Join Date: Sep 2005
Bikes: Trek 730, Bike Friday NWT, Brompton M6R*2, Trek 830, Trek 720, Dahon HAT060, Dahon HT060,...
?rubber boot? Generally, there is no standard for the size of dynamo rollers. If the manufacturer provides no such boot, it can be a matter of luck to find one that fits. I doubt you would have a chance to find any in North America. In Europe, presumably better stores would have some in their boxes. Note that the boot would yield a quiet operation of the dynamo in fair weather and lead to slipping during rain.