Jack there is no offset, or shouldn't be, in the frame. The offset you're thinking of is in the wheel and is refereed to as dish. The string method of checking alignment works fine if you want to know if your headtube, seattube, and axle center are all aligned. It won't help with twist or any other alignment issues. best, Brandon"monkeyman"Ives Vancouver,B.C.
On Aug 22, 2006, at 9:13 PM, Carb7008@cs.com wrote:
> I read somewhere that one way of checking a frame's alignment is to
> string a
> string from one rear dropout, around the headtube, then back to
> other rear
> dropout. Then measure distances from string to seat tube...they
> should be the
> same on each side.
>
> Isn't this method as I described incorrect because it doesn't take
> into
> account an offset of the right chainstay that provides freewheel
> space? If you
> took offset into account, would this method then be OK? How would
> one calculate
> the offset based upon dropout spacing?
>
> Jack Romans
> Sacramento, California