Keeping the length of the cranks tuned to the stoker and the type of ride is increasing vexing. While I have kept multiple cranksets standing by to do this ride prep tuning; Of late I have begun to see it as somewhat exhausting. Thinking it is about time to update the primary rig with a 11-36 10 speed rear cogset and a 4-ring crankset (maybe 24-40-48-58 or similar silliness like we did with the TA Cyclotourist in the 70's due to lack of widerange freewheels) to enable the one bike configuration to go anywhere at any pace...and accepting the need to carry a few extra ounces of alloy to avoid the prelaunch wrenching. Also thinking that the Davinci Bicycles IPS system may be onto something I need to consider. I think it was Bill G who has one with the 4 rings on the front and the pictures he posted here were enticing to say the least or at least ultra cools... Allowing the stoker to self pace wiht the IPS probably solves most of the remaining crank length tuning problems. Would also allow my stoker to drop out without having to unclip and put her feet up on the lateral tube... as I am tiring of touching up the paint