20” wheel

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Turbofarmer
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20” wheel

Post by Turbofarmer » Thu Oct 10, 2019 6:21 pm

I have 245/45-20 on my DS I am looking for a spare to carry when I am towing and have been offered a 235/55-19, it will fit ok but it stands about 35mm taller is this going to cause problems with the transmission?


Past master
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Re: 20” wheel

Post by Past master » Sat Oct 12, 2019 9:17 pm

If you are using the correct spec tyres there will be no appreciable difference in circumference for different wheel sizes.
Without checking it looks like either your tyres or the spare are non-standard?
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Dashnine
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Re: 20” wheel

Post by Dashnine » Sat Oct 12, 2019 9:47 pm

Turbofarmer wrote:
Thu Oct 10, 2019 6:21 pm
I have 245/45-20 on my DS I am looking for a spare to carry when I am towing and have been offered a 235/55-19, it will fit ok but it stands about 35mm taller is this going to cause problems with the transmission?
Both tyre sizes are the manufacturer sizes, they’ll have almost identical rolling radius so won’t affect the car. As long as the wheel is the correct DS or a Evoque type it’ll be fine.
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Nick_S
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Re: 20” wheel

Post by Nick_S » Sat Oct 12, 2019 11:22 pm

There are plenty of tyre calculator websites that will tell you the answer (if you can believe them)!

All the ones I have looked at, say these two sizes are not mixable!

Also how does the law work in regards to different sized wheels/tyres on the same axle (space savers accepted of course)?


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roadster
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Re: 20” wheel

Post by roadster » Sun Oct 13, 2019 8:48 am

By my calculations the 19" wheel with that tyre will have a rolling diameter approximately 1/2" bigger than the 20" wheel with its low profile tyre.
2018 MY Diesel auto 180 SE tech


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