measuring the "slack" is done from both directions... like pulling the chain down then back up and measuring the total distance? (rider sitting on the bike of course) also how important is it to change your tension for two-up ridding? im not going that far and I know that the driver weight affects it a bit...
thanks for the help!
i guess its a stupid question.. obviously it is likely the total movement high to low, and that is what ive been going off of.