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I think any ski will be long enough to cut the front down to 2 ft and the rear around 3 ft. Snowboard will work too but I've heard they are a little slower.. but still loads of fun!
It will be more challenging than using snow skis if you don't have a flat surface to mount the studs to, but give it a shot!
Four winters and hundreds of runs later and still going strong....
A better Ski Bike