I based that comment on "easily" flexing our 1989/90 Santana Rio, 140mm spaced, to accommodate a modern 145mm rear wheel. Was easy to do by hand.
Originally Posted by
conspiratemus1
Don't be so sure about "easily" flexing out the rear end on a Santana tandem. Our 1989 Targa has very stiff chainstays made from Columbus fork blades that our frame artisan was unable to budge even with his muscular assistant wielding the tools in his torture chamber. A few years later we had a new brake bridge brazed in so as to mount caliper brakes. With both the brake bridge and the chain stay bridge cut out he was able to spread the dropouts 10 millimetres but he sweated hard with it. Said it was the toughest cold set he'd ever done.