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chainstay lengths..(7 posts)

chainstay lengths..colker
Sep 3, 2001 6:43 AM
is 40.3 too short for you? is 41 too long? what do you guys think? it seems italian bikes are going now the short route while american high end frames keep the 41 standard...
re: chainstay lengths..Mike Prince
Sep 3, 2001 7:30 AM
40.3 seems a bit towards the short side. My Cannondale's stays are 40.5 and my new Steelman has 41 cm stays. Hard to say if the bikes ride differently because of this as many other variables enter into the equation (materials, overall geometry, wheels/tires, etc.)

I do think that shorter chainstays in combination with 9/10 cog cassettes may present some chainline/chainrub issues. The shorter stay will increase the angle of the chain, potentially causing the chain to rub the big chainring further up the cassette than people are used to. Also, 53/39 chainring combinations will also contribute to this type of rubbing. So where one bike may not rub in say 39/13, another with shorter stays could rub in 39/14 or even 39/15 depending on the chainline.

Other than that, the only other issue is tire size. A rear wheel with a 25c tire could be a bear to get on and off a bike with real short chainstays. Hard to say though as the design of the dropouts will influence this as well.

Oh well, that's what I think. I'm sure there will be a variety of opinions on this topic.
re: chainstay lengths..tirider
Sep 3, 2001 10:10 AM
Mike pretty well covered it... the only thing I'd add is that I prefer a somewhat shorter chainstay (mine is 41 with a 80.5mm saddle top to BB length) to make climbing a bit more efficient. The reason I mentioned my seat height is that the taller the frame effectively further back the saddle is positioned over the rear axle with the seat tube angle hence the smaller the frame the shorter the stays. A shorter stay usually provides a stiffer platform albeit a custom builder can design around this regardless of the length.
For reference . . .Kerry Irons
Sep 3, 2001 10:49 AM
Litespeed chainstays range from a short 39.3 in nearly all sizes of the Ultimate (nominal crit. bike) to 40.6 in the Vortex and Tuscany to 41.3 in the Classic. These numbers are a couple of years old and so may have changed slightly, but it gives you the range.
and for referenceAD11
Sep 3, 2001 12:06 PM
Airbornes, the gold standard here, have c/s of 40.5 for the Zeppelin, Valkyrie, and Spectre
At least 44Rich Clark
Sep 3, 2001 12:40 PM
Gotta have room for those panniers!

RichC
I remember Rigi, etc.club
Sep 4, 2001 10:44 AM
Rigi was a great Italian bike from the early 80s with stays so short, the rear wheel fit between a pair of small-diameter seat tubes. It was an awesome climber, and descended fine if you were good at it, but probably wasn't a smart purchase for a sketchy, squirrelly rider. Sure wish I had one....
Biemazzetta (sp?) BEAM-A-Zetta, also had short stays, not as short as the Rigi, but short enough that the seat tube had to be indented for the rear wheel to fit. Another great climber, I rode one for awhile, it was gold-plated! from the old NY bike show. Polchlapek (another questionable spelling?) out of France, I know, it doesn't sound French but it was) was similar to the Beam a something in that the wheel fit behind the indented fairing-shaped seat tube.
My Alpinestars MTB has 15.9" effective chainstay length, it's an e-stay design with a curved seat tube. yet another awesome climber.