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If you own a Sur-Ron , you already know how fun these electric bikes are. They’re lightweight, fast, and incredibly capable both on and off-road. But after riding for a while, many riders start noticing the same thing — the bike feels limited. The acceleration could be stronger, the top speed feels capped, and the throttle response isn’t as sharp as expected. The reason for this is simple: the stock controller is heavily restricted. Manufacturers design stock controllers to m