How do different wheel sizes affect a car?

I am a recent convert to your Q&As in the Telegraph. I have, on several occasions noted you commenting on alternative wheel sizes for specific cars. What factors are affected by the wheel size of a car?

Can you recommend a small, comfortable replacement for our Volkswagen Passat?

Being a little older and having driven Volkswagen Passats over the last 10 years, we now want a slightly smaller car but with the same comfortable ride; however, the distributors I have spoken to tell...

If I fit 17-inch wheels to my Hyundai i30 will I make the ride more harsh?

I am currently looking to upgrade my Hyundai i30's 16-inch wheels to 17-inch. Will this make the ride really harsh?

Can you recommend a small, comfortable automatic to replace our Passat?

We currently own a Volkswagen Passat SE TDI 140 Auto which is now over three years old. We find it very comfortable but want to trade down to a smaller, equally comfortable car. What would you suggest?...

Can I replace my Audi A6's low profile tyres with standard fittings?

I have just a purchased an Audi A6 Avant (08) 3.0 TDI quattro that has factory-fitted Michelin 255/35ZR19. Over 40mph, these tyres have a very obvious resonance which really is annoying. I'm not a great...

Recommend new tyres for my Audi A6 Allroad?

I would value your recommendations for tyre replacements for my Audi A6 Allroad. It is on 245/40s and at present has Pirelli P Zero Rossos at the back and Dunlop Sportmaxes at the front. I find it a great...

Can I fit 225-45-17 winter tyres to my Alfa Romeo 159?

I'll be driving to Austria in December and I have been offered four winter tyres (225-45-17) in very good condition. I have an Alfa Romeo 159 SW 1.9 JTD with 225-50-17 tyres. Will the different tyre section,...

Do you know of any problems with the Skoda Superb 1.8-litre petrol engine?

I have ordered a new Skoda Superb Elegance. As I do mostly short trips I have gone for the 1.8 petrol engine. Do you know of any problems with this engine? Also, I asked for 17-inch instead of 18-inch...

Which car offers better ride comfort than my Kia Cee'd SW?

I have read a lot of the threads on suggested comfortable rides. However, they are all rather dated. Do you have any particular recommendations for family cars with a better ride than my 57-reg Kia Cee'd...

What size tyre should I fit to my Ford S-Max's 16-inch spare wheel, to ensure the same diameter as its other 17-inch wheels?

I have a Ford S-Max with 235/45 tyres on 18-inch rims. The S-Max does not come with a spare wheel, but I have been offered a compatible 16-inch steel rim for free. Can you by chance tell me where to find...