Installing a new Shimano compact crank on an older bottom bracket? I would like to know if I could install a new Shimano compact crank on an older bottom bracket that has a center bolt extraction system? Do I need to change the spindle in the bottom bracket? Do I need a new crank extraction tool for the new crank system?
Thanks Mark
This assumes you mean the BB is square taper (one of many examples). Most crank pullers will do square taper, but you often need to use the tool slightly differently, such as by removing a cap. You probably can't change the spindle anyway, but you should be able to buy square taper cranks to suit you, and if not a new BB isn't too expensive.

The process is essentially the same for all vaguely modern cranks.