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Trek Marlin 4 Gen 2

Trek Marlin 4 Gen 2
  • Color: Matte Trek Black
  • Color: Alpine Blue
  • Color: Voodoo Aloha Green
Size: Select size
Wheel Size: Select wheel size
Please select options Unavailable


Marlin 4 is the perfect gateway to trail riding. It's ideal for new riders who want a mountain bike with knobby tires that can double as a rugged commuter. Disc brakes, front suspension, 21 speeds, and mounts for a rack and fenders make this a great bike for new trail riders and campus commuters alike.

It's right for you if...
You want an introductory mountain bike at an incredible price but also want a commuter that's rugged enough to hop curbs on the way to class.

The tech you get
A lightweight aluminum frame with internal routing to protect your cables and add to the bike's sleek look, 21 speeds, a wide range of gearing so you always have the right gear for your terrain, powerful mechanical disc brakes, and a suspension fork that takes the edge off bumps and rough terrain.

The final word
Marlin is made for any adventure. The rack and fender mounts make it a great choice for commuters who want to get a little rad on the way to class or the grocery store.

Why you'll love it
- It's a real mountain bike that's also perfectly suited to daily commutes, rides around campus, or just getting from A to B on any surface
- Rack and fender mounts make it easy to accessorize, so your mountain bike can double as a rugged commuter
- Smaller frame sizes (XS and S) have short-reach brake levers that make it easier and more comfortable for riders with smaller hands to brake confidently
- Marlin models in XS and S frame sizes have a curved top tube and a lower standover height that makes it easier for smaller riders to mount and dismount
- Like every model in the Marlin family, it's backed by Trek's lifetime warranty

Wheel size:
- Sizes X-Small – Small: 27.5-inch
- Sizes Medium – XX-Large: 29-inch

Will my bike have a curved top tube?

Will my bike have a curved top tube?

Smaller frames (XXS-S) have a top tube that dips down as it approaches the seat tube. This design makes for a lower standover height, which is good for shorter riders because it allows them to straddle their bike more easily. The larger frames (M and up) have a straight top tube because taller riders with longer legs typically don’t have the same issues with standover height.


Frame Alpha Silver Aluminum, internal routing, chainstay disc brake mount, rack and kickstand mount, 135x5mm QR
Fork SR Suntour XCE 28, coil spring, preload, 42mm offset for 27.5" wheel, 46mm offset for 29" wheel, 100mm QR, 100mm travel (XS = 80mm travel)
Rims Bontrager Connection, double-wall, 32-hole, 20mm width, schrader valve
Hubs Front: Formula DC-20, alloy, 6-bolt, 5x100mm QR
Rear: Formula DC-31, alloy, 6-bolt, 6/7/8 speed freewheel, 135x5mm QR
Spokes 14g stainless steel
Tires XS, S = Bontrager XR2 Comp, wire bead, 30 tpi, 27.5 x 2.20"
M, ML, L, XL, XXL = Bontrager XR2 Comp, wire bead, 30 tpi, 29 x 2.20"
Bottom Bracket VP BC73, 73mm, threaded cartridge
Crankset Shimano Tourney TY301, 42/34/24, 175mm length (XS, S, M = 170mm length)
Shifters Shimano Altus EF500, 7-speed
Front Derailleur Shimano Tourney TY300, 34.9mm clamp, down swing, down pull
Rear Derailleur Shimano Tourney TY300, long cage, 34T max cog
Cassette/Freewheel Shimano TZ500, 14-28, 7-speed
Chain KMC Z7, 7-speed
Brakes Tektro MD-M280 mechanical disc, 160mm rotor
Handlebars Bontrager alloy, 31.8mm, 5mm rise, 720mm width (XS, S = 690mm width)
Tape/Grips Bontrager XR Endurance Comp, lock-on
Stem Bontrager alloy, 31.8mm, Blendr compatible, 7 degree
XS = 50mm; S = 60mm; M = 70mm; ML, L = 80mm; XL = 90mm
Headset Semi-integrated, 1-1/8"
Seatpost Bontrager alloy, 31.6mm, 12mm offset
Saddle Bontrager Arvada, steel rails, 138mm width
Pedals VP-536 nylon platform

* Subject to change without notice.

Part Numbers

Option UPC MPN Store SKU
Matte Trek Black / X-Small / 27.5-inch 601842527405 5255498 MAR26125639K
Matte Trek Black / Small / 27.5-inch 601842527399 5255499 MAR25627640K
Matte Trek Black / Medium / 29-inch 601842527382 5255500 MAR24279625K
Matte Trek Black / Medium/Large / 29-inch 601842527375 5255501 MAR2512776K
Matte Trek Black / Large / 29-inch 601842527368 5255502 MAR2472116K
Matte Trek Black / X-Large / 29-inch 601842527351 5255503 MAR25593368K
Matte Trek Black / XX-Large / 29-inch 601842527344 5255504 MAR26127683K
Voodoo Aloha Green / X-Small / 27.5-inch 601842527191 5255519 MAR28126084N
Alpine Blue / X-Small / 27.5-inch 601842863152 5275330 MAR22307195E
Voodoo Aloha Green / Small / 27.5-inch 601842527184 5255520 MAR27319555N
Alpine Blue / Small / 27.5-inch 601842863145 5275332 MAR21799977E
Voodoo Aloha Green / Medium / 29-inch 601842527177 5255521 MAR26143674N
Alpine Blue / Medium / 29-inch 601842863138 5275334 MAR20480592E
Voodoo Aloha Green / Medium/Large / 29-inch 601842527160 5255522 MAR27553429N
Alpine Blue / Medium/Large / 29-inch 601842863121 5275336 MAR21729682E
Alpine Blue / Large / 29-inch 601842863114 5275338 MAR20835838E
Alpine Blue / X-Large / 29-inch 601842863107 5275340 MAR21328134E
Alpine Blue / XX-Large / 29-inch 601842863091 5275342 MAR22395852E