Hello - I was hoping I could get some suggestions here as to what to do about my chain falling off my bike. I have a Diamondback Kalamar XL and I use it for commuting to and from work twice a week (11 mi one way). Whenever I hit a sizable bump or curb, the chain comes off it's track and I need to stop and put it back on track before continuing on my way. This seems to happen once a day on average. I have been slowing down for bumps and it helps a bit, but it seems if the chain were tighter or had more tension, it would not fall off track so easily. Is there anything I can do to put more tension on the chain? Thanks.