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Trek 3900 XC Hardtail user reviews : 3.9 out of 5 - 48 reviews - mtbr.com
Trek 3900 Mountain Bike
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16" Trek 3900 (929D G4L)
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16" TREK 3900 Aluminum Step-Thru Utility Bike ~5'3"-5'6"
Trek 3900 Disc reviews and prices - Hardtail bikes
