getaclueblue: A little off subject but I’ll throw it out there anyway. Got home today and was going to ride. Front tire was 80# so I added up to 105#. Went to add air to the back tire and it was flat. Question 1; Why is it the back tire 90% of the time? And thats how it always been since I’ve been riding.Added 60# of air to back tire, no leaks. Increased air press to 110#, again no leaks. No one has let the air out of the back tire since I last rode so I know that’s not the reason.Question 2: Has anyone experienced this mistery flat phenomenon and if so, did you solve the mistery?I left the 110# in there and will ride my other bike. All I know to do is see if it goes flat again anytime soon.Your input is greatly appreciated.

To try and answer your questions:

1. Rear tires have more of your weight over them; thus, wear faster making them more prone to punctures / flats / slow leaks. Because of this some recommend rotating tires, others say no, keep the best tire on the front. Personally, I rotate ’em, but not to the point where the front is threadbare!
2. Bike tires lose air pressure. All do, some faster than others. However, to lose 25# in a day or two is unusual. I’d think a slow leak somewhere. If it’s over a week or longer, then maybe normal. For the rear tire to be flat, definitely a slow leak. Even sitting over a winter, a tire should not be completely flat. I’d suggest removing the tube, inflating it, putting it in soapy water to see if you can spot it. Also, inspect the inside of the tire for debris that may be causing the puncture. A fine cloth (silk) can be used to snag on things that even your fingers won’t find.
Good Luck!