>> That's a myth, Brompt.
Interesting point, I'm not so sure.
I bought a 5 speed "racing" bike in 1977. Came with a rack and I fitted proper Bluemels mudguards. Chainwheel (steel, cotter pinned) was about 52 teeth. Replaced Huret changer with a Suntour Cyclone and mucked around with the block but probably only managed low twenties for largest cog. Used it as a tourer.
Did the London Brighton in May 1981 and a few other tours. Returning from the second of those i was painfully aware of my left knee (I cannot manage the UK kerbside foot down thing) at every traffic light etc.
By early June I could barely walk.
Lowered the gearing and went to 10 speeds in 82 but even then I had issues. Returning from a now closed Youth Hostel near Faringdon (Oxon) c April 83 with a lass who I still regret not dating I was in agony from Beaconsfield back to Harrow.
I still think pushing too hard on 50"+ gears knackered my cartilages.
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Dynamic hip screw new
Dynamic hip screw new