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+light weight +skinny tires what else? big wheels? really? cause that would be good cause I like mountain bike tires better! and what are spikey things?? I'm gona guess gears!! do those really make u go faster? I just stay on one setting which is the least pedaling but the most resistance. I...

what is the difference between the sport, SE, X, and Sahara.

I can't install adobe flash player. It says I need to close Fire Fox but I don't have anything else running. Can anyone tell me what's wrong or what I can do?