The issue is that runflat tyres require a special type of wheel that allows them to be fitted. You cannot fit runflats on conventional wheels. On the other hand, there is absolutely no problem with fitting regular tyres on wheels that are able to take runflat tyres. I've had regular tyres on my MINI's original 16" rims for years and it coped no problem with road and track use.
08 BMW 135i Sport Coupe | Manual | Sparkling Graphite | Coral Red Boston Leather | 10 Speaker Hi Fi