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Just got two brand new trailer wheels and tires for 57 shipped...not bad. Also I ended up just ordering the carbon supermoto belly pan off of eBay. My attempts at making something failed. I had one really good effort, which included a huge warming tray (see below), that I cut, and folded the front up, riveted together, and sealed it. But it had some sharp corners on it and I wasn't comfortable getting on the track with other people with that hazard, so I scrapped it.
One of these