Tyre size help

[audi321]

So I've got 275/40/20 on the Cayenne at the moment, but if I went to 23" wheels, does anyone know the calculation for tyre size?

Thanks in advance all.

[Matt UK]

23" wheels? a'you fo' real, bro?

[littleredrooster]

...or of course, you could Google 'Tyre size Calculator' and click on the top result.

[audi321]

littleredrooster said:

...or of course, you could Google 'Tyre size Calculator' and click on the top result.

If you can find one which can cope with those tyre sizes then please post a link.....

[Fleckers]

40 series tyre is about 110 mm deep if on a 275 width tyre

23 inch rims will not give you the same rolling diamater no matter what tyre you us so I suggest going for 295/60 23 just because I can suggest that

[audi321]

I'm thinking 315/25/23?

[996TT02]

245/30*23

You have to reduce the tyre width to keep the same rolling radius, because there ain't no profile lower than 30.

Otherwise you can "only" go up to 22", everything stays the same as original except you now need 30 profile.

[H.7]

Depends on the profile you want and availability of tyres at that profile.

355/20x23 is spot on, but so is 245/30x23 and 175/40x23

[littleredrooster]

OK, within the first ten results. Not exactly difficult...

http://www.carbibles.com/tyre_size_calculators.htm...

[H.7]

Depends on the profile you want and availability of tyres at that profile.

355/20x23 is spot on, but so is 245/30x23 and 175/40x23

[troc]

996TT02 said:

245/30*23

You have to reduce the tyre width to keep the same rolling radius, because there ain't no profile lower than 30.

Otherwise you can "only" go up to 22", everything stays the same as original except you now need 30 profile.

Yeah, I calculated 285/30 R 22 as being about the biggest really.

[audi321]

H.7 said:

Depends on the profile you want and availability of tyres at that profile.

355/20x23 is spot on, but so is 245/30x23 and 175/40x23

Cheers H.7 that's just spot on.

Littleredrooster - I bet you're fun to have a conversation with when 'Google it' seems to be your favourite phrase

[kambites]

315/25 R23 seems to be a pretty common size (relatively speaking) and is only off by about 7mm overall radius. Not sure how much clearance the Cayenne has though, to know whether that would rub.

265/25 R23 is also available in some tyres, and is a similar amount under-size.

Edited by kambites on Monday 10th February 22:22

[littleredrooster]

audi321 said:

Cheers H.7 that's just spot on.

Littleredrooster - I bet you're fun to have a conversation with when 'Google it' seems to be your favourite phrase

I'm a grumpy old tt with limited patience for inane questions which can be sorted with simple means. Get over it.