Nashbar AT1 29er Mountain Bike. If you're looking for a 29 mountain bike that won't break the bank, the Nashbar AT1 29er mountain bike should be your first choice. The steel hardtail 29er Mountain Bike frame is incredibly durable and has excellent trail feedback. The Shimano 7 speed drive train provides more than enough gears to give you plenty of speed on the flats and still power up the hills with ease. The 29 wheels allow you to roll over some pretty gnarly singletrack with ease. It's an incredibly affordable 29 mountain bike that's ready to rock as is, or perfectly ready for some upgrades if you're in the market for a project bike.