Hi all I changed my chain ring to a 38 T on my rail 7 and up graded the chain the rubber o ring had split but not really needed , you must use lock tight on the spider nut
Never had any problem since, I always check
Before I ride
I am 65 and ride 32 km every second day I have a complete new left knee and have never had a problem with it, my suggestion is do the rehab they tell you to and it will be fine I can bend my knee over 110 deg I wasn’t allowed to leave hospital until I could bend it to 90 deg this took 5days...