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Edward Dolan wrote:

It would never occur to me to try to keep up with those younger than
myself.
Unlike you, I gave up on riding hard and fast decades ago. If riding an
upright causes much back pain, I would recommend a recumbent bicycle. You
will be slower over all, but you will be more comfortable although you may
have to tweak the seat a bit. The best thing about cycling is what it does
for the mind, not the body.

The back and pelvic pain are due I believe to scar tissue in soft tissue
from radiation, not from riding on an upright and this is problematic on
either riding platform. As you will recall I have ridden both. Agreed
about cycling and the mind.

There is no comparison between “riding platforms”. I have had a low back
problem like forever (and later an upper back problem) which prevented me
from riding an upright, but recumbents work great no matter where your back
problem is located. I don’t recall your recumbent (Lightning P-38 ?), but I
would give it a try and see how it works for you. However, I do think most
back problems are caused by osteoarthritis (hard tissue, not soft tissue),
so indeed that may be different than damage caused by radiation.

How nice we have this newsgroup all to ourselves but others are welcome to
contribute if they can stand the heat. Newsgroups are not for sissies.

Ed Dolan the Great