speedo cure for changing ratios There is a very easy fix for your speedo after a cog swap. Speedo Healer. It's a plug-n-play unit that is very easy to install and use. The unit costs about $80 I think, but it's worth it! I have mine velcro'd on the inside of the upper fairing so I can pull up when I change sprockets. Programs can be calculated and downloaded from the internet. It's as simple as setting some small switches and pressing a button. It sure is nice when your not wondering how fast you just past the cop sitting in the median of the highway!