Howdy from Tucson!
Thanx for the replies/interest in tandem tire wear.
Agreed that road conditions, rider weight, and even temperature can greatly affect tire life. If it's 100+ plus out, just imagine the temp of that blacktop your tire is rolling on!
Wavy tires, from our experience, tend to sometimes happen near the end of a tire's lifespan when cords and plys tend to separate a bit due to stress/wear, morphing into bulges that get progressively worse. So for safety sake, dump that tire!
Have also had success putting a dab of superglue or rubber cement (from your patchkit) on minor tire cuts on outside of tires.
It is always interesting to hear other tandemers experiences/opinions!
Pedal on TWOgether!
Rudy & Kay, Zona tandem