Okay, maybe you guys can give me some insight. I have a Roadmaster 18 speed (go ahead laugh) mountain bike. I've noticed some wobble in the rear hub. I know they are probably the cheapest things around. I was wondering if anyone can tell me what is a good hub or wheel set that isn't that expensive? It has the 6 speed gear set and I don't know which free wheel it has. So any info would be great. Most rear wheel's I've seen have been for 8-9 speed gear sets. Does anyone know where to find a 6 speed?