In addition to the off road tires for Ninebot miniPRO that are available at More4mini.com Clients can purchase hybrid replacement tires. Hybrid tires will also fit Xiaomi miniPRO.
You can purchase hybrid tires here.
After you install hybrid tires or off road tires you may wait to replace default fenders with More4Mini off road fenders that give more clearance and protection.
Hi would it be possible to buy extra rim &off-road tire combo?
I would have been nice to know before buying the hybrid tires that the fenders will need to be modified or removed.
I really hope you start offering a modified fender similar to what is seen here: http://forum.electricunicycle.org/topic/5672-diy-ninebot-miniminipro-offroad-fenders-lite-version/