The DL650A's stock 15T front sprocket keeps you a little busier than I would like in slow speed driving (up to 50 mph) - especially the short shift from first to second gear at traffic lights, etc. I'm installing a 16T Sunstar to increase gearing by 6.5% and get more use out of the lower gears in local driving. (With its already generous low-end gearing, the higher sprocket ratio shouldn't affect sub-20 mph navigation either.) This change-up will also slow the engine down at highway speeds (65-80 mph) by about 300 rpm for less overall bike buzz and a bit more fuel mileage as well.
For all aspects of riding from street to highway, you would almost think the bike should have had the 16T from the factory and let those who want to gear it down do so for more low speed performance on strictly local commutes. Some folks have gone up to a 17T sprocket for extended highway travel, and that makes sense too, but a 16T is considered the best choice for mixed travel.
I purchased my Sunstar 16T on January 22, 2008 at Dennis Kirk for $25.94 shipped.
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