I have an enduro bike that I want to put supermoto wheels on. I really miss the road and want to have a bit of fun when I'm not racing. I can't afford another bike (although I've been tempted by some cheap RGV's on ebay). There's loads of wheels on ebay, but I haven't a clue about which ones will fit. My bike is a 99 exc 300. What do I need to measure?