Fitting a triple
I'm just installing my first ever triple crank. I notice that the distance between the granny ring and the chainstay is very tight (maybe only a millimeter or so), although it doesn't touch. Is this normal, or does it indicate that the spindle is too short? My current spindle (111mm) was bought separately from the chainrings/cranks, which themselves were made up from an old double plus a newly purchased granny. If I do indeed need a longer spindle, what length would make a noticeable difference - 113mm, 116mm? The current chainline is about 45mm, if that's relevant, and the tubes are regular diameter (this is an old frame from 1982).
Thanks for any help you can give me. I used to swap out doubles all the time in years gone by, but this triple is really giving me a headache!