Lots of good info and input. Firstly, I did and have been losing the weight very slowly. I've been riding for about 6 years so I think I'm pretty good at riding smart...drafting, hills, etc. I am a little better on the hills but still get dropped. It just seems that when they pour on the power for any extended length of time on the flats I just can't hang on. I run on Mon/Wed, swim and do group bike rides on Tue/Thur, rest on Fri. and then Sat./Sun do a semi-long run and a semi-long bike. So no, I don't really do bike specific training...just hard group rides. But I do try to do hill or interval work and tempo training on my runs.

I'm going to have to pay more attention to if it's cardiovascular or legs. But as of right now I'm thinking CV. A few years back I had a lung function test done because of some other concerns (nodule in lung...benign) and they said I was borderline COPD and/or that I "might" have exercise induced asthma. I'm thinking maybe this is my limiting factor and that maybe I should address this again with my GP on my next visit that's coming up in a month.

It's just really frustrating to have worked so hard to lose weight and it not paying off as much as I thought it would...