Would be good to open them up one day and count the different teeth etc on the cogs. I'd be willing to bet they are all the same. My 250sx one (22inch tyre) counted exact same teeth as my 250es one (25inch tyre) so yeah go figure. I feel like the hondaline speedos were more of a gimmick than an accurate way to measure speed. Still love both of mine though. Really set the trike off!