I bought these for a project that doesn't require precision but I'm still shocked at how bad these wheels are. The bearings came too crooked to even fit onto an axle so I had to remove them and reset them. The rubber molding is wobbly and has a high spot when spinning (runout) I imagine if I actually used these wheels riding on a scooter I would be bouncing down the road as if they had a flat spot. I didn't return these because for my project it doesn't matter but I wanted anyone who would use these on a scooter to know not to get these.