[Krusty Driver]

Either the Pinnacle or the Trek 820 are decent bike, for what they are. The Pinnacle is an aluminum frame the 820 is steel ( so a little bit heavier). Components are just about equal. Both will do the job to pull your kids. If your idea of a trail ride is a non paved walking/hiking path then they will be ok. Anything beyond that and you'll wish you had something better. Do not, I REPEAT, do not buy a dept. store bike. Biggests POS ever! Stick with a name brand, especially if buy used. In which case follow Dark Puppets advise but beware of the Police auctions, it's very easy to pay too much for some of the crap they have. Spend the time, do a little research. Look on craigslist, ebay Kiiji etc... get an idea of what used ones go for and apply that to the auction. You will get a slightly better bike used than new but you shouln't pay anymore than 50-60% of what it was new. No warranty, servicing etc... Good Luck!