225/50-17" v's 225/45-18"

[Trolkar]

Hi guys!

Have looked into the resources library for answer but with no luck.

Currently my VR4 is running on 225/50-17" winter tires.

A local female toy shop had a complete set of 225/45-18" for a bargain. I only paid around 200 Eur for 4 Goodyear tires. The models didn't follow.

According to some guides, the 18" wheels are only 0,4% bigger.
I have the rims, but... is 0,4 to big?


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[Davezj]

the normal size for 225 18" is 40
so they will have a larger diameter than standard tyres so the speedo will read low when driving.
the standard tyre size 205/55/16 or 215/50/16.

so plug the numbers into a tyre size calculator and see if it is ok.

you can chose whatever size tyres you like if you are not bothered if the speedo read correctly, a smaller than standard you will accelerate quicker and larger than standard will give you higher top speed. but you must keep the size of the tyre the same across all 4 tyres. otherwise the 4wd system will be damaged due to the tyres rotating at different speeds.

[Trolkar]

Biggest concern is the space. My speedometer is actually not that accurate. Can it be adjusted?

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[Nick Mann]

My speedo is very accurate on 235/45 17 tyres. I'm not aware of any way to adjust it.

[chris g]

This is the issue that brad c posted about long time ago - by changing wheel/tyre size you get a speedo that is more accurate...

[Trolkar]

Again, biggest concern is the space....

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[chris g]

? space - wheel arches too small for 17" wheels n tyres...?

[Trolkar]

The current tires are 225/50-17".
Thinking of going to 225/45-18"

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[chris g]

Stick to 17's - less trouble and expense with wheels and tyres...

...and speedo more accurate with 17's and right tyre size...

[Davezj]

225/40/18 are fine and should not cause any issues with rubbing, as long as you don't Have any stupid offset on the wheels