I'm confused. I thought you said that you two bought a bike... for you? You went cycling together... so I thought that meant you have a bike too?
I think we all know that our body tells what is good and what is too much. Honestly, I don't know if anyone can tell you if that is too much or not.
Really, the only thing I would warn you against, would be mashing on the pedals and not spinning. I think runners turned cyclists, have a tendency to think they have to muscle through the stroke, not realizing that it doesn't take that much muscle to turn the pedals fast... if you know how to use your gears properly.
Now, I never ran as much as you... but I never had any knee issues, until I started riding a bike... because my fit wasn't good at first (my cleats were locked into the wrong position on my clipless pedals), and I was mashing the pedals.
Good luck and it is important that you ride a bike fitted for you.



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I have always wanted to do a triathalon but worried about the biking part. I am a decent swimmer and runner but never biked. I am still getting comfortable riding in the road, changing gears, and paying attention. It is certainly something I will do in the future now that my "fear" of bikes is over. Thanks for the advice everyone. I am going to try to do 90 miles this week and just increase it slightly every week. I should be better at listening to my body now than I was when I started running.
My boyfriend was on the guide's turf and respected that (and so did I!!!).