wheels wont necessarily increase speed, its probably your bearings. not suprised from this low quality from a walmart board tho. Take your bearings out of the wheels, soak them in a bowl of citrus cleaner bearing balls facing down (NO HARSH CHEMICAL OR WATER BASED CITRUS CLEANERS CUZ THEY WILL LEAVE RESIDUE ON THE BEARINGS). just kind of spin them and rock em around the solution for a minute or two then let em soak for 10 minutes. TAke them all out and put them onto a towel with the balls facing down. one by one, take each bearing and run it through some water and IMMEDIATELY blow dry them to prevent oxidation. do this to every bearing. When you bearings are all dry from blow drying them, let em cool off. AFter that, apply about 2 drops of bones speed cream or any teflon based lubricant to each bearing. NO WD-40!!! Pop the shields back on and put them back in the wheels. now youre ready to fly