different inside diameter wheels

[Perry Kitson]

It is interesting that our southern cousins used the industry standard bearing sizes in the idler wheel as opposed to the heavier raced bearings in the Canadian carriers. I wonder if the road wheels are the same. The common industry standard for a 40mm bore is either 80mm or 90mm OD, a 6208 or 6308 bearing. The Canadian carriers, and maybe the Australian and British built ones, used the heavier raced 6408 bearings.