I weighed a bit more than 190 back when I was using 1320s, and had no problems. However I always used lighter spokes on the left side usually 15-16-15 on the left and 14-15-14 on the right.
Your Trek probably came with straight 14 gauge spokes on both sides. That rim wouldn't support enough tension on the right side to allow you to properly stretch a 14 ga. on the left.
Of course tire size and riding style had quite a bit to do with how well they held up. They didn't last long at all, as training wheels for my 150 lb teenage son.
At 10:18 AM 10/18/04 +0000, Thomas R. Adams, Jr. wrote:
>They came stock on my entry level Trek back in '78 or so. The rear was
>126mm spaced, and the rear wheel would not stay true. Even a 20 mile ride
>would have the rim rubbing the brake blocks half way through the ride. I
>weighed about 190 pounds then, and had 28 mm tires on. I replaced it with
>a Super Champion 58 and had no further troubles.
>
>So I would say the 1320 is definitely a light person's rim, 5 speed only
>in the rear.
>
>Tom Adams, Shrewsbury NJ
Mark Stonich;
BikeSmith Design & Fabrication LLC
http://bikesmithdesign.com