Doc Sprocket
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A couple points here, no particular order-
*5/8" is fine for your front spindles. 5/8" MIGHT be strong enough for the rear spindles on a dead axle (1wd) kart.
*For a live axle kart, you want a 1" axle. 5/8" simply isn't strong enough.
*Those Harbor Fright wheels are trash. Okay for a furniture dolly, NFG on a kart. In addition, those wheels would be good only for the front on a live axle kart. They have bearing in them.
*5/8" is fine for your front spindles. 5/8" MIGHT be strong enough for the rear spindles on a dead axle (1wd) kart.
*For a live axle kart, you want a 1" axle. 5/8" simply isn't strong enough.
*Those Harbor Fright wheels are trash. Okay for a furniture dolly, NFG on a kart. In addition, those wheels would be good only for the front on a live axle kart. They have bearing in them.