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A 16.5" wheel gives a larger contact patch at higher lean angles. On the road you would rarely be able to achieve such angles and on track, unless your running respectable superstock times at a minimum, you would unlikely benefit. The other issue, unless I'm wrong, is that you will not be able to find a DOT approved tyre to fit and the latest generation of 16.5" slick tyres are very expensive to say the least. You would be better off sticking to a 17" specification wheel and fitting a track tyre such as a Bridgestone R10 for example.