dave i used to compete in mtb races and do my own mech work so i'll try and give you a hand as best i can. its possible the chain is not good but you said the bikes are fairly new. are these bikes full suspension, front suspension or rigid(no suspension)? if they're full suspension the "skipping" can be fairly common especially when pedaling hard and standing up as you compress the rear shock it will give the chain slack and may cause it to skip. assuming the rear shock is a coil-over type you can tighten it up some to take out some of the slack when the shock compresses. also check to see if the drive line is not too far out of line while shifting gears and while in each gear. you will need to hold the bike up to do this or turn it over on the seat. if you can't figure out if the driveline is correct you may need to find a bike mech and they can put in on a bike work stand. they can also check the chain/sprockets with a special tool for wear.
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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