I own a 1972 Holdsworth Mirage. It has a "wart" on the underside of the downtube, which is the stop to keep the shifter boss from sliding down..........
Maybe it's not a track bike?
Chris Beyer Bloomfield, NJ
Jim Foreman wrote:
> Message text written by INTERNET:M4Campy@aol.com
> >Also, bought it sight unseen but looks to be in great
> shape except for a few very minor chips and what looks
> like a nubbin on the bottom side of the down tube that
> is about 9cm from the head tube... Looks like a wart!<
>
> Hate to tell you this but it's most likely a result of a hard lick
> on the front wheel, pushing the bottom of the headtube back and bending the
> downtube. When you bend a tube, it stretches very little on the tension
> side with most of the failure showing up as a buckle on the compression
> side. Look closely and you might find one on the same location on the
> bottom of the top tube. Other places to look for these signs is the back of
> the fork blades just below the crown and on the back of the steerer just
> above the lower head bearing.
> The failure point in a tube is usualy about one tube diameter from
> the strongest point. IE: the weld or lug.
> Jim
>
> http://www.geocities.com/