William, use the max pressure your tire is rated for. The ride will stiffen, but the side walls will not squirm which generates heat softening the inner tube causing tube failure. That is why tubeless tires are so reliable. Your chain stretch can be as you suggest drawing the axle back. At some point you will have to remove a chain link. Even the best chain will stretch.I've gotten two flats in three days am I putting too much air? it's always the back tire too.....it's says 40 psi but considering these raggedy ass streets in Chicago maybe I should put less ..first flat there wasn't any holes but this time it did puncture .....starting to wonder if I just can't ride a motorized bike with so many messed streets
It's called " Ride and Wrench".
" These raggedy ass streets in Chicago"
I know them well.
Except the Magnificent Mile and towards the Lake.
The streets get little love.
Tom from Rubicon,WI