The S-MAX is a supercharged version of the Ninebot S and one of the newest additions to the self-balancing scooter lineup. It can be added to the Gokart Conversion Kit (sold separately) to achieve the same speeds and range as the Gokart PRO. The following specs apply to the S-MAX as a standalone product (not as part of a Gokart): 12.4 MPH Max Speed 23.6 Mile Range Anti-slip, maintenance-free tires Intelligent speed limit 88-187 lb (40-85 kg) Payload Safety assist mode Intelligent battery monitoring Power-on security self-test Artificial intelligence learning Customizable security settings Parking Stand already installed Please note that the S-MAX comes with flat, solid rubber "Drift" tires without tread (more appropriate for use with the Gokart). If you plan to use the S-MAX on its own as a stand-up scooter, we recommend the Comfort Tires instead. While also solid rubber, the comfort tires have a typical curved shape and tread for enhanced traction. Please select the Comfort Tire upgrade option if you would like these installed prior to shipment.