When I had a cut tyre on my Pinnacle Stratus 3 bought a few years ago I had to resort to Lettice, the French mixte I rescued from the tip until I got a new tyre.
I decided to weigh both bikes in similar set up, including rack. I did this by standing on he scales and holding each bike in turn. Guess what, both readings the same at about 90Kg. Now I weigh about 77Kg in shorts and shoes so the bikes both weigh about 13 Kg. Not bad for a bike frame from around 1980.