I made the mistake of looking through an issue of Cafe Racer today, followed a link or two, and eventually came up on a flat track roundyround bike, and I REALLY like the looks of the flat track bikes that aren't lowered motocross bikes, and had a thought. how hard would it be to put one of those on the road? apart from finding a suitable fork with front brakes and re-lacing the front wheel to a hub with a rotor mount, and of course adding lights and signals and a plate mount, I can't really foresee a big problem getting a dirt flat tracker registered for the road, shouldn't be any harder than all these custom choppers running around, but a LOT more fun to ride and tons more menacing looking and probably a bit faster, too. just thinking out loud, but...
you gotta admit something like that could be wicked fun if you had a nice string of downhill twisties and came from a mountain biking/BMX background...
Do a search for street tracker
http://www.omarsdtr.com/
and a few others have street tracker parts.
The street tracker look is quite probably the only way I'd ever own a Harley. I really like the idea of a street tracker commuter.
I'm (slowly) building a 650 Yamaha street tracker. Here's my inspiration:
yes please. ask the owner of that bike where I can sign. that's seriously exactly what I'm going for, except possibly for different colors and converted to EFI for reliability and ease of tuning.
I shouldn't do this. Disclaimer: once you click this link I am not responsible for drool into your keyboard, depletion of retirement funds or any other financial damage you may sustain. 
Here ya go: http://www.mulemotorcycles.net/
I have been to this shop to get parts for my RDs. These street trackers are very cool.
http://www.motocarrera.com/custombikes.htm
you just made Miller very happy, now I'm looking at TIG and MIG welders. I was going to find an older bike, strip it and toss everything except for the engine/gearbox, head-tube of the frame, possibly the swingarm, and possibly the hubs of the wheels if they are wire wheels, and then build a flat-track frame from the donor bike headtube so I can still title it as the donor bike. as if I didn't have enough projects already...
A street going version of this makes me giggle -
are these just like lowered dual sports?
they are basically a single-cylinder or parallel-twin evolution of the original Harley XR-series flattrack racers, with less displacement and less weight, although seeing them with a big-inch twin isn't terribly uncommon. the closest production bike to these would be I think the new XR1200 Sportster, even though it seems more aimed at the streetfighter market. for a dirt-tracker, picture a standard bike, minus a good deal of weight, most of the rear fender, all of the front fender, no front brakes (or provisions for mounting a front brake), with wide dual-sport-ish tires on 19" rims at both ends. or, a lowered dirtbike with the aforementioned wide dirt track tires on 19" rims, both styles of bike compete on dirt roundyround. street trackers are just dirt trackers with a front headlight, front brakes, tail lights, turn signals, a quieter exhaust, and a license plate, most of the time they even run on dirt track tires, albeit of the hardest compound available to get some usable life out of them on pavement, but even then tires are usually a 3K-5K mile wear item, and dirt track tires allegedly get a bit greasy when pushed hard on pavement.
his looks like a fine machine. Put a set of forks with brakes on it and hoon to your hearts content.
http://cgi.ebay.com/ebaymotors/Yamaha-Champion-sc500-sc-500-flattrack-ahrma-/150513031741?pt=US_motorcycles&hash=item230b469a3d
Here's some inspiration in the classic GRM mold...
http://thekneeslider.com/archives/2010/06/03/1975-yamaha-xs650-street-tracker-by-cycle-sports/
http://www.gopherglass.com/
Is another suplyer of nice stuff.
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