I own both Campy NR 144 bcd 5pin and TA Cyclotourist 6pin cranksets. I want to add the triple inner chainring drill holes to both of these crankarms.
Does anyone know what are the appropriate metric tap sizes to properly thread the bolts for either Campy 36T or TA 36T inner chainrings? I have all the parts needed to accomplish this but having problems finding the proper thread sizes...
Thanks, Steve Neago