Hi from Sweden - i bought this 2000, GASGAS EC250 Endurobike 2 months ago - i only paid 500US for it.. as it had been stood still for 10 yrs in the sellers garage.
since then i have made my own electric wiring, had it inspected for road use, and fitted my Supermoto-wheels.
I had these wheels off an Aprilia RS125 -12 laying in the garage for another project, so i tried them on - and even the axlebearing were the same as the stock GASGAS ones,
so i only had to make some axlespacers to fit.
The wheels are 3x17 with a Pirelli Angle GT 110/70-17, and 4x17 with a Pirelli Angle GT 140/70-17 running just 1,6bar tirepressure it grips like crazy !
The front brake is a 330stock RS125 disc with a CBR929 right side caliper, turned up-side-down to fit.
Rear brake is stock caliper with same size disc.
Gearing is 12/40 which gives me a top speed of around 100 mph, well enough :-)
Vids are always fun - so here are a few from a gokart-track i attended last Monday ... 30 bucks for a 4 hour session is kinda cheap :
https://www.youtube.com/watch?v=ua9wAYIle18&t=248s
https://www.youtube.com/watch?v=IIk8lbC66Yo
and a vid of me streetriding.
https://www.youtube.com/watch?v=nngr13f0LW0&t=49s
regards / kristian --- Sweden.