The best replacement for trek 3900 is specialized hardrock.

The best alternatives to trek 3900 are rated as following:
★★★★★  specialized hardrock
★★★  merida matt 5
★★★  wahoo
★★★  cannondale trail 6
★★  cannondale trail 5
★  hardrock
★  giant rincon
★  giant revel 1
  gt avalanche
  revel 1

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trek 3900
specialized hardrock
merida matt 5