I have had my mother complain to me that she is finding she is having difficulty riding her bike. Now, apart from firness, I tried to see if I could see what is wrong by riding it myself.
I have come to the conclusion that her wheel doesn't spin very freely.
Mine, I put in minimal force to spin the wheel by hand and both the back and front wheel spin for an age. Also, my back wheel doesn't "tick" so loud when it's spinning.
Her's only spin for a while before stopping. She also has a much louder "ticking" on her back wheel when it's spun.
Finally, I have checked, and no brakes are rubbing at all when slack.
I don't know much about bikes, so any help would be much appreciated.