My tyres are 245/40/R18.

My spare is 205/55/R16.

It's my understanding that other Superb II are running on 205/55/R16, yet there is a big (3%) difference between the overall diameters & circumferences.

I've worked out that 205/60/R16 would be a very close match to the diameter of my 18s.

Is this setup somehow on VCDS or Maxidot?

My Car is on 225/45/R17 94W, on calisto alloys, however I use 205/55/R16 for winter tyres, and as far as I am aware, these sizes give the same result in relation to KPH / MPH.

I think there is a setting in Maxidot for winter tyres. That might sort you out.

I think there is a setting in Maxidot for winter tyres. That might sort you out.

No, this setting only gives you an option of setting up a "bong" at specific speed, so that you know that you've just exceeded allowable 120mph and the tyre will blow :sun: (it is allowed to use lower speed ratio tires for winter)

My tyres are 245/40/R18.

Sorry for stupid question but are you 100% sure that width of your tire is 245???? I don't think it's "legal" size for insurance purpose...

I think there is a setting in Maxidot for winter tyres. That might sort you out.

There is!!! iirc

Like the holiday setting (europe driving) etc

Yes allows you to adjust the reported speed by a certain % up and down if the rolling radius is different to standard iirc

As per above, unless you've changed them you have 225/40/18 tyres

Here u go!

Is the next screen after that the one where you set the speed reminder?

Is the next screen after that the one where you set the speed reminder?

Dunno.

Wot speed reminder?

U mean a preset speed and it bongs?

Dunno.

Wot speed reminder?

U mean a preset speed and it bongs?

Yeah, the thing that lmb mentioned.

Yeah, the thing that lmb mentioned.

Let me check the manual ....

A bit more complicated according to manual :

Sorry pic lop-sided :-(

Sorry for stupid question but are you 100% sure that width of your tire is 245???? I don't think it's "legal" size for insurance purpose...

Why dont you think its legal size for insurance?

It is if they have been told.

As for the 205/55/16 spare wheel it is used as a Get you home wheel and when used with larger wheels the speed is limited.

Setting Warning when reached 30mph...

If you need a speed warning / bong / buzzer to tell you if you are going over a certain speed then surely you aren't really paying attention to your speed???

@ruffday

I reckon (maybe wrongly) that your car comes with some "certified" wheel sizes and only these are "legal". I base my opinion on my insures (Skoda) because they asked if my winter tires are standard size allowed by manufacturer. They also mentioned 2% difference bracket - so I'm guessing again one of these factors make your wheels legal.

Someone gave a link to such document a couple of months ago and I am guessing 245/40R18 cannot be found in such certificate because as it was mentioned before there is 3% difference between standard and fitted wheel size.

If you need a speed warning / bong / buzzer to tell you if you are going over a certain speed then surely you aren't really paying attention to your speed???

I sometimes travel through Germany. I have one reminder for 85mph because this is legal in my destination country and another reminder for winter tires, so that during winter I don't go full speed on them

However I find this very strange how the speedometer is calibrateted at 10mph increases untill 80mph and then going to 20mph. Therefore it's very hard to tell if you are going ~85mph or 90mph at a glance.

The winter setting does nothing for speed correction. That is handled by a setting in vcds.

My Scout 225/50r17 tyres are the same od and the spare was the same 205/55r16. I changed the spare to a 205/60r16 so I can travel a decent distance at normal speed on it.

The 205/55r16 winters are to allow sufficient clearance for snow chains.

http://www.etyres.co.uk/tyre-size-calculator

@ruffday

I reckon (maybe wrongly) that your car comes with some "certified" wheel sizes and only these are "legal". I base my opinion on my insures (Skoda) because they asked if my winter tires are standard size allowed by manufacturer. They also mentioned 2% difference bracket - so I'm guessing again one of these factors make your wheels legal.

Someone gave a link to such document a couple of months ago and I am guessing 245/40R18 cannot be found in such certificate because as it was mentioned before there is 3% difference between standard and fitted wheel size.

The cars come from the manufacturer with certain size wheel and tyre fitted but if you fit a different size it is not illegal but you need to tell your insurance company.

I must say that I have never checked with my insurance about winter tyres as I just fit them to my standard rims so as far as i am concerned they dont need to know.

It's official, I am a total numpty! I've checked the tyres again and they are indeed 225/40.

This means there's only a 5mm diameter difference between my 18s and the 205/55R16. Phew!