Sidewall Height on Front tires

BGTV8 · 10-30-2014, 03:45 PM

So, my track tyres are 265/35R18 on 9.5" wide wheels all round (square setup), +22 in front and +12 on rear. I could go +12 on front and +0 on rear but would need to roll inner fender lips.

My DD wheels are 8.5 front an 9.5 rear and I now run 245/45R18 fronts and 275/40R18 rears to get the gearing with the 4.08:1 diff gears I now run as close to OEM as I can.

Before the diff gears were changed, I ran 245/40R18 front and 275/35R18 rear as DD tyres.

What you cannot do is use tyres with OD more than 4-5mm diameter difference as that will confused the stability control.

kenchan · 10-30-2014, 04:26 PM

Quote:

Originally Posted by kenchan

youll want to compare load rating... and why nitto's.

Quote:

Originally Posted by osbornsm

Nobody makes a decent tire with the two sizes listed below, besides PSS, and those are too much for a Track Tire.

- OEM Front spec: 245/45/18
- OEM Rear spec: 275/40/18

thats not even an answer..

kenchan · 10-30-2014, 04:27 PM

like 2 geezers talking...

man that samich was good, how was yours?

yep agree, psi should read 35 cold.

IDZRVIT · 10-30-2014, 04:34 PM

Quote:

Originally Posted by speedfreek

Why do you want to run a smaller sidewall on the front?

It will lower your front by about an inch.

245/40 = 25.7 inch tire height
245/45 = 26.7 inch tire height

Nope. It will only lower the ride height by 1/2".

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10-30-2014, 03:45 PM	#16 (permalink)
BGTV8 A True Z Fanatic Join Date: Dec 2009 Location: 03350 Australia Posts: 1,516 Drives: 09 Nissan 370Z M6 Rep Power: 39975	So, my track tyres are 265/35R18 on 9.5" wide wheels all round (square setup), +22 in front and +12 on rear. I could go +12 on front and +0 on rear but would need to roll inner fender lips. My DD wheels are 8.5 front an 9.5 rear and I now run 245/45R18 fronts and 275/40R18 rears to get the gearing with the 4.08:1 diff gears I now run as close to OEM as I can. Before the diff gears were changed, I ran 245/40R18 front and 275/35R18 rear as DD tyres. What you cannot do is use tyres with OD more than 4-5mm diameter difference as that will confused the stability control.

10-30-2014, 04:27 PM	#18 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141522	like 2 geezers talking... man that samich was good, how was yours? yep agree, psi should read 35 cold.