Where I live (Ontario, Canada), I am lucky enough to have access to a number of packed limestone trails (former railways). These are fairly flat and great for bicycling. They are mixed use, so sometimes they are very uneven - mostly from dried up horse tracks or farming machinery.
I am currently using a cheap supermarket bike; the ride is really bumpy and uncomfortable at times. I was thinking of upgrading to a proper mountain bike, but I am wondering if that would be overkill as the trails are pretty flat. Should I go with a bike with front suspension only, or both front and back? Any suggestions are appreciated.
I also have a hybrid bike (Specialized Sirius Sport) but the thin tires and clip-in pedals make it less than ideal for those trails and I feel like I am damaging it.