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Does 225/45R18 and 245/40R18 work better than 245/40R18 all around?

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Old 05-12-2009, 02:00 PM
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FL Does 225/45R18 and 245/40R18 work better than 245/40R18 all around?

I bought a second handed RX-8, the last owner had 245/40R18 Nitto tires installed.
These tires needs to be replaced, but i'll still struggling.
Should i get 225/45R18 all around? 245/40R18 all around?
Or 225 in the front and 245 in the back?
Mods on the car in this week will be HKS racing suction and legamax exhaust
Thanks
Old 05-12-2009, 02:01 PM
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DO NOT run a staggered setup on the stock wheels.

If you want to grip the road a little better, get the 245's

If you want a little better fuel economy, get the 225's
Old 05-12-2009, 02:02 PM
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I have 245/40R18 all around and I can tell you that there is a good difference.

Go with a good tire; I went with Falken FK452 and so far so good.
Old 05-12-2009, 02:03 PM
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I always ran 245 / 40 on my stock wheels. Great size for this car, hardly throws off the speedometer, and give lots of grip.
Old 05-12-2009, 02:06 PM
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what about steering response? torque?
Old 05-12-2009, 02:07 PM
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steering response is very good with 245s. I actually preferred the feel to the 225s. Might have somethign to do with getting rid of those shitty bridgestone tires that came with my car.

torque and rx-8 don't usually go in the same sentence.
Old 05-12-2009, 02:07 PM
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torque?
Old 05-12-2009, 02:11 PM
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Originally Posted by Jedi54
steering response is very good with 245s. I actually preferred the feel to the 225s. Might have somethign to do with getting rid of those shitty bridgestone tires that came with my car.

torque and rx-8 don't usually go in the same sentence.
lol, no they don't haha
Old 05-12-2009, 07:20 PM
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tire width isn't likely to have much direct affect on torque anyway.

Don't go staggered unless you dislike rotating tires. Don't go staggered with directional tires unless you like REALLY replacing tires prematurely.
Old 05-12-2009, 07:49 PM
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i wanted to go staggered cuz 245 looks weird on the front but it looks perfect on the back, plus wider track provide more grip
Old 05-12-2009, 07:50 PM
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stick with same tires all around.
Old 05-12-2009, 07:54 PM
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The RX8 was designed around balance, so keep all 4 tires the same.
Old 05-12-2009, 08:47 PM
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245 is too small in the back. 275 all around is where it's at
Old 05-12-2009, 09:38 PM
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Originally Posted by invasion08
The RX8 was designed around balance, so keep all 4 tires the same.
Thought about that as well, staggered tires do sound a little stupid on RX-8s
Old 05-12-2009, 10:27 PM
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Is it even possible to put 275's all the way around without rolling the fenders?
Old 05-12-2009, 10:28 PM
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Originally Posted by shazy
Is it even possible to put 275's all the way around without rolling the fenders?
I think not
Old 05-12-2009, 11:38 PM
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Originally Posted by dezau
I think not
i think so.. but the correct offset is important..

skip the stagger..

beers
Old 05-13-2009, 12:23 AM
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with the correct camber you could even fit 285's without fender rolling (no drop of course)
Old 05-13-2009, 12:32 AM
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^but will need to keep replacing tires at 10k or less if the camber is too aggressive
Old 05-13-2009, 01:10 AM
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I was just pointing out that it can be done w/out rolling the fenders
Old 05-13-2009, 11:25 AM
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i think teamrx8 runs 295s. i believe he has a drop as well.
Old 05-13-2009, 11:46 AM
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I think so. You do need an aggressive offset (+45) and 275x35 profile tires however on 18x9.5 rims.

[responding to "will 275's all around work w/o rolling fenders at stock suspension height"]

Go with 245x40 all around on stock 18x8 rims.

Originally Posted by dezau
I think not

Last edited by Huey52; 05-13-2009 at 11:50 AM.
Old 05-13-2009, 08:18 PM
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Another advantage of the 245s is that the extra rubber prevents you from getting curb rash on your stock wheels.
Fuel economy does suffer though, I went from about 350km on 50 litres with the 225s down to 330km so it's about a 6% increase in gas consumption.,
Old 05-13-2009, 08:33 PM
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An "agressive offset" is not +45 lol; more like +15.

+45 is very modest
Old 05-14-2009, 06:36 AM
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Of course depends on which 'aggressive' direction; +45 "tucked in" or +15 "stickin' out."

Our stock rims are +50 btw.

Originally Posted by Ross_Dawg
An "agressive offset" is not +45 lol; more like +15.

+45 is very modest


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