I am thinking of changing the 18" Wheels on my 2016 Superb and am wondering if by changing to 19" will this change the speedometer reading and also things like displayed fuel consumption figures.

In my mind I'm thinking that a larger wheel will turn less for a given distance or travel further foe each revolution of the wheel.

 

can someone help me with this please?

Many Thanks

this depends more on Tires not Alloy's inches

https://tiresize.com/calculator/

 

have changed stock Pirellis to Michelin

215/55R17    diameter: 26.3"

225/55R17    diameter: 26.7" (+1.5% +1cm)

 

now Speedometer shows only +~2km/h when compared to GPS

before were +~5km

list of tires which comes with Superb III

2.0TSi    217hp    Diameter
215/55R17    26.3"    0%    ****
235/45ZR18    26.3"    0%
235/40ZR19    26.4"    +0.4%
255/35ZR19    26.0"    -1.1%
245/35ZR20    26.8"    +1.9%
2.0TSi    276hp 4x4
255/30ZR20    26.0"    -1.1%
1.4TSI    123hp
215/60R16    26.2"    -0.4%
1.4TSI    148hp ACT
215/50R18    26.5"    +0.8%
1.8TSI    177hp
235/50R17    26.3"    0%
2.0TDi    188hp
235/35ZR20    26.5"    +0.8%

 

not in list, but ok

225/55R17    26.7"    +1.5%
235/50R17    26.3"    0%