Walmart gives you a 90 days guarantee. You can take it back and upgrade to one with gears and the 90 days starts again from the day you picked up the new bike. You can do this over and over at no charge.
But it's important that you take any Walmart bike to you lbs and have them lube it and tune it for you.
I just switched my 29" OneX single speed cruiser for the 29" GX7 with 7 speeds.
Last edited by ChillinWillin; 05-01-14 at 06:18 PM.