Rear sprocket size

My bike weighs about 80 Lbs im also a "fatster" at 215 Lbs, myself with three different heart conditions and a "gimpy" right leg as well as asthma, copd, you get the picture, im a wreck at 65...lol...by pedaling the little i have to, the docs no longer hear strange noises in my heart any longer, my lungs sound much clearer, and i no longer have to use my cane that i have had to use off and on for ten yrs...Not overdoing it but moderate exercise like this, despite Drs. orders have improved my overall health immensely...My Dr. has revised his orders/advice...at least in my case...lol...lol...DAMIEN
 
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