Good luck with the C25K fella, just really dial the pace back as much as you can. Your cycling mechanics are quite different from running and although your engine is no doubt great it’s about building strength for a different activity. I see so many new runners who see great gains in speed and then keep the hammer down, injury is inevitable.
Just build miles, really easy miles, lots of miles before loading the body fully. A few strides at the end of your runs when warm will get the body use to leg speed and what it feels like.
I run with some exceptional cyclists who migrate between the two sports extremely well and I threaten every year that I will kick the cycling off but just manage a few rides. They all take the p!as about the work of art hanging on my garage wall constantly, I might shock them this year. LOL.
Enjoy
Pitch