And you're saying that rails won't have that problem too? The threads on the one bolt in the pivotal post will lock out water better than the hollow seat rail clamp on railed setups.
holy crap. we have been reserected! honestly, it doesn't matter which one is the lightest. we are talking only a few grams difference here. Idk about your 24seven, but you will probably need a shim.
Pivotal seats look good, theyre neat, and light. Railed seat are usualy a bit heavier, look a litle ugly(sometimes), and but are stronger. I guess its a case of add a litle weight for more strenght, although iv never broken a pivotal. Some bikes just dont go with pivotals, and some bikes dont go with rails.