Terence

Thank you, Jonathan and Elie. I have  a 2011 140bhp Supersport. I have found the speedometer calculation page from the suggestion by K7 above, and that profile height changes will have acceptable impact on my 13 in wheels.

I would like to be able to afford the Avon CR28 Sport but a quick look at prices indicate that I would have to pay twice as much as for ZZS tyres, which have also been recommended.

I am still not sure about the relative advantage of wider rear rims though. I understand that wider means more grip, but is that extra grip important just in fast road use?

Thank you, Toby, As I live in the rain shadow of Dartmoor, I was looking more for wet grip, but I will try the Toyos on my set of Apollos for (dry) track days. Luckily, with the two sets of wheels I can go for both, as I do not want to stop using the Seven even if it is wet!

Thank you again, K7!

As you suggested, I have now found an on-line calculator:

http://www.tyresizecalculator.com/tyre-wheel-calculators/tyre-size-for-rim-size-width-calculator

and this has answered that part of my questions.

Now I would be grateful for advice on whether wider is better!

I have a 2011 Supersport and know little about how tyre width affects handling for fast road, occasional track driving.

Thank you, I will certainly look at the Nankang NS2R for the front. I haven't found a tyre supplier that asks for rim width, so I will look again!

My Seven has 6in front and 7in rear wheels. They are currently shod with inherited 185/60 (F) and 215/50 ® tyres which will soon need replacing.

I have looked on-line, and spoken to my normal tyre fitter and am no wiser. Can anyone tell me what width/profile tyres are suitable for fitting to these two wheels, and what the optimum size would be best for road use (with perhaps a track day or two as well).

Does wider mean better? Will profile height affect the speedometer reading dramatically?

I would also be grateful for advice on which tyres I should consider, as I am now having to learn a great deal about owning and driving a Caterham that wasn't necessary previously with lesser vehicles!

Thank you.

Thank you, JV, I meant the stands similar to the ones you linked. These are illustrated here:

http://www.demon-tweeks.co.uk/motorsport/jacks-chassis-stands/champion-chassis-stands

as I say, I cannot find any reference to using these with a Seven!

Terence

I have been fortunate enough to inherit  a number of useful items with my recently purchased Seven, including two chassis stands.

I have been trying to find where to position these under the car, but have been unable to find anything about using them.

I will be grateful for any help or advice on positioning the stands, and/or whether the use of such stands is deprecated (on the grounds of safety, security or any other reason) or if using axle stands is inherently more stable.

TIA

Terence

Hi, Steve,

I may be interested in buying your wheels. Can you tell me what size tyres you fit (or have fitted previously) as I have been given some Yokohama tyres, but don't know yet the size.

Thank you,

Terence