granny/chainstay clearance

2-3mm.

"KBH" <[email protected]> wrote in message news:4%wpa.343782$Zo.75300@sccrnsc03...
> What is considered a minimum safe granny to chainstay clearance? My
current
> setup has about 49mm chainline on the front, and about 5mm clearance
between
> the granny and chainstay using a 115 UN-72 BB and TA Alize crank. I am considering going to a 113
> BB to bring the chainline a little closer to Shimano spec, and to increase (maybe just by one) the
> number of low gears
I
> can use in the middle ring without having to trim.