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I used the Baker calculator not long after I got my 2003 Wide Glide. I was going to get the Baker OD6 six speed overdrive gearset. When I looked at the RPM calculator I also realized due to the low gearing of the Dyna models at the time I also wanted to add one tooth to the front pulley as well. I did both mods and it completely changed the character of that bike for the better.