It appears my chain (I'm assuming) slightly slips every 2 1/2 rotations. After these rotations, half of a motion is wasted and then is locks back in again and I can resume pedalling for another 2 1/2... Any suggestions on what may be causing this? My local bike guys are a friggin' rip-off...
'''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Sounds like a stiff link. Every 2-1/2 crank rotations is once around the entire chain. Turn the pedals backwards slowly and watch where the chain exits the bottom pulley of the rear derailleur. The stiff link should be very apparent.