Gear Hub fan
Join Date: Nov 2008
Location: Reno, NV
Bikes: Civia Hyland Rohloff, Swobo Dixon, Colnago, Univega
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Photos would help, particularly of the front of the fork crown and the seat stay bridge above the rear wheel. If no holes there then the caliper brakes cannot be readily mounted.
Many old coaster brake cruisers such as the OP's have chromed steel wheels with a profile that is not designed for caliper brakes and calipers work poorly on chromed steel wheels anyway. Upgrading to aluminum wheels and caliper brakes, if mountable, would cost far more than the bike is worth IMO.
Gear Hubs Owned: Rohloff disc brake, SRAM iM9 disc brake, SRAM P5 freewheel, Sachs Torpedo 3 speed freewheel, NuVinci CVT, Shimano Alfine SG S-501, Sturmey Archer S5-2 Alloy. Other: 83 Colnago Super Record, Univega Via De Oro
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