Segway miniPRO and Ninebot miniPRO by default come with the cheapest tires pre-installed. Tire replacement is the most common issue miniPRO owners have to deal with.
More4Mini have designed and manufactured special off road fenders for Segway miniPRO and Ninebot miniPRO that work with more robust off road and hybrid tires. Default fenders don't give enough clearance but More4Mini off road fenders do. Off road fenders come with metal "L" shaped holders pre-installed.