Originally Posted by stapfam

warning!!!!

The bike shop have told you that the chain is .75% worn. You should change it when or before it gets to 1%. Problem is-- that the chainrings and cassette may be more worn that the chain. All that will happen if you fit a new chain to worn cassette and chainrings- Is that you will start skipping teeth on the gears and it will be very awkward to ride. Infact- it could be impossible.

And if you are heavy- go to a 1.5 tyre as it would not require as much pressure as a skinny one and would give a cushier ride..