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The only problem with this mod is that, as you can see from the pic above, the skate wheels are not worn evenly because of the braking mechanism of the scooter--one wheel is fatter and taller than the other. Because of this, on perfectly flat surfaces, the folded brommie tips over and stands on the two wheels instead of the on rollers, as shown below:
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I would use smaller wheels, around 60mm to improve the balance and keep any slightly worn wheels on the non drive side(when the bike is folded). Agressive skates use wheels this size or smaller and in sazzy designs. Get some worn one off a skater for next to nothing? lime green wheels look great!