Definitive best size wheel and tire thread for Exige/Elise - Page 15 - LotusTalk - The Lotus Cars Community
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post #281 of 283 (permalink) Old 01-05-2018, 02:58 PM
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Originally Posted by jdawson View Post
If I recall correctly, both 949Racing and some of the tire testing gurus for GRM recorded decreased lap times from running 205s on 8” wheels and 225s on 9” wheels.
That's exactly correct. In GrassrootsMotorsport and 949Racing testing, running 205s on 8" instead of 7" and 225s on 9" instead of 8" were proven to be consistently faster.

See here: https://forum.miata.net/vb/showthread.php?t=568828

Andy Hollis also has data floating around somewhere, but I'd need to dive into the internets.

Keep in mind that this is optimizing the wheel for the tire. For autocross, the results were showing that, on 8" wheels, times were about equal running either a 205 or a 225, which meant that the wider tire was not an advantage. I'm not sure if that carries over to track , where you spend a bit more time in steady state than autocross. But you also have longer straights on track so drag is more important...

2011 Lotus Elise SC Final Edition 15 of 15 - Ardent Red
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post #282 of 283 (permalink) Old 01-05-2018, 03:01 PM
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Originally Posted by shinoo View Post
Remember to consider the weight of the tire as well. Weight savings on the wheels may be lost with the added rubber - unless you are running smaller diameter tires...which I think you may considering.
I say nothing. :X

When it gets to tires though, the grip and dynamics of the tire are way more important than the weight. Wheels we can split hairs on the weight because that's the only real factor outside of fitment that we can quantify. Wheel stiffness is actually quite important to performance, but unfortunately we have no data on that front these days.

2011 Lotus Elise SC Final Edition 15 of 15 - Ardent Red
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post #283 of 283 (permalink) Old 04-06-2019, 05:24 AM
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Originally Posted by turbophil View Post
Main thing with those specs is to be sure the steering arms don't hit through the whole rang of suspension motion.

On the Elise, you have to be a little careful about getting into the body work on a 15x8 front wheel.

I usually recommend a 15x7 on the front of the elise. Also the PF01 looks similar to the 949 and has more caliper room... although at 3mm, you don't need more there. The 15x7 doesn't have any issues with getting close to the steering arm, FWIW.

Elise parts makes a steering arm that uses heim joints, which will buy you a fair amount of real estate when using the 8" wheel...

Hope that helps,

Phil
So finally, '05 Elise, stock bodywork, looking for 9" rear width and 245 tyre. Will it work on track with no rubbing? What is the best offset? Nitron Street Series suspension for now, probably will switch to NTR46 soon. -2.5 camber. I choose now between 16x8 and 16x9 rim for 245/45/16 A052 tyre. Thanks!

Elise '05 Saffron Yellow, Nitron SS, SSR Type C, Moroso oil pan, Toe link kit, TRACKmounts 2, Hawk HPS pads.
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