Actually, if you're riding on a road with a high center crown that has, say, 2 to 5 degrees of slope then yes... in order to keep your tandem going in a straight line your tandem would be leaning to the left by about the same 2 to 5 degrees and almost unknowingly exherting a slight amount of countersteering towards the shoulder of the road... which is what keeps you going in a straight line. As the one riding at the front of the bike and steering this off-camber orientation of the tandem and road probably isn't as noticeable as it is to your stoker, particularly if they have a habit of trying to see over or around you.

To fully appreciate what's going on you'd want to look at a bicycle riding slowly around the upper banking of a velodrome... taking note that to stay upright the bike must be at a rather sharp angle to the track surface. Because tracks are ridden counterclockwise the 'lean' is to the right instead of the left that you would experience on a high-crown road in the US.



When you're up on the banking like this for the first time you can get spooked because the only way to ride down and away from the upper edge of the track is to steer towards it... which seems very much at odds with logic.

We had the distinct pleasure of experiencing the 24* banking of the Lowes Motor Speedway on our tandem during STR 2004 when rally participants were invited to ride on the track by Humpy Wheeler... a reknown cycling enthusiast and one-time bike shop owner.



Trust me, you don't want to make a mistake or forget how countersteering works as it could be a long-slide down those very steep banks.