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Trek 3900 3 Series Sport Level Mountain Bike 18"/46cm black - SHIW | Used Bikes for Sale - Silicon Valley Bicycle Exchange - Bay Area
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Trek 3900 Mountain Bike
Trek 3900 3 Series Mountain Bike for sale online | eBay
2008 Trek 3900 WSD – Specs, Comparisons, Reviews – 99 Spokes
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Trek 3900 XC Hardtail user reviews : 3.9 out of 5 - 48 reviews - mtbr.com
Trek 3900. Seller asking $125. Good deal? Don't know a whole lot about bikes. Needing to get one. : r/whichbike
13" Trek 3900 MTB - River Bicycles
Trek 3900 Disc - North Rim Adventure Sports Chico Ca
2007 Trek 3900 – Specs, Comparisons, Reviews – 99 Spokes
Trek 3900 Mountain Bike 13" Frame ~ Front Suspension ~ 24 Speed ~ Clean/Nice! | SidelineSwap
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Trek 3900. Seller asking $125. Good deal? Don't know a whole lot about bikes. Needing to get one. : r/whichbike
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2012 Trek 3900 Disc – Specs, Comparisons, Reviews – 99 Spokes
BikePedia - Bicycle Value Guide
Examining the Trek 3900: Is This Bike Worth Buying? | Bike, Trek, Bike frame
