I expected the tires to flex a little. I thought it was a rubber tire with foam inside to allow for some flex. I don't know what's in it, but it feels like hard rubber, no curves. Imagine riding on a solid wood tire. This is what it looks like. Also, instead of bearings, it comes with these metal bushings, which I think get the job done. I ordered some replacement bearings to replace the full metal bushings.
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