What are the differences in performance of 21 in. spoked front wheels vs 19 in. cast wheels? The bigger spokes are better for off-road, are they not as good on road? I'm looking at the Tiger 800 xcx and xrx. The difference is mostly front tires, suspension, and protection, and the price with all the accessories I want on both bikes is about $800 more for the xcx. If I'm looking to do more on road riding than off would it be better to go with the smaller cast wheel?