More options
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. Disc brakes, knobby tires, and 21 speeds make Marlin 4 a great choice.
The tech you get
Marlin 4 has 21 speeds with a wide range of gearing for easy riding on varied terrain. It's modeled after our higher-end mountain bikes and built with a lightweight Alpha Aluminum frame, mechanical disc brakes for increased stopping power in any weather conditions, and a suspension fork with 75mm of travel—just enough to absorb the big bumps and keep you cruising.
The final word
Marlin 4's greatest gift is its versatility. It's built in Trek's mountain bike heritage and totally capable of taking on the trails. But it's an efficient daily rider, too. 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.
The Walkthrough
favorite_borderWhy 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
- The flat mountain-style handlebar and disc brakes keep you in control, on or off the trail
- Rack and fender mounts make it easy to accessorize, so your mountain bike can double as a rugged commuter
- Backed by Trek's limited lifetime warranty
Features
Alpha Silver Aluminum
Our proprietary lightweight aluminum is continuously cold extruded to a single wall thickness for durable performance.
Smart Wheel Size
The right wheel size paired with your frame size gives you the perfect combination of responsiveness and control.
Mechanical disc brakes
Reliable stopping power in all conditions, including wet and muddy.
Rack mounts
Going for a long ride? Rack mounts make carrying accessories a breeze.
Extended size range
A wider range of sizes than the industry standard provides more option for everyone, from tallest to shortest and all those in between. Because everyone deserves a great ride.
Specifications
*spec applies to all sizes unless otherwise noted
| Frame | Alpha Silver Aluminum, rack & fender mounts, 135x5mm QR |
|---|---|
| Fork | SR Suntour M-3030, coil spring, preload, 100mm QR, 75mm travel |
| Front Hub | Formula DC-20, alloy, 6-bolt, 5x100mm QR |
|---|---|
| Rear Hub | Formula DC-31, alloy, 6-bolt, 6/7/8 speed freewheel, 135x5mm QR |
| Rim | Bontrager Connection, double-wall, 32-hole, 20mm width, schrader valve |
| Spokes | 14g stainless steel |
| Tire | Bontrager XR2, 29x2.20'' front, 29x2.00'' rear (13.5 & 15.5'': 27.5x2.20'') |
| Shifter | Shimano Altus EF500, 7 speed |
|---|---|
| Front Derailleur | Shimano Tourney TY500, 34.9mm clamp, top swing, dual pull |
| Rear Derailleur | Shimano Tourney TY300, long cage, 34T max cog |
| Crank | Shimano Tourney TY301, 42/34/24, 170mm length |
| Bottom Bracket | VP BC73, 73mm, threaded cartridge |
| Cassette | Shimano TZ21 14-28, 7 speed |
| Chain | KMC Z51 |
| Pedal | Wellgo nylon platform |
| Saddle | Bontrager Evoke 1, steel rails |
|---|---|
| *Seatpost |
Size:
XS , S Bontrager alloy, 27.2mm, 12mm offset, 330mm length |
|
Size:
M , ML , L , XL , XXL Bontrager alloy, 27.2mm, 12mm offset, 400mm length |
|
|
Size:
M Bontrager alloy, 27.2mm, 12mm offset, 360mm length |
|
| Handlebar | Bontrager Riser, 25.4mm, 30mm rise, 620mm width |
| Grips | Bontrager Satellite Plus |
| *Stem |
Size:
XS , S Bontrager alloy, 25.4 mm clamp, 15-degree, 60 mm length |
|
Size:
M , ML , L , XL Bontrager alloy, 25.4mm clamp, 10 degree, 90mm length |
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Size:
XXL Bontrager alloy, 25.4mm clamp, 10 degree, 110mm length |
|
| Headset | Semi-integrated, 1-1/8'' |
| Brake | Tektro MD-M280 mechanical disc, 160mm rotor |
| Weight | M - 14.10 kg / 31.08 lbs (with tubes) |
|---|---|
| Weight limit | This bike has a maximum total weight limit (combined weight of bicycle, rider, and cargo) of 300 pounds (136 kg). |
Sizing & fit
Proper bike fit is essential for best performance and comfort. Any size and geometry measurements shown on trekbikes.com are for general comparison purposes only. To find your perfect fit, visit an authorized Trek retailer, where an expert skilled at sizing will help you find the appropriate bike and size for your individual needs.
Rider Height
Inseam
XS
137.0 - 155.0 cm
4'5.9" - 5'1.0"
64.0 - 73.0 cm
25.2" - 28.7"
S
153.0 - 162.0 cm
5'0.2" - 5'3.8"
72.0 - 76.0 cm
28.3" - 29.9"
M
161.0 - 172.0 cm
5'3.4" - 5'7.7"
76.0 - 81.0 cm
29.9" - 31.9"
M/L
170.0 - 179.0 cm
5'6.9" - 5'10.5"
80.0 - 84.0 cm
31.5" - 33.1"
L
177.0 - 188.0 cm
5'9.7" - 6'2.0"
83.0 - 88.0 cm
32.7" - 34.6"
XL
186.0 - 196.0 cm
6'1.2" - 6'5.2"
87.0 - 92.0 cm
34.3" - 36.2"
2XL
195.0 - 203.0 cm
6'4.8" - 6'7.9"
92.0 - 95.0 cm
36.2" - 37.4"
All measurements provided in cm unless otherwise stated.
| Frame size number | Frame size letter | Wheel size | A — Seat tube | B — Seat tube angle | C — Head tube length | D — Head angle | E — Effective top tube | F — Bottom bracket height | G — Bottom bracket drop | H — Chainstay length | I — Offset | J — Trail | K — Wheelbase | L — Standover | M — Frame reach | N — Frame stack |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 13.5 in | XS | 27.5" | 34.3 | 73.5° | 9.0 | 69.5° | 54.3 | 29.2 | 5.8 | 43.8 | 4.4 | 8.5 | 104.9 | 70.5 | 37.6 | 56.5 |
| 15.5 in | S | 27.5" | 36.8 | 73.5° | 9.0 | 69.5° | 55.5 | 30.2 | 4.8 | 43.8 | 4.4 | 8.5 | 106.6 | 72.8 | 38.5 | 57.4 |
| 17.5 in | M | 29" | 41.9 | 73.5° | 9.0 | 69.5° | 59.5 | 31.1 | 5.8 | 43.8 | 5.1 | 8.3 | 110.9 | 74.3 | 41.8 | 59.8 |
| 18.5 in | ML | 29" | 44.4 | 73.5° | 9.0 | 69.5° | 61.1 | 31.1 | 5.8 | 43.8 | 5.1 | 8.3 | 112.5 | 75.0 | 43.4 | 59.8 |
| 19.5 in | L | 29" | 47.0 | 73.5° | 10.0 | 69.5° | 63.1 | 31.1 | 5.8 | 43.8 | 5.1 | 8.3 | 114.5 | 74.7 | 45.1 | 60.8 |
| 21.5 in | XL | 29" | 52.1 | 73.5° | 12.0 | 69.5° | 65.2 | 31.1 | 5.8 | 43.8 | 5.1 | 8.3 | 116.7 | 75.0 | 46.6 | 62.6 |
| 23 in | XXL | 29" | 55.9 | 73.5° | 13.5 | 69.5° | 67.0 | 31.1 | 5.8 | 43.8 | 5.1 | 8.3 | 118.6 | 78.3 | 48.0 | 64.1 |