For 17 in. motorcycles wheels Maxxis makes an off road tire suitable for mud and snow. A liquid cooled bike with a heater and full body would be doable here most of the time. Most people just aren't brave enough to get the skills to do it. Same applies to mountain bikes in the winter. My father-in-law would tow the kids' snow saucer around the yard with his dirt bike. As for a trike the tire tread and weight distribution over the drive wheel is key. Lighting, heating, wipers, and defrosters are important too. Ground clearance should be enough to keep snow from getting packed under the vehicle. Battery efficiency is reduced by lower temperatures but motor efficiency is increased.
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