i need advice, i have a 2018 klx250 here in thailand which i have fitted with 17” wheels and tires and swapped the 42t sprocket for a 39t, the problem i have is the speedo is calibrated for a 21” front wheel not a 17”, is there anything i can do to put this right? Incidentally here in thailand we have the d-tracker or dtx250 which is a supermotard model