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New Tyres! - Page 2 - Ride/Handling/Suspension/Brakes/Wheels/Tyres - The Lotus Forums #ForTheOwners Jump to content


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88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

Evora NA

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excellent, just ordered a set myself...thanks chaps....

i managed 7.5k on my last set of rears with quite a few TD's.

i have my DPM to OFF i suspect this is where the difference is if you have yours on race or sport on track - just a shot in the dark? ..... i suspect same same will apply to rear pads and disks ?

 

 

 

 

 

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This conversation again... 15k miles, 7 sets of rears.

Since doing the GEO and swapping to nitrons last summer, one set since then - although illegal now and will be binned after Spa this week.

Lotus Register - https://www.lotusregister.com

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Reckon I've got less than 1k miles left on my rears - no TD's and so about 8k miles by the time I change them.

Always run in Sport mode.

'....it makes every other roadster look just a little bit cissy...'

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Be good if you chaps near to Derby / Nottingham / Burton on Trent could let me know where you've got rear tyres from and who fitted them please and if any good.

I reckon I'll need to get some in next 3 months or so or ~ 2,000 miles.

Thanks and have good Easter.

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I'll probably use Blackcircles and have a mobile fitter.

In the Notts area they use Greenwoods for fitting, and he has a good reputation.

'....it makes every other roadster look just a little bit cissy...'

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Central Lotus are in Nottingham...

http://centrallotus.com/

88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

Evora NA

For forum issues, please contact the Moderators. I will aim to respond to emails/PM's Mon-Fri 9-6 GMT. 

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The prices are dictated by Lotus on the whole but some, eg Lancaster Amersham (Official Service Centre) will price match. 

88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

Evora NA

For forum issues, please contact the Moderators. I will aim to respond to emails/PM's Mon-Fri 9-6 GMT. 

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I got nearly 7000 miles from mine with one track day involved. They would have done a few hundred miles more but the car was at Lotus Silverstone ad they gave me price to replace that I couldn't beat just to get them mail order so I got them to do it.

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On 30 March 2016 at 18:50, Kalli said:

Thats a damn good price!!! Bought a set

Thanks for the heads up Andy

That is a great price for the Pirelli's

Just looking at other tyres on Camskill and it looks as though you could get a set of Michelin Pilot Sport Cup 2's for under £700 if you could fit a 215/45/17 (rather than usual 205) on the fronts.

anyone tried these on an Exige?

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When changing tyre sizes, you need to need to maintain the same rolling-radius.  As the sidewall profile is expressed as a percentage of the tread-width, with an increase in width, you need to reduce the profile to maintain the rolling radius/circumference.

If memory serves correctly, you generally need to reduce the profile by one size (e.g., "45" to "40") for every increase of two sizes in width (e.g., 205 to 225).

The significance of rolling radius is important.  Your ABS/ESP systems measure the relative difference in wheel speeds both between and across axles.  Wheel rotation and speed is the primary input to the Bosch ECU (it can't measure friction - only rotational velocity of individual wheels - and "g" inputs from other sensors).  An increase in rolling radius on a single axle will change the calibrated/expected speed differential between the axles (a constant differential is expected where there are intentional differences in wheel/tyre sizes between axles - as implemented by Lotus).  If you move the calibrated differential outside of expected tolerance (principally to accommodate tyre wear), then you can run into unexpected problems with ABS and stability control systems.

In summary, your Bosch 8.1 ECU is factory calibrated to accommodate the manufacturer selected wheel & tyre sizes.  Simpler set-ups, such as earlier Elise variants without sophisticated stability control systems, have more flexibility in the selection of aftermarket components.

It is difficult to predict the effect of changes to a "calibrated" system, such as that employed by the Exige V6 S/350.

 

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As an illustration of the above, the Avon ZZR tyre for the Exige V6, used as the control tyre in the Lotus Cup series and by some regular track-goers, is 215/40/R17 in size. The slight increase in width over standard is accompanied with a reduction in profile.

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Hi

does anyone know what the tolerances are? going from 205 to 215 on the front gives an increase in circumference of 1.46%.

as a comparison the difference between a new tyre and bald one (assuming a loss of 5mm tread) gives 1.6 % difference, albeit getting smaller instead of bigger.

I'm assuming seeing as the Cups are Porsche's preference for GT3 and GT4 they going to be good.

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