I’m running general grabber AT3s on 20” for winter and 22” turbines for summer. The grabbers are 275/45R20 making thethe speedo read 10% too fast.

I know Land Rover can change the wheel size when plugging in, cost of £150 I believe.

I bought a GAP IID but can’t figure out what to change which actually makes a difference. Nor do GAP (they said ask you lot).

Any ideas anyone??

Else there’s a GAP IID up for sale...

no need to change anything, your speedo will be will be 3 miles over true speed at 60mph,


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You don't say the tyre size on the 22" wheels..... .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

275/40 I think. Standard contisport on turbines.

Speedo is a long way off. I’m sure there is a 4% additional anyway (eg 104mph is 100mph
On normal sizes). But a full 10% off is a lot.

Anyway, does anyone know what item to change in the car Config to change this? I know it can be done - LR change it if you swap 20s to 22s.

there was an option on the 2010-2012 years but theres no option on the L405 as far as i can see ... ... - .- -.




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