Wheel sizes with tyre height for formentor.

[Sartuzi]

Hey there,

Does anyone know if 19inch wheels and 45profile tyres would fit? I Know the VZ5 has 20" wheels but lower profile tyre, so was wondering if all formentor variant wheel wells were the same size.

 

[M6TT F]

Yup. Standard wheel and tyre size on many formentors

 

[oldgitdave]

245/40R19 94 is the standard for most formentors. I think the V1 has 18 inch wheels as standard but 19's will fit no problem.

 

[Sartuzi]

Yes, so out of factory they come 245/40/R19, I wonder if 245/45/R19 would fit, since looking deeper into the arches near the bottom it seems like it would be a tight fit.

 

[SRGTD]

@Sartuzi; be aware that increasing the tyre sidewall height will result in a speedometer reading error. According to the tyre size change calculator at the link below, with 245/45 R19 tyres your speedo will under-read by around 4% compared to the factory fit 245/40 R19 tyres, so when your speedo is indicating 100 kph, your actual speed will be 104 kph. It would be worth checking in your country (Lithuania?) whether or not there are any legal implications of having a speedometer that over-reads or under-reads the true speed being travelled.

Speedo error calculator – speedometer error as a result of tyre size change – Speedometer calibration - TyreSizeCalculator.com

Speedo error calculator calculates speedometer error as a result of the change in tyre size. It shows the actual speed your car is going after the tyre size change.

www.tyresizecalculator.com

 

[Sartuzi]

This is great, thanks! @SRGTD

 

[Wyld Stallyn]

Not all tyres are equal in size.

Michelin Pilot Super Sports were a touch wider than advertised.

The side profile value is the percentage of the tread width?.

 

[Wyld Stallyn]

Just priced up a set of Michelin Pilot Sport 4S for our VZ3 310 over £300 a corner! for the standard 245/40/19

However

Thinking back to my HotHatch days some rubber sizes were cheaper than others, so I did some digging...

 

[Wyld Stallyn]

255/40/19 com in under £220 , far more reasonable

Not sure what the Insewerants co might view it as?

Rolling radius difference is negligible

 

[SRGTD]

255/40/19 com in under £220 , far more reasonable

Not sure what the Insewerants co might view it as?

Rolling radius difference is negligible

I’ve seen this discussed on various forums before. Seems there isn’t a standard approach applied by all insurance companies to something such as fitting slightly sized tyres to those originally fitted by the vehicle manufacturer when the car was built.

Most (all?) car insurance policies will include a clause that requires the insurance company to be notified of any modification(s) to the vehicle. Usually there’ll be a definition in the policy of what the insurance company means by a ‘modification’; often - but not always - something along the lines of ‘any change to the original factory spec of the vehicle’.

The only way to know for certain if your insurance company would need to know is to ask them. I would ask before buying the tyres and getting them fitted in case they have any issues with changing the tyre size. Because of the very small size difference I personally doubt they would, and by telling them, you’re not giving them a reason to wriggle out of dealing with / paying a claim for non-disclosure of the tyre size change if you’re unfortunate enough to need to claim on your policy in future.

 

[KJA]

255/40/19 com in under £220 , far more reasonable

Not sure what the Insewerants co might view it as?

Rolling radius difference is negligible

Have a look at Costco prices.

 

[SRGTD]

Have a look at Costco prices.

@Wyld Stallyn - if they don’t have to be Michelin PS4S there are other premium brand performance tyres from Michelin, Goodyear and Continental in 245/40 R19 size in the £150 - £200 per tyre price range (fitted) from the likes of Asda Tyres and Black Circles. Black Circles also currently have a money off promotion on certain tyres.