There is a shop near the velodrome north of Minneapolis that will modify chainrings to fit either bolt circle. MN guys- speak up with the name (or their machinist).
Joe Bender-Zanoni
Great Notch, NJ
>
> Greg Parker enthused:
> >
> > Note also the one shown right below that:
> >
> > "Campy Pista crank with 144-bcd and 151-bcd"
> >
> > Now *that's* versatility!
>
> I've made a few of those, once by hand filing, a couple with a milling
> machine. I don't recommend the hand filing technique unless you're pretty
> good with a file and quite patient - a little too much off and you've got
a
> sloppy fit, with most likely only one bolt out of five taking all the
> strain. Any machinist can do 'em on the mill.
>
> Strada is easier than Pista, as Pista needs the counterbore on the
backside
> of the spider. I hardly have to mention you can't do the counterbore with
a
> file, that's for the mill only. Well, maybe Brian could if we dared him
to,
> but no one with only two arms could file that. Pista leaves the head of
the
> nut partly unsupported, possibly a little weaker than the factory setup,
but
> with a road double it's as good as new - and after the rings are mounted
> it's almost impossible to tell the arms are modified.
>
> You still have the 44-tooth minimum of the 151, but you can get there with
> far more common 144mm rings. You might could modify the arms a bit more
to
> squeak a 43 in there, I don't know, never tried, but no way on the 42.
>
> Mark Bulgier
> Seattle, Wa
> USA