19.5" TREK 3900 Alpha Aluminum 21 Speed Hardtail Mountain Bike 5'9"-6'0"
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Trek 3900 Mountain Bike
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2010 3900 Disc - Bike Archive - Trek Bicycle
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![Is Trek 3900 Mountain Bike A Good Bike? [Trek 3900 Review]](https://bestbikeselect.com/wp-content/uploads/2021/12/Trek-3900-2.jpg "Is Trek 3900 Mountain Bike A Good Bike? [Trek 3900 Review]")
Is Trek 3900 Mountain Bike A Good Bike? [Trek 3900 Review]
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