Diamondback Wildwood Citi Classic 15" Bike - Small

I have a couple year old model of this bike. It has served me very well and has not needed much maintenance. All I’ve pretty much done so far is change the brake pads and lubricate the chain. Note that it’s pretty heavy. I have the option of taking a shorter route to the train station but it requires climbing up and down a huge flight of stairs. Because of the weight of the bike I take the longer flat route to avoid the stairs.