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It's normal. Don't worry about it. Age, Heat and exposure to the elements will do this. (Even automotive tires end up with these cracks after so much time.) One thing that DOES help is cleaning all the grass off the tires and applying Armorall or similiar tire cleaner and protectant, but really it won't extend the tire life. (Usually the tires wear out the tread before they get cracked far enough to split or leak, and even then, a tube can be installed in them if they DO leak.) It's actually a little too late to reverse the damage (You can coat the tires with motor oil to swell the rubber, but that will soften and rot the rubber over time and make things WORSE) Depending on the age of the tires and their exposure to the elements, I'd just as soon run them with tubes in them and when they finally split open, get new ones. (Probably last you 10 years with tubes in the tires before the "dry rot" gets bad enough to split the tire)
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