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What do you mean "functionality"? Changing tire width certainly changes how much grip, tram lining, and steering kickback you'll get.

Also, are you talking standard or sport pack wheels?
 

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Discussion Starter #3
I have the standard wheels. Does installing wider tires reduce top speed? Is it a hindrance in any way to add wider tires?
What do you mean "functionality"? Changing tire width certainly changes how much grip, tram lining, and steering kickback you'll get.

Also, are you talking standard or sport pack wheels?
 

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Sorry but,

Reduce top speed? When was the last time you were at top speed in your Lotus?
Are you doing the Texas Mile soon?
 

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Discussion Starter #5
Doug there is a entire world outside of yours. I hit top speed everytime I go on the local "exotic" car ride. I actually posted a video on lotustalk. Do you not hit top speed often? I found your answer extremely helpful.
Sorry but,

Reduce top speed? When was the last time you were at top speed in your Lotus?
Are you doing the Texas Mile soon?
 

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Doug there is a entire world outside of yours. I hit top speed everytime I go on the local "exotic" car ride. I actually posted a video on lotustalk. Do you not hit top speed often? I found your answer extremely helpful.
For legal reasons, yours not mine, what track(s) are you hitting top speeds at? What speed are you hitting?
What size tires are you switching from to?
 

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Doug there is a entire world outside of yours. I hit top speed everytime I go on the local "exotic" car ride. I actually posted a video on lotustalk. Do you not hit top speed often? I found your answer extremely helpful.
judging by the amount of time it takes an elise to hit "top speed" I would venture that those are some very unsafe local "exotic" car rides..or you're on bonneville...


there are several wider tire options that work all with pluses and minuses...a common option is the direzza star specs, but all come with tradeoffs, most of which include a bit more sidewall...

it's not so much altering functionality, just the inherent tradeoffs with swapping wheels/tires out. I run 245s in the rear and 205s on the front on my monolites..which is about tapped out for the lotus..

**sorry 245s fat fingered the numbers
 

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Discussion Starter #11
No track, just good old fashioned country roads. The nature of my question is to figure out what the widest tires I can put on stock rims; unfortunately I haven't recieved a answer yet so I'm still not sure what size I will move to.................hopefully you can help me with that.
For legal reasons, yours not mine, what track(s) are you hitting top speeds at? What speed are you hitting?
What size tires are you switching from to?
 

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Sorry I looked up your other post.

Whats the top speed you guys have reached in your Lotus?

I was on a 4 mile straight country road with friends on each end of the road. I topped my car out and I could swear it was doing faster than 150, unless the odometer is off.

I have video of the fly by.
I guess I cant argue with an odometer reading 150, on a public road.
 

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Discussion Starter #14
That is a very astout observation. Everytime I ride with this particular group of guys my nerves are on a razors edge.
judging by the amount of time it takes an elise to hit "top speed" I would venture that those are some very unsafe local "exotic" car rides..or you're on bonneville...


there are several wider tire options that work all with pluses and minuses...a common option is the direzza star specs, but all come with tradeoffs, most of which include a bit more sidewall...

it's not so much altering functionality, just the inherent tradeoffs with swapping wheels/tires out. I run 245s in the rear and 205s on the front on my monolites..which is about tapped out for the lotus..

**sorry 245s fat fingered the numbers
 

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The stock rear tires on an Elise, base model, were 225/45 R17 assuming you go up to 245/45 R75:

Diameter inches (mm) 24.97 (634.3) 25.68 (652.3) 0.71 (18) 2.8%
Width inches (mm) 8.86 (225) 9.65 (245) 0.79 (20) 8.9%
Circum. inches (mm) 78.45 (1992.71) 80.68 (2049.26) 2.23 (56.55) 2.8%
Sidewall Height inches (mm) 3.99 (101.25) 4.34 (110.25) 0.35 (9) 8.8%
Revolutions per mile (km) 807.61 (501.53) 785.33 (487.69) -22.28 (-13.84) -2.8%

Tire Size Calculator - Compare Tire Sizes

so assuming you were red line limited then you will be able to go 2.8% faster.
 

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Discussion Starter #16
:clap:hot damn.....I may break 150. Thanks. QUOTE=doug_porsche;1717835]The stock rear tires on an Elise, base model, were 225/45 R17 assuming you go up to 245/45 R75:

Diameter inches (mm) 24.97 (634.3) 25.68 (652.3) 0.71 (18) 2.8%
Width inches (mm) 8.86 (225) 9.65 (245) 0.79 (20) 8.9%
Circum. inches (mm) 78.45 (1992.71) 80.68 (2049.26) 2.23 (56.55) 2.8%
Sidewall Height inches (mm) 3.99 (101.25) 4.34 (110.25) 0.35 (9) 8.8%
Revolutions per mile (km) 807.61 (501.53) 785.33 (487.69) -22.28 (-13.84) -2.8%

Tire Size Calculator - Compare Tire Sizes

so assuming you were red line limited then you will be able to go 2.8% faster.[/QUOTE]
 

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If you're going to go wider, I don't think it would be good to keep the tire thickness the same, you're better off with a 205/45 front and 245/40 rear, IMO. Too wide on too narrow a wheel and too much sidewall flex will hurt the way the car handles.
 

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You may find the information you're looking for here:

http://www.lotustalk.com/forums/f259/wheels-complete-story-103030/

Also, your Elise goes 150? Mine falls on its face at like 120. The cat-delete + ECU tune helped dramatically and I haven't been in a position to go fast since I did that upgrade, but still, 150 is moving right along. My speedo is also 8mph off (80mph really is 72mph) so maybe my speedo will give me 150 when I'm going 135 :)
 

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What is the widest tire I can put on the stock rear and front rims without altering functionality?
Depends on what you are after. For a show car you could probably go to 245 on the rear.
If it is for driving, then I would not go above 225.
The 6.5" fronts are too narrow for 205.


And with respect to your subsequent post...
Yes it will reduce top speed, and they will not handle as well. But I get the impression that is a secondary concern.
 
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