It is because These are fitted with supplemental steps for basic safety For the reason that heavier the scooter, the higher the speed, and so, the larger the need for more Sophisticated protection functions like twin stem locking mechanisms. by Nathan Schaumann Use this Scooter comparison tool to help you https://socialinplace.com/story4879565/5-tips-about-buy-invacare-foldable-scooter-you-can-use-today