Awww...sorry to disappoint you guys, also i don't have the answer to this secret.

But actually, i was talking about my wheels.

My RRS was delivered in 2005 with the ugly 18 inch alloys.
Those where replaced by 19' and 2 months ago by 20' 10 spokes. all wheels where dressed with normal road tires.
What a difference!!
And yes, i have not the dampened steering rack, and yes it drives perfectly without any shimmy or vibration what so ever.

The question is: do i have to adjust the board computer (if possible) to display the correct distance/time/speed?
The circumference is different from the old wheels. When i do now 140 km/h it feels more like 120 km/h.
I know the difference can not be that big, but still..

Thanks

SW SW

Sometimes it is not enough to do our best;
sometimes we must do what is required.

2005 RRS HSE 2.7 TDV6
Now: 2016 RRS HSE DYNAMIC 3.0 TDV6

It's not the wheel circumference, it's the tyre circumference that matters - has that changed? Alfa Romeo Giulietta 1.8::MG Montego Turbo::MGB GT::Rover Sterling::MGF::MG ZT 190+
Discovery Series II Td5 GS::Discovery 3 TDV6 S::Freelander 2 TD4 XS::Freelander 2 TD4 SE
Range Rover Sport TDV6 3.0

Yes! You are completely right!

The original 18' wheels had 255/60R18 tires and the current 20' wheels have 275/40R20 tires.

After an internet search, i found this link: http://www.landroverwinkel.nl/My_Homepage_Files/Page9.html

It calculated a difference between the old in circumference of - 11.06 cm (!!!! !!!!!) per tire (- 4.61%)

This gives an reel speed of 95.39 km/h at 100 km/h indicated.

So at 140 km/h indicated, the actual speed is 133.55 km/h.

Also per 100.000 driven km's, i get a "discount" of 4610 km's!! since the cars odometer only indicates 95.390 km.

So is there a way to correct the cars system to the new circumference of the tires? Via board computer, or dealer software update? SW

Sometimes it is not enough to do our best;
sometimes we must do what is required.

2005 RRS HSE 2.7 TDV6
Now: 2016 RRS HSE DYNAMIC 3.0 TDV6

Quote:

The original 18' wheels had 255/60R18 tires