it is possible that your chainwheels are slightly out of true but a competent mechanic should be abloe to correct that.
what was the BCD on your old crank? if it was a standard size you should be able to atleast get a 26.
__________________
“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk