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With 1.5" risers I'd go with +8". \\; My wife has a Deuce and I have a FX Springer. \\; The stock risers on both were about the same height (4.5"). \\; I put 12.5" chubbys on my Springer and used +6. \\; +8 will be more than enough - doubt it'll go too long.
I'm partial to doing my own wrenching so my vote is DIY. \\; Buy a service manual if you don't have one already. \\; It'll cost you a couple bucks but it's far less than dealer install and you'll have it forever. \\; Between the service manual and this site you should be ok.
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
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Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.