What everybody else said (esp. Megadan and ChinaRider27).
I thought it was common knowledge by now that these 200-250cc chinese dual-sports are capped at a 60-65 mph top speed, due to multiple factors (gearing, aerodynamics, weight, power).
You have a dual-sport machine, usually with knobby or dual-purpose tires, with relatively high weight, 15-ish horsepower, tons of plastics to give it "presence" and often just an oldschool 5-speed gearbox. What did you expect?
The easiest mod is to go to taller gearing, in order to shift the cruising speeds closer to 60 mph, but you can only do so by letting acceleration/off-road capability taking a hit. More street-oriented tires will also make highway cruising easier on the fuel and last longer.
But as Megadan said, you can find Chinese bikes with a more street-oriented design right off the bat, in standard, cruiser, naked, Hell, even "super sport" styles. Even at engine parity, those are often much better equipped for the street.
But yeah, the appeal of those dual-sports has always been their affordability and versatility. But think about them this way: on the street you get the performance of a well-tuned factory 125cc bike or scooter (many now push 15-ish HP too, which is also the limit for A1 licenses in Europe), rather than that of a Japanese-made 200-250cc A2-class bike.
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