..... On the saddle post! I've guestimated my mileage since I sarted commutycling at around 2500 - 3000. But in all that time, I've never made any adjustment to the saddle or handlebar height. That was until this-morning. Somewhere on here, I got the idea that a higher saddle might make a difference, so I raised it by a couple of inches to test it out. Apart from misjudging the attempt of getting on the bike I was amazed at the difference it made. My knees (always a troublesome part of my body) felt a lot happier at not having to go as high as before and when tackling the two hills on the way home, I had no need to stand up to generate the power needed I think I will lower it by a quarter or half an inch, but why oh why didn't I do this before?