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