The mx650 is taller than the 500 it holds a 220 pound rider where the 500 holds up to 175, the 650 is rated for 16+ years the 500 14+ years. the 500 is a scalled down bike where the 650 is like a regular bike about the size on an 80cc regular bike. They go no where near the speed of a gas engine bike they max out at 17mph which is rather slow. These are electric bikes and are only good for riding on hard ground.
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