Tire Size Input
04-07-2015, 12:40 PM
#1
Drifting
Thread Starter
Tire Size Input
I'm getting ready to order set of Weld RT-S wheels 18" all around for my GS. Fronts will be 8" wide and rears 11" wide. Rear tires will be 345/35-18 which measure 27.5" tall. My question is regarding front tire size. I am debating between a 245/40-18 or a 245/45-18. The 245/40 measures 25.7" tall which is basically stock height while the 245/45 is one inch taller at 26.7". I'm wondering which one is a better fit? The taller tire is closer to the 345 rears I will be running but over an inch taller then stock front tires. I'm wondering if this will create any clearance issues as car is lowered. Also want to avoid active handling issues etc. Any input is appreciated, thanks folks.
Last edited by JetstreamGS; 04-08-2015 at 12:58 PM.
04-08-2015, 03:29 PM
#2
Former Vendor
Why so narrow in the front if you have a gran Sport which uses a 275 from the factory?
Out of those two choices the 245/40-18 is the better choice and will make the electronics happy.
As far as handling issues though the 345 rear with a 245 front will create massive understeer
Most C6Z and GS running the 345 rear width run a 295 front width
Out of those two choices the 245/40-18 is the better choice and will make the electronics happy.
As far as handling issues though the 345 rear with a 245 front will create massive understeer
Most C6Z and GS running the 345 rear width run a 295 front width
Last edited by Luke@tirerack; 04-08-2015 at 03:32 PM.
04-09-2015, 02:21 PM
#3
Drifting
Thread Starter
The problem is Weld doesn't make a 9" front which would be ideal. They only make an 8" and 10". I thought about running a 10"/295 combo but was concerned that would be too big so that's why I'm thinking 8"/245 but now have the height dilemma.
I'm wondering why do you say the 245/40 would keep the electronics happy? I'm thinking on the contrary. Wouldn't the taller tire (245/45) keep the electronics happy since it is closer in height to the rear tires?
I'm wondering why do you say the 245/40 would keep the electronics happy? I'm thinking on the contrary. Wouldn't the taller tire (245/45) keep the electronics happy since it is closer in height to the rear tires?
04-13-2015, 11:03 PM
#5
tire
I'm confused, wouldn't the 245/45 at 26.7 put him closer to the 1" difference? The reason I am interested is I will be using a M&H 325/45/17 at 28" and looks like the 245/45/18 at 26.7 would be the one for me.
04-13-2015, 11:23 PM
#6
Drifting
Thread Starter
I think I'm going to go with the 245/45.
04-14-2015, 05:56 PM
#7
Former Vendor
oops ... I misread the rear tire size and yes you are correct the 245/45-18 would be closer to the correct diameter as the 345/35-18 is 27.5" tall