Nah, it doesn't require a steel bike.
I started riding my Specialized Globe Carmel, which is kind of a hybrid between a mountain bike and a cruiser (has an aluminum frame), weighing more than you weigh now. I didn't have to change any of the standard components, though I chose to go with a Brooks B66s saddle. I ride exclusively on trails and I love my bike.
If you go with a Trek you will need to change the seat. Their stock saddles are very uncomfortable (my daughter has a Trek Navigator and she has a Brooks Flyer saddle).



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