I'm currently running the PINK driven speedo gear in my Top Loader. My speedometer reads about 6 to 7 mph slower than I'm really going. 60 mph indicated is actually 66-67. Checking ERA's web site indicates PINK is 19 tooth. So, do I go with an 18 or a 17 tooth to get close to my real world mph reading?
Here's a link to ERA's chart: My tires are Goodyear Eagle II, 295X50X15 which I THINK is 26", maybe slightly smaller?
http://www.erareplicas.com/427man/gearing/spd_gears.htm