Buying roller quads for outdoors help?

Hello,

I use rollerblades, but I want to buy quads. I roll on road with occasional bumps or pebbles for 12 km (7.5 miles) with average speed 17 - 20 km/h (10.5 - 12.5 mph). What kind of wheels and bearings should I get? I'd like to keep the speed if possible and be able to do spins and other maneuvers.

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