Since SC doesn't use the exact year model method like most brands, you'll probably just have to refer to the Gen 1, Gen 1.5, and Gen 2 designations. The current model is generally referred to as Gen 2 or such. Your question may be too general. The '09 Nomad...Gen 2...hasn't really changed to any degree, has it? But then when you consider that there's also a carbon Gen 2 design, well, that's a pretty big change...even though all the pivot and other critical points are in the same place.
There have basically been 2 main Nomad model changes, but the Gen 1.5 has a 1.5" head tube with a stronger top tube over the Gen 1. The Gen 1 would occasionally crack at the top tube pivot, and that was improved on the Gen 1.5. Very specifically I think there have only been 4 Nomad models...the aluminum first generation...the aluminum 1.5 head tube generation...the aluminum current generation (Gen 2)...and the current carbon generation. Is that about it?
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