Can someone explain what a cassette transmission is? or lead me to a site with an explanation. I have been to cannondales site and found nothing.

Also, does the efi adjust itself for altitudes or do you have to do something?

I ask, because I live at about 6000 ft and ride at different altitudes all the time. I am sometimes as low as 500 feet and up to about 8000 feet.

Thanks for all the info and I will ask more soon
Bat