Join Date: Oct 2002
Location: Someplace trying to figure it out
Bikes: Cannondale Super Six High Mod, Evo, Sram Red, CAAD9 Rival
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Weight is less of a determining factor for me than durability. I use a tube made by a company called Wrench Force. About 80 grams on the summer ones and I use a self-sealing tube in the winter/fall that is heavy at 125 grams...but when the road is littered with "stuff", it does prevent the unfortunate flat and having to change a tire when is is 0-5 degrees C (32-40ish F), not on my list of fun things to do.
I use the 23 tires..the 20's are lighter, sure, but less durable. The 25's are "cushy" making for a more comfortable ride..also good for longer touring.
Obvioulsy, the ligher then tube and tire, the less durable they become as the walls of each are thinner.
By the way, don't know if you get CycleSport...but there is a great photo of Oscar Friere on stage 6 of the Vuelta with a nice shot of the Michelin Pro Race logo on the tire.
I guess what you choose depends on taste and need. My need since my racing days are over are durability first, then weight. In other words, the lightest durable tire/tube I can get. A couple of grams here and there are not going to matter to me...but the Pro Race tires and the Axial Pros are race tested..if they are good enough for the Forest of Arenburg, they are good enough for Indianapolis streets.
Even Lance rides a clincher in training. He doesn't want to stop, either.
I think I answered all your questions. If not, let me know.
oh...I use the same type tire, front and back.