15" ? or 16" ? alloys for YRV turbo

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Hi All,

Contemplating getting new alloy wheels and tyres for my 53 plate YRV turbo. Looking at getting something that will provide:

a).. More grip

b).. Fill the wheel arches better, but allow for a lowering kit later.

Any ideas?

Had in mind to keep with 15" alloys and try 195/55/R15 tyres. Or to go with 16". What are my options?

Thanks.