It's because They are really fitted with further actions for basic safety since the heavier the scooter, the upper the speed, and as a consequence, the bigger the need for more advanced safety capabilities like twin stem locking mechanisms. Oh and this is the listing for Grownup folding electric scooters https://medium.com/@abiron5776786gg/where-to-buy-scorpius-a-electric-scooter-5b624b2e789a