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9YA (2017-현재) · 3.0 V6

2026. 8. 26. 작업

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Interesting that it is on 18" wheels, where iirc road going versions are on something like 20"/21". Does anyone know the reason for this?

처리 내용

kambites said: trevalvole said: As per the article, the racer uses 380mm discs all round, whereas the GT3 road car has the same at the rear and 408mm at the front, so not that much bigger. Plus on the road car, I recall that the bigger diameter wheels are on the back. Perhaps the presumably lighter weight of the 18" wheels on the racer means that the tyres are in contact with the road for more of the time and that the bigger wheels on the road car are mainly for looks?The focus of handling tuning is different too. Performance road cars tend to be set up to prioritise responsiveness over outright grip so lower profile tyres are "better". Racing cars obviously focus far more on absolute grip.Smaller wheels with higher profile tyres (up to a point) helps that in several ways. Firstly it reduces overall unsprung mass, allowing the suspension to respond more quickly; secondly if allows the use of lower tyre pressures, increasing the size of the contact patch; and thirdly it allows the tyres to provide more of the suspension effect themselves. Reducing the amount of unsprung mass which has to move when you go over a bump from 20kg to 15kg makes a huge difference to how a car drives, but if you can get the entire bump to be absorbed by the tyre sidewall, the effective unsprung mass can be reduced to a few hundred grams. Would kerbs also be an issue? These cars will be riding kerbs at high speed and frequently so maybe low profile tyres would mean many smashed wheels which would add to the cost when being replaced often.