These are the stock tires from the Electric Motion X and XR. They offer superior size and traction across a wide range of surfaces at a relatively light weight for their size.
Description:Outstanding performance on a wide range of surfaces
Weight:90/90-21 – 8.2 lbs120/90-18 – 11.5 lbs
Features:

• All-new rubber compound and tread design helps provide exceptional grip, including on wet and slippery surfaces
• 15% improvement in longevity and more stable performance over time compared to its predecessor
• Homologated for road use, but is not designed for prolonged use in a single journey
• When used in conjunction with MICHELIN Bib Mousse, tire is no longer intended for use on the public highway (NHS)