Originally Posted by
scycheng
Your rear admiral cannot see individual rocks that's coming so have no ways to unload the rear wheel by standing and it's impractical to do so if there are lots of rocks. You, the captain, can't possible call out 'rock' every second. When you hit rocks, snakebites will happen. 65Kg+ seated (note '+' because weight shifts are dynamic) is enough weight to cause snakebites if you don't have enough air volume. On a tandem, you basically have twice the stress there is on a single bike. When we went from 700x35/37 Continental Top Touring, which are very good tires, to 26"x2" Schwalbe Kojak, snakebites never happened again. Kojak is not a better tire than Top Touring just bigger and fatter.
That's what I thought. But it also happened on overgrown ways. And I can't see stones there as well. No matter, it seems like we solved the problem by using fatter tires. The original ones had been in alignment with UCI regulations, but that's of no interest for private rides, we still can use the UCI compliant ones for races.