So, I'm shopping again for tires. I've searched on here but I couldn't find a "solid" answer. Why is there a need for tubes when my wheels are spoked? (fatties) After that......I understand that it would be good to change them out when I change tires due to a safety issue, but is it a must? Indy says one thing, dealer says another and yet another story when I see another. Dealer wants $650 for two tires installed ( no labor special). Indy wants 400. My plan is to do the tires and tubes, but I was just curious. Ya'll have a great week.