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Alfa GT height & ground clearance

Hello fellow Alfistis,

If I were to change wheel only (of Alfa GT) from 16 (225-50-R16) to 18 (225-40-R18) without any other adjustment (suspension etc), what would be impact? Would the car look higher (or actually be higher) and what would be the gap between the wheels and arch (front & back) and from the undercarriage to ground? I try not to lower the car due to many high road bumps on the road. Appreciate your advices. Cheers.
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Re: Alfa GT height & ground clearance

the overall diameter/circumference of the 2 combos is very similar. 24.9" diameter vs 25.1". see here: Tire size calculator

this presumes the tyres 'deform' (squash) somewhat similarly when fitted.

so the rideheight will be the same. however, there will be 'visual' and 'ride comfort' changes:

*the optical illusion is that the low profile 225/40/18 tyres will make the car 'appear' to be higher even though it isn't, because it draws more attention to the air gap between the tyre and wheel arch; however, on a JTD and V6, this will still look OK (JTS rideheight slightly higher though not much)
*ride comfort will probably be worse, given the lower profile tyre; but some tyres are more comfortable/compliant than others, so it depends what you use

other minor differences are in the weight. the bigger wheel usually confers more weight, despite a potentially lighter tyre. so 'unsprung weight' is heavier.

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alfa , clearance , ground , height

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