YouTuber Turns a Grandpa-Spec Mobility Scooter Into a 45-MPH Wheelie MachineMotorBiscuitRahaan MazumderSat, September 26, 2026 at 1:15 PM UTCAdd us on GoogleIf you've ever been stuck walking behind a mobility scooter at the grocery store, you know they aren't exactly built for speed. But what happens when you strip out the factory electronics of an enclosed mobility scooter and replace them with the high-voltage guts of a Sur-Ron electric dirt bike?You get a 45-mph death trap that can pop massive wheelies on command.In a wildly entertaining project from the YouTube channel Marketplace Builds, the host decided to take a standard "Alpha Kabin" full-cabin mobility scooter and turn it into an absolute menace.AdvertisementAdvertisement"Today I'm going to be putting this Sur-Ron Ultra Battery into this full cabin mobility scooter," the host announced at the start of the build. "This thing is going to be absolutely crazy".The Sur-Ron Swap and Steering SurgeryTurning a heavy, top-heavy mobility scooter into an off-road rocket takes a lot more than just plugging in a new battery.The builder gutted the original low-speed internals and custom-fabricated brackets to mount a KR5V electric motor and a massive 200-amp Far Driver controller. He then paired the powertrain with a high-capacity battery borrowed directly from a Sur-Ron Ultra Bee electric dirt bike.Realizing that taking corners at 40+ mph with a tiny cable brake is a terrible idea, he also wisely upgraded the scooter's stopping power by installing a two-piston hydraulic brake caliper.AdvertisementAdvertisementHowever, the extra speed introduced a terrifying new problem: the factory steering setup. The handlebars pushed side-to-side, meaning if he tried to turn sharply, his hands and the new brake levers would smash directly into the glass of the cabin.To fix it, he completely chopped the steering column, welded in a U-joint, and added pillow-block bearings so the handlebars would twist like a standard motorcycle rather than pivoting directly into the windows.The 45-MPH Enduro TestAfter bleeding the brakes and tweaking the controller mapping, it was time for the maiden voyage. The immediate torque was so violent that the builder could barely comprehend the sheer speed of his creation."Oh, my god. This thing has no business being that fast. What have I done?" he yelled as the scooter shot down the road.To get an official top-speed reading, he mounted his phone to the dash using a GPS speedometer app. As the enclosed red scooter ripped down a private paved road, it officially clocked in at a staggering 44.6 mph (71.7 km/h).AdvertisementAdvertisementBut straight-line speed wasn't enough. The creator then took the top-heavy, glass-enclosed scooter directly into the woods for an impromptu "enduro" test. The sheer amount of torque allowed him to effortlessly pop massive, sustained wheelies down the dirt trails."I can't believe how well this thing wheelies. That was class," he laughed, dodging low-hanging branches. The ride was so violently fast that the scooter actually blew one of its plastic wheel covers right off into the brush.While the builder noted he might need to add a rigid rear axle and change the gearing for even more top speed, the "Super Scoot" undeniably survived its first real shakedown. It might just be the fastest—and most terrifying—way to get to the bingo hall.