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As you've said, I'd expect a highly respected aftermarket performance manuf. to have done their R & D work, and have made their springs longer for a specific reason, which only they may be able to explain.
My best guess is that Ikon has a slightly different 'progressive' spring rate in their design and that accounts for the extra inch. (Insert obvious joke here). I put a set of Ikons in my buddy's Bonnie and the improvement was the same kind of handling upgrade as putting the Progressives in my America.
I haven't ridden both brands on the same machine so I don't know how the Ikons compare to the Progressives. The Progressive brand replacement springs are an exact fit and that makes for a seamless swap. For me, front spring replacement is the best bang-for-the-buck handling improvement you can make.
A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. Herm Albright (1876 - 1944)
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