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Zipp 303 Z3s(6 posts)

Zipp 303 Z3scrabeedough
Sep 24, 2002 2:56 PM
Just wanted to call the boards attention to these wheels. I am in awe and in fear of them? Tell me what the public thinks.

http://www.zipp.com/wheels/303_z3.html
Just a 303 tubularJS
Sep 24, 2002 5:03 PM
with ceramic bearings instead of steel. These bearings are about $100.00 a piece in small quantities which is the reason for the high price. The 303 is a nice wheelset but I prefer my 404's because they are almost as light and MUCH more aero.
How much do the ceramic bearings help? (nm)PODIUMBOUNDdotCA
Sep 24, 2002 5:11 PM
Mostly weight in this application.JS
Sep 24, 2002 5:22 PM
I believe they are using a ceramic hybrid( ceramic bearings steel race) typicaly they are able to attain higher speeds because they can be naufactured to a higher tolerance but the speeds of a bicycle wheel don't come close the the speed rating of these. They are also supposed to be more durable. As I said the biggest selling point in this application is weight.
Just the bearings?Ian
Sep 24, 2002 5:34 PM
Aren't the hubs also different? And the rim weight is different from a 303 and the spokes are labeled as different. Seems like an whole different wheelset to me, maybe based on the 303, but more different than just the bearings.

Ian
The deal on Zipp 303 Z3sJohnIV
Sep 25, 2002 4:29 AM
The rims are 260 grams as opposed to 280. They are using lighter spokes, while still maintaining the spokes' original strength. And the hubs are totally different than the regular 303's. The bearings are a silicon nitride bearing, and they are super slick. the hub itself has added some carbon fiber to lighten it up some. As for how sweet the new hubs are, they used a piezo torque-meter to measure resistance at 30 kph, and found that on a 4% grade, the bearings will offset 1kg of additional weight...over a pair of Chris King hubs. This is from the R & D team at Zipp. So, to answer your question, they are a lot different than the original 303's. The two just share the same rim profile. And the Z3's retain the strength of original 303's. Hope this helps.