pan y agua
Join Date: Aug 2005
Bikes: Wilier Zero 7; Merlin Extralight; Co-Motion Robusta; Schwinn Paramount; Motobecane Phantom Cross; Cervelo P2; Motebecane Ti Fly 29er; Calfee Dragonfly Tandem
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OOP: I'd like to com up with some theory of why the stoker should be slightly advanced. Truth is the slight OOP was the result of a lack of attention to detail, and an issue with a skipping timing belt (both of which have been corrected after the pic).
Zipps: They are essentially 808's. Specifically they are 520 clincher rims (the rims used for 808's) 24hole front, 28 rear (compared to 16/20 for stock 808's) built on White Industries Tandem Hubs with 145 mm rear spacing, and Sapim spokes.
We bought them from Precision Tandems. It's my understanding that they were built by Dave Walker at Paketa.
Homeyba is correct that Zipp does not reccomend this due to the angle of the spokes to the 145 hub, and it voids the warranty. In talking with the Zipp rep, the concern is that the spoke angle could crack the rim around the spoke holes.
We now have around 3000 miles on the wheels, and overall they've been great. Subjectively they feel fast, and give you that CF "whoosh whoosh" which I think helps as a placebo type effect. They're stiffer than our Rolfs, and the bike corners better with them as a result. We didn't intend to use them as everyday wheels, but they're fun to use, and tend to stay on the bike probably longer than they should after a race.
We recently did have a problem with the rear wheel. We broke two spokes on the same ride. Both non drive side, and both failed right at the Hub. When the first spoke broke, the wheel stayed true. After the next adjacent spoke non drive side broke, the wheel was out of true enough that we had to open the rear brake QR. but the wheel was fine riding the remaining 10 miles home. I think that says something about how strong and stiff the rims are. And close inspection of the rims shows no problems around the spoke holes.
I was concerned with 2 spokes breaking, but I'm thinking the second may have failed from the added stress after the first broke. We've got 200 or so miles on them with the new spokes without incident. If we break another, I'll rebuild the wheel.
Considering a team wieght of 340-350lbs, I think the wheels have performed admirably. If you can live with the reality that you may have to replace a rim at some point not under warranty I would consider them. If you consider them a long term investment that you'll ride everyday for man years, I'm not sure I'd bet on that.
You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.