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Looks like I might get to test-ride a Seven Duo soon.(3 posts)

Looks like I might get to test-ride a Seven Duo soon.Leisure
Feb 8, 2002 3:36 AM
I guess following a recent review raving about the Duo, my LBS's manager is thinking he'll order one and see how it does. I'm interested too. In truth, I expect the suspension motion itself will prove stellar, because the rear tire will be moving rearwards as it sinks into its travel. I can imagine the thing will track wonderfully and really flow over trails. But I also have some reservations about the design.
First off, the moving bottom bracket seems like a bit of a throwback to unified rear triangles. Perhaps it's just me, but I've never been big on them.
Second, the rear-end's lateral stiffness will be determined by two narrow joints in series with each other. Could be okay, but I have a hard time seeing it be as laterally stiff as some of the other designs out there.
Third and most importantly I wonder about the way the Maverick linkage they're using integrates the shock as part of the frame structure. What look like seat stays push directly into the side of the shock when the rider gets on. Some of it pushes upward to activate the suspension as intended, but more of it will be applying a rather big moment on the shock. So while the shock is compressing, it will also be receiving a sideways load that will constantly be trying to bend the strut right where the piston telescopes into the shock. I don't like this at all, and wonder if this may become a reliability issue. Perhaps they missed it because the virtual pivot point distracts from recognizing that the swingarm is still a moment arm, or perhaps they did see it and the shock has been designed in advance to handle the off-angle loading.
I'm a huge Seven fan. I've really taken to the feel of some of their road frames, and figure it's only a matter of time before I get an Alaris or Odonata steel. But to me the strut implementation on the Duo comes off as a design flaw, and I wonder if Seven jumped the gun when purchasing the rights to produce what is technically still an unproven design. Hmm...
Anyway, I'm still enthusiastic about getting to try the thing out. The suspension motion itself may turn out to be better than anything else out there. Most new designs start out with some quirks, and I can see them finding ways to fix any issues that come up.
re:... hey, wait a minute...Akirasho
Feb 8, 2002 6:22 AM
... Duo??? Dual Suspension??? Shocks???


I'll have to admit, when I saw that Seven was building their version of the Maverick... I wanted one... just because!

We abide.

Remain In Light.
Aaagghh...busted!...dah...gah...ooh what a pretty picture.Leisure
Feb 8, 2002 12:22 PM
Ahem, yes, I'm t(cough)lking about m(cough)ntainbikes. Can't help it, the indoors are driving me batty and I'm getting that itch to hit trails again. But woo that's a pretty picture. Is it big enough, though?