I've got a couple of friends who do loads and loads of track days every summer and now they have started pestering me about coming along on a few next year. As a 21" front wheel don't really give much option for tires I am thinking about converting to 17" front wheel, and also I don't have the cash for a pure trackbike however much I'd like to get one. It looks pretty awesome if you ask me. Anyone done this? If so what are your thoughts?