Soo I really dont get this. I have the tire size, and rear end gears, so once I figure out what my driven gear is , and I put it in this formula , it will tell me what drive gear I have or what drive gear I need ??
http://www.bgsoflex.com/speedo1.html
the other way around If i only want to change the driven gear, do I put the drive gear I have and it will tell me what driven gear I have or need ?