My brother has his heart set on a Trek 4300 with disc breaks. His high school graduation is next week and this will be his present from my parents. I'd like to pick it up as soon as possible and have it waiting for him when he gets home from work. What is the best frame size to get for him? He's 5'6 3/4 and weighs 125 pounds. The bike is available in 16" and 18". Is it better to go bigger or small or is it all preference? The bike can be found here:
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Need help with frame size??