A splitboard boot binding system with single multi-angle climbing wire. The pivotable climbing wire is configured for use with any compatible ski tour interface, and folds away under the boot binding baseplate when the bindings are transferred to a ride mode interface. In ski tour mode, the baseplate pivots on a toe axis and is supported by the climbing wire when the heel is raised. Advantageously, the climbing wire is very lightweight and seats interchangeably in a plurality of detent positions on a compatible heelblock. There are no interferences with conjoint use of a slide-in crampon seated between the heelblock and the toe pivot or with use in systems having a heel locker. Surprisingly, in some combinations the climbing wire may also be used to retain the slider track in ride mode. The combinations and sub-combinations require no tools for adjustment or operation and operate cooperatively.