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Well officer, I know I was going the speed limit, no matter what that silly made-in-China radar gun says.
A portable GPS (even a cheap one) will tell your speed pretty accurate. You can probably borrow one for a test. The one built into in my wife's car does not tell speed, but most hand-helds do.
Had a customer come in complaining about the speedo on his sporty a few years back. Don't remember exactly but think the tolerance is either +/- 3% (possibly 5% but for some reason I remember 3%)
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.
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
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.