Hello, I have a few questions about bicycles and I know it must get old responding to these but I'm totally lost. I consider myself an outdoor enthusiast I try to get a toe into every sport. Basically if there is something to do I want to be there or atleast try it. My wife and I are avid backpackers/minimalistic campers as a primary hobby but now that we have a little one it maybe 3 years or even more till were back at it.
I'm 6'1" 278 lbs but i'll drop back down to 240 probably in a few months. I never want to weigh less than 230. I became a father this Jan and for the last 9months I went from an extremely active strength training lifestyle to baby proofing house and eating icecream with pregnant mommy. I have a mountain bike and it is a cheapy but I destroyed the wheels mountain biking with a few friends this week. I had to carry it on my shoulders for 3 miles to get back to the car. Yet I had great time, and it made me think that bicycling at least to work everyday would be a great hobby till the baby is older.
So now to the questions, If I destroyed a MTB at my weight on the trail then should I even worry about getting another bike till I lose the 38lbs? What kind of bike do I need, if i want to use it to commute 15miles one way everyday? Will this bike be durable enough for me to take a turn to fast and eat gravel without destroying the bike? Can this bike be used in duathlon, I would be happy just to complete(I only run 5k&10k but maybe someday)? Is that asking to much for one bike? I will buy another mtb later I just want an activity I can do daily, trails are too far away for me. Also I really don't want to spend more than $500 until I do it for atleast a year.