If you do fit rimlocks pay careful attention to wheel balance. Each rimlock weighs over 110gms and unbalanced thats a fair bit of vibration. It gets worse though! If you've got the usual 21" front and 18" rear the wheels rotate at different speeds so the vibration from the individual wheels goes in and out of phase.
You only start to notice it above about 55 -60mph but it gets worse rapidly as you speed up. It feels like a severe shake followed by a period of smooth running repeating over 4-5 seconds.
When they multiply the vibrations get very intense and 10 miles at 75mph was enough to snap the exhaust mount on my CCM (and give me double vision). You don't have to get the balance perfect - to the nearest 20gms was good enough to fix it to the point where I can't feel it any more.
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