Absolutely correct. But you don't need more stroke if your shocks are properly adjusted. Mine have never bottomed out even two-up with luggage and riding over the poor surfaces we have on many rural roads in England.
I chose 772's after doing a lot of research, including this from a Road Glide forum:
"Gary, as an Ohlin dealer, I too at first thought the HD-774's were the right shock. Well, the HD-772 is a 13" shock that once sag is set will set you like a 12" shock. It gives you slightly more than 3"s of total travel (once sag is set, a little over 2" of travel). It also has an adjustable bottom eyelet that lets you gain another7/8" of height adjustment as well. This shock has the piston that separates the oil from the nitrogen almost which makes it act like the shock with the separate reservoir. It is fully rebound adjustable so you can choose a highway smooth ride where the little small imperfections in the road disappear or you can stiffen it up for a race bike style ride in the twisties. The other thing I really like is the ease of setting them up for two up riding and also added weight for luggage. To do this you simply adjust the sag adjustment one turn for every 25lbs of added weight. Once set, it will ride exactly the same two up as it did one up. Also as a side note, I do a measurement of the spring length when the sag for one up is set up and you are satisfied with the ride. That way if you forget how many turns you put on the sag while adjusting for two up riding, you can simply back off the sag until the spring is at the length of your original one up setting. I personally became a dealer because of what the shock offered me in the ride and handling. I also did the cartridge front end now and realized the same performance as the rear. I previously had been using the progressive mono tubes."
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