Tire Sizes

[RogerMcDoger]

My Superb is currently running 235/40R19 tyres. I've seen some discussion about some people moving up in width, to something like a 245/40R19 instead. Is that a doable thing? The price for the tyres seems a lot better(and the range is bigger too) for the 245's. What are peoples thoughts?

[Tuan]

Find out the width of the rim and put it in here:

403 Forbidden

This does not account for scraping the fenders etc. ie in stock or lowered form, but more so what is physically possible to go on the rim.

Speedo will also read different but you probably already know this.

[RogerMcDoger]

Find out the width of the rim and put it in here:

403 Forbidden

This does not account for scraping the fenders etc. ie in stock or lowered form, but more so what is physically possible to go on the rim.

Speedo will also read different but you probably already know this.

Ahh good info. Thanks for posting.

[Tuan]

Also, if you ask a tyre shop what you can/should/are allowed to get, you will possibly get different answers.

I was after 225 tyres and one Bob Jane said, "we have 235s and they will be fine and cheaper" whereas another said, "I would not suggest putting 235 and stick to 225 OEM tyres".

Bleh

[skodian]

Also, if you ask a tyre shop what you can/should/are allowed to get, you will possibly get different answers.

I was after 225 tyres and one Bob Jane said, "we have 235s and they will be fine and cheaper" whereas another said, "I would not suggest putting 235 and stick to 225 OEM tyres".

Bleh

I personally will go for the right size as the variation in the tyre circumference may impact the the speedo reading.

Depending on which state , according to RMS in NSW state (http://www.rms.nsw.gov.au/documents/...si-09-rev4.pdf)

The wheel and tyre must be contained within the body work or mudguards (including any flares) when the
wheels are in the straight ahead position.



If the wheels are listed on your car’s tyre placard or in the owners handbook then the tyres you fit must be those

listed on the placard or in the handbook for these wheels.

[ZR36]

Check out Online Wheel and Tyre Fitment Calculator. Offset, Tyre Stretch and Speedo Error | Will They Fit
It compares existing set up and the new set up with diagrams and "out readings" pretty cool sight

Note there is a common miss conception around the "profile" measurement the /40 in the 235/40R19 is not the height in mm its a percentage. And this is what affects your rolling diameter.

In saying all that your engine an transmission is designed with the specified size. Changing that would not only affect the speedo reading but your gearing ratios efficiencies all sorts of things. Small changes will have minimal impact though.

[ZR36]

Everyone wants a bit of extra width though, right

[RogerMcDoger]

Everyone wants a bit of extra width though, right

That's what I've been told

It was all so I could save a bit of cash on the tires Looking at the prices now though 235's are cheaper than 245's. I would have sworn it was opposite the other day. Oh well.

[dArK5HaD0w]

I wanted to go from 225/40/18 to 225/45/18 on my Octavia, but BobJane said no deal.
I wanted to increase the tyre wall thickness for a softer quieter ride.

[Tuan]

I wanted to go from 225/40/18 to 225/45/18 on my Octavia, but BobJane said no deal.
I wanted to increase the tyre wall thickness for a softer quieter ride.

According to the speedo error calculator 100km/h will actually be 104 km/h (despite the built in error cars come from factory with) ... Going from 225/40/18 to 235/40/18 it'll only go from 100 to 101 km/h. 403 Forbidden Don't know why it says 403 forbidden, but the link works Shop probably thinks it's too much difference hence won't sell to you.

Probably a much bigger change in rolling diameter when changing the aspect ratio.

[ope126]

So it appears that the VW Passat Alltrack Wolfsburg Edition runs a 19x8 (Albertville) with 245/40R19 94W tyres.

I think there would be no issue with a change from 235 up to 245 still on the 8" rim.

Maybe VCDS can code for the different tyre size to cancel out any speedo error?

[jackpos]

I just changed from 225/45x17 to 225/50x17 (Michelin Pilot Sport 4) to achieve more comfort through better cushioning. My Elegance 125Tdi wagon feels much better in ride and general insulation from the road. The vehicle also looks a lot better in my opinion. The wheels rotate 17 times fewer per kilometre than before according to a specialised online calculator(tyresizecalculator.com/charts/tire-size-chart-metric-by-rim-wheel-diameter). Not sure what that means in economy or performance; A member of the Briskoda website says that that change makes the speedo about spot on, instead of 5kph fast.

[Kachingg]

I upgraded my tires from 225/45/18 to 235/35/19

In Victoria we are allowed a 15mm rolling diameter change as legal i just squeaked it in at 12.8mm

I used a app on my phone to gps check my speed i am now doing 98kph at a indicated 100kph it was 94kph at a indicated 100kph with the original 18 inch tyres

[ope126]

So a little further digging revels the Passat (like my previous B8 had) comes with a full size spare, so no real issues there.

I would be interested to hear from other ŠKODA Superb owners with 19" wheels what their space saver tyre is?
Mine is a Continental T125/70R18 99M CST 17.

I too am / was considering the change to a 245/40R19 tyre as replacement, however one piece of advice I received from a Tyre Retailer was to check the spare and compare the dimensions (rolling circumference), as they seem to think that they should all be the same as any difference could throw out the car (drivetrain / Haldex) if driven for any extended amount of time. For example if faced with a puncture and then rolling on the space saver for another couple of hundred kms...

As the rolling circumference of the Continental T125/70R18 99M CST 17 is 78.2inch; 125/70R18 Tires

Which doesn't even match the OEM 235/40R19 tyres rolling circumference of 82.9inch; 235/40R19 Tires

So my question is, are the supplied space savers all 18" or should they also be 19"?

As now the theory of the Tyre Retailer most likely has no relevance based on the OEM items as described above.

Yes the 245's are cheaper and have an increased availability / variety of patterns, but I am wondering if it is the right choice?

What I do know is that the Pirelli Cinturato P7 tyres need to go!!!

[ope126]

So I just bought a set (x4) of Goodyear Eagle F1 Asymmetric 3 (Made In Germany) 245/40 R19 98Y XL.
Fresh stock, Week 38 2018.

I haven't put them on yet as I am waiting until Mid June before we go on a Road Trip to Canberra and the Alpine Region...

PM if you are interested to know where I got them, as I got an excellent price!!!