Changing wheel size with dynamic chassis control

[Pretzel]

Is it acceptable to change from 19" to 18" wheels on a car fitted with dynamic chassis control?
VW dealership suggests it shouldn't be done, I don't see why not if the tyre aspect ratio is increased.

Your thoughts appreciated

[jv]

Oh dear god.

NO, the wheels will turn square and you'll die!!!

Sorry, my mistake, it will be absolutely fine.

[Jim_mk7.5]

Oh dear god.

NO, the wheels will turn square and you'll die!!!

Sorry, my mistake, it will be absolutely fine.

 

The dealerships always know best... 

[rwleigh]

Oh dear god.

NO, the wheels will turn square and you'll die!!!

Sorry, my mistake, it will be absolutely fine.

LOL, what he said... 

[rajb]

Hmmmm, I wouldn't go back to that dealership in future.

There will be no issues swapping from 19's to 18's.

[Imteyaz]

I can confirm this because I did exactly this...

My 19" Santiago's were too harsh on local roads so swapped them for 18" and shod them in some decent F1's in 225/40/18 (got rid of the 'orrible Bridgestones with the 19's). I used VCDS to change the tyre circumference to the same as what 18" wheels would be coded to (copied from Votex):

17 - Instrument
byte 3
bits 0-2
"tire circumference"

225/45-18 = 25.972" Version 6
205/55-17 = 25.877" Version 7
225/40-18 = 25.1" Version 3

I can confirm that my wheels remain round and have not gone not square  , no issues with DCC or anything else and the ride is now much more supple in 'Normal' mode, previously I left it in 'Comfort' as it was just too jarring to use any other setting.

Imteyaz.

[fredgroves]

Is the coding needed for accurate speed display? Its not needed for DCC is it?

[mcmaddy]

Nothing needs to be coded.

[pixelcellar]

I'm looking to go the other way and put 19"s on a car that comes with 18"s, afaik I've not got DCC (it's a paid extra option right?), I assume I'll have no issues at all with anything on board the car re speed display etc. I know the wheels will fit as you can get them as a paid extra option (have 19" Brescia's going on).

[Andy198]

There’s no problem, it’s a very common change a lot of owners make. Just look at www.willtheyfit.com and put in the sizes. If going for 19’s then you just go to a 35 profile and it keeps the circumference almost the same. My speedo is out by less than 0.2 mph for every 30mph, so it’s negligible at legal speeds