I weighed my Parker alloys with Bridgestone tyres and they were 22.5 kg.
The 18" OZ wheels I have on it now weigh 18.5 kg with tyres.
It does make a difference !!!
The car feels so much better, more agile & responsive.
Worth remembering that 19" wheels will gear the car up a bit, as they have 235/35 tyres which means a bigger overal diameter than 18" with 225/40, so acceleration will suffer.
And more thing that no one mentions....brakes..
The PP brakes are really heavy, calipers are 7.5 kg and discs are 10.7 kg.
(the non PP brakes are 5.5 kg and 7.7kg)
The Audi TT RS (Brembo) brake calipers are 4.5 kg and the PB Brake calipers are only 2.5kg (without pads though).
This is why my advice for anyone buying a GTI, forget about reverse cameras, pano roofs, leather, Santiago's, DCC, Dyanaudio and an outside toilet
and instead use that money for lightweight wheels and a brake upgrade, that's the way to make it fly