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We have recently bought a tandem and the rear wheel skids out when riding. Any idea why this happens?
Comment below: When we are riding along in a straight line and there is an uneven surface it does this a lot. The heavier rider is on the front of the bike.
The captain's weight hardly pushes the rear wheel down at all, while the stoker's weight is almost completely on the rear wheel, so check their weight is positioned correctly. If the stoker is standing up, this can shift weight off the rear wheel, making a skid more likely. Standing up on tandems is "advanced", some would add "insanity".
Not enough weight is on the back of the bike. Try riding the bike without a stoker and see if you get the same behavior out of the bike.
I think it may have to do with the pressure in your tires. I experience this in an overloaded bicycle as the tire pressure drops (over time) the rear wheel will sometimes feel like it is slipping out from under me on uneven surfaces even if I am not breaking and the surface is dry. I never had this problem with higher pressure tires, it only has begun since changing to wider schwalbe marathon supreme tires.
Yes, more detail about your riding scenario will help. Are you trying to ride it alone at times? Tandem wheelbase length could be an issue if you are going solo. Also, if you and the other rider are not leaning into turns correctly with each other, then this can be causing skid/balance issues.
One last thing - the heavier rider may need to be in front. The front wheel is all your stopping power and so their weight will stablize the front end. If there is a great deal of weight difference in the riders, then you will have to experiment which position allows most comfort and handling.
