@brian5837
This information I am posting comes from my PCP, R/O at UFHPTI, and Mayo R/O.

When I was doing my PSA (every 3 months because of rising numbers) my PCP wanted me to stop bike riding a week prior to PSA test. I was doing 20-25 miles. This was because PCP stated bike riding can irritate the prostate. You will see some give statistics but everyone's body is different and the amount of irritation from the bike riding will be different for each person.

When I did my original counsulation at Mayo my R/Os went over my treatment plan. Part of that was giving me do's and dont's. It included to stop bike riding prior to Markers and Space/Oar being put in. Why irritation. Then no bike riding during treatments. Why? The amount of pressure put on prostate area can affect and even move the Space/Oar. Then when finished no riding until a month later to let prostate settle down.

I then had my second opinion done at UFHPTI. I go the same do's and don'ts. I was surprised at this one they even limited vitamins and supplements (I can do into why if you want). UFHPTI also said no bike riding prior, during, and right after. Same reason seat and pressure can put pressure on prosate irritating it even further but main issue is possiblity of moving the Space/Oar.

I don't want to give you medical advice but you asked about using a exercise bike after you finished a month ago. I was told to not bike ride for a month after and you are beyond a month now. But I would check for sure with your R/O. I see you use a exercise bike. What my R/O at UFHPTI said to me that these types of bikes with wide seats are much better as distribute the weight across a wider area that race bike seats.

I hope I answered your question. I loved to bike ride but like I said it was the only activity that I was asked to not do prior, during and right after.