Quote Originally Posted by Muirenn View Post
Your knees hurt? The saddle position needs to be adjusted. Can you go to a local bike shop and ask them to help you adjust the saddle so your knees don't hurt? A full bike fitting is unusual on that type of bike, but it sounds like you would benefit.
What we mean by the saddle position is the height. As you pedal when your feet are in the 12 o'clock and 6 o'clock position your lower leg (6 o'clock) should be straight but the knees are not locked. Your knee will have an ever so slight bend.

This is also with the ball of the foot on the pedals, not the heel of the foot.

What I see often especially new or returning riders is the seat is too low. This makes you feel more comfortable on starts and stops. And if you need that now that is fine!

But this lower position increases strain on the knees. It sounds like you are doing more miles now.

So I'd either take it to a shop and have them asses the fit.