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How much difference is there between...(3 posts)

How much difference is there between...cyclejim
Jun 6, 2002 5:54 AM
In terms of JUST the frame, the Trek 2000, and the 2300? The 2300 uses ZR 9000 Alloy & the 2000 uses the Alpha™ SL Aluminum. How much lighter is the ZR9000 if at all and how is the ride quality compared between the two?

Thanks in advance
re: How much difference is there between...Tig
Jun 6, 2002 8:03 AM
The ZR 9000 is Gary Klein's new alloy mix he created. It is a little lighter (up to 1/2 pound less per frame) than previous models using 6061 aluminum alloy tubes. Gary says, "In tensile tests of complete identical frames, the yield strength is about 1/3rd higher than 6061. On our fatigue testing machines, the ZR 9000 frames endure 5 times the number of stress cycles before failure." He told me last November that ZR 9000 provides a more comfortable ride. I think that has to do with the ability to vary wall thickness better.

As a former owner of a Trek Alpha SL aluminum bike, I'll venture to say that almost any bike will ride better than it! OK, that's a bit extreme, but of all the many road frames I've owned, the Alpha SL is by far the worst. I would consider owning one of the new ZR 9000 frames (Klein over Trek) though.

For more on the ZR9000 alloy frames, go here: http://www.kleinbikes.com/at_klein/zr9000.asp
re: How much difference is there between...laffeaux
Jun 6, 2002 10:13 AM
The Trek catalog says that it's 15% lighter and 15% stronger.