![Trek 3900 3 Series Sport Level Mountain Bike 18"/46cm black - SHIW | Used Bikes for Sale - Silicon Valley Bicycle Exchange - Bay Area Trek 3900 3 Series Sport Level Mountain Bike 18"/46cm black - SHIW | Used Bikes for Sale - Silicon Valley Bicycle Exchange - Bay Area](https://130002567.cdn6.editmysite.com/uploads/1/3/0/0/130002567/s518234545767551931_p1457_i1_w2048.jpeg)
Trek 3900 3 Series Sport Level Mountain Bike 18"/46cm black - SHIW | Used Bikes for Sale - Silicon Valley Bicycle Exchange - Bay Area
![Trek 3900 Alpha Mountain Bike - custom aluminum, 18" or 46cm size, new comfy seat for Sale in Seattle, WA - OfferUp Trek 3900 Alpha Mountain Bike - custom aluminum, 18" or 46cm size, new comfy seat for Sale in Seattle, WA - OfferUp](https://images.offerup.com/ccYJHQY7MQF0sA04iihFfQrGUxo=/333x250/6448/64481306132f4d299d78f1766adf9a1e.jpg)
Trek 3900 Alpha Mountain Bike - custom aluminum, 18" or 46cm size, new comfy seat for Sale in Seattle, WA - OfferUp
![Used (normal wear), - Trek 3900 Mountain Bike (Alpha Custom Aluminum) for Sale in Los Angeles, CA - OfferUp Used (normal wear), - Trek 3900 Mountain Bike (Alpha Custom Aluminum) for Sale in Los Angeles, CA - OfferUp](https://images.offerup.com/QMnvV6AXaeNQlkU-soUF_g7VubA=/1920x1920/e422/e4225c6ae2934837bcf40a8bab031876.jpg)
Used (normal wear), - Trek 3900 Mountain Bike (Alpha Custom Aluminum) for Sale in Los Angeles, CA - OfferUp
Scheller's - Refurbished Used Trek 3900 Ladies Low Step Green - Scheller's Fitness & Cycling Louisville, Lexington, Clarksville
![Trek 3900( Alpha Custom Aluminum ) Mountain Bike, 24Speeds. Size : 49.5cm Good Condition. for Sale in Plantation, FL - OfferUp Trek 3900( Alpha Custom Aluminum ) Mountain Bike, 24Speeds. Size : 49.5cm Good Condition. for Sale in Plantation, FL - OfferUp](https://images.offerup.com/zxbXXprLVZkkm5Uwww3qHE6Pp9Y=/756x1008/29b2/29b27fffecda4f789b37701be682b403.jpg)
Trek 3900( Alpha Custom Aluminum ) Mountain Bike, 24Speeds. Size : 49.5cm Good Condition. for Sale in Plantation, FL - OfferUp
![Trek 3900. Seller asking $125. Good deal? Don't know a whole lot about bikes. Needing to get one. : r/whichbike Trek 3900. Seller asking $125. Good deal? Don't know a whole lot about bikes. Needing to get one. : r/whichbike](https://preview.redd.it/trek-3900-seller-asking-125-good-deal-dont-know-a-whole-lot-v0-b59pruht5o891.jpg?width=640&crop=smart&auto=webp&s=148baca2e451179bc06c36530a4460e10ec46e2e)