Originally Posted by
TejanoTrackie
Well, honestly, I never measured the spacing on my older coaster brake bikes like my Koss Cruiser, so I can't say for sure that they were not 110mm. The only coaster brake bike in my current stable is a SE Draft Coaster with a Shimano hub, and it measures about 115mm, although the reaction arm is stamped CB-E110, which suggests that the hub might be available with 110mm spacing. So, I will defer to your coaster brake expertise.
Something I have spotted in person with a Bikes Direct bike (Windsor) and an LBS that has a fleet of aluminum cruiser rentals. The hubs are spaced out differently than stock trim to accommodate different frames. It's achieved, obviously, with extra (or thicker) washers in between the cone and locknut on the drive side and in between the reaction arm and locknut on the NDS. The Windsor had two 4mm washers to fit the 118mm spacing.
The hubs aren't supplied that way by Shimano, so it's gotta be the wheel factory making modification to suit customer specs.