 15	54 views and no one can help??

10-18-2010, 01:09 AM	#3 (permalink)
SoMBrA Base Member Join Date: Aug 2010 Location: Spain Posts: 24 Drives: Toyota Celica VVTL-i Rep Power: 14	Hello buddy Here in Spain we have to use a "table" like the one you are showing up there if we want to go street legal, i mean, we could use the tyre we want, but we might have legal problems (tickets usually, and won't pass MOT) Maybe that's why they are telling to do so... with such a low profile (20) you will have trouble on speed bumpers or any bad roads i would stay 30+ profile

10-18-2010, 09:45 AM	#4 (permalink)
MYZ34 Base Member Join Date: Sep 2009 Location: brisbane AUS Posts: 111 Drives: 2009 370z 6spd Rep Power: 15	yeah same here mate, i dont know why everyone over in the states are running the lower profiles. as the data from the tyre calculations suggest that the overal diameter is too small and will also be causing false speedo readings. the 35f and 30r are very close to the standard tyre specs, and will fill the gaurds nicer

10-21-2010, 12:44 AM	#6 (permalink)
vehl Base Member Join Date: Dec 2008 Location: asia Posts: 140 Drives: 370z PW/ GTI Rep Power: 16	35 in the rear on 20s? that'll throw your speedo off.. if you want a compliant ride stay with 19s, but dont go more than 3% off the original tire diameter..

11-09-2010, 12:09 PM	#10 (permalink)
stormos Base Member Join Date: Sep 2009 Location: Czech republic Posts: 71 Drives: 2010-37OZ-Blue-6M Rep Power: 15	And what you say this setup? My plan 20" 9,5 x 20" 10,5 wheels tire 245/35/20f and 275/30/20r It will be ok?

11-09-2010, 12:18 PM	#11 (permalink)
stormos Base Member Join Date: Sep 2009 Location: Czech republic Posts: 71 Drives: 2010-37OZ-Blue-6M Rep Power: 15	Falkens spec: 245/35/20 on 8.0 - 9.5 Approved Rims 285/30/20 on 9.5 - 10.5 Approved Rims