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Today’s Deals2026 Trek
Marlin 4 Gen 3
A 26″ / 27.5″ / 29″ aluminum frame hardtail crosscountry bike with mid-range components.
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Manufacturer Price
$629| Weight | 32.8 lbs |
|---|---|
| Frame | Aluminum |
| Suspension | Hardtail, 100mm |
| Fork | Suntour XCM |
| Wheels | 26″ / 27.5″ / 29″ Aluminum |
| Drivetrain | 1 × 8 |
| Groupset | Essa |
| Brakes | Tektro Hydraulic Disc |
Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more.
Compare the full Marlin model range
View Comparison4'8" – 5'2"
5'0" – 5'6"
5'4" – 5'10"
5'8" – 5'11"
5'9" – 6'3"
6'1" – 6'6"
6'4" – 6'8"
None yet.
Do you have this bike? Help other riders make a decision about which size will work for them by sharing your own size and fit notes.
Jul 2025
A 27.5″ / 29″ aluminum frame hardtail crosscountry bike with mid-range components.
Modern XC geometry
Clean aesthetics and internal cable routing
Shimano CUES drivetrain democratizes great shifting
Straight headtube, QR front hub, and “Thru-Skew” axle in the rear limit future upgrades
Wheels are not tubeless compatible
Heavy, poor performing 80 mm travel fork
Apr 2024 · James Huang
Trek’s entry-level aluminum hardtail mountain bike.
Fantastic frame geometry
Excellent shifting
Good tires
Looks great
Generous tire clearance
Easy-to-live-with semi-internal routing
Sort of a rear thru-axle.
Mega-heavy fork with minimal adjustability
Tubeless costs extra
Limited upgrade potential.
May 2023 · Andrew McLemore
Riders can expect updated geometry, a new frame, increased tire clearance and a rear axle system that "enhances stability," Trek said.
Feb 2023 · Oscar Huckle
Can the Marlin compete with the bigger players?
Lots of frame sizes
Excellent tyre choice
Dropper seatpost
Upgrade potential
Roomier seated position would be preferred
Quick-release rather than thru-axle
Rattly internal cable routing
| Frame | Frameset Marlin, Alpha Silver Aluminum, curved top tube, internal derailleur & dropper post routing, rack and kickstand mount, 135x5mm ThruSkew - XXS , XS : Alpha Silver Aluminum, curved top tube, internal derailleur & dropper post routing, rack and kickstand mount, 135x5mm ThruSkew; S , M , ML , L , XL : Alpha Silver Aluminum, internal derailleur & dropper post routing, rack and kickstand mount, 135x5mm ThruSkew BB Standard: BSA, 73mm, Threaded Tire Clearance: 2.4" Colors: Matte Dark Web; Purple Flip / Black Fade; Blue Sage |
|---|---|
| Fork | SR Suntour XCM 30, coil spring, preload, hydraulic lockout, for 26'' wheel, 100mm QR, 100mm travel - XXS : SR Suntour XCM 30, coil spring, preload, hydraulic lockout, 42mm offset for 26'' wheel, 100mm QR, 100mm travel; XS : SR Suntour XCE 28, coil spring, preload, 42mm offset for 27.5'' wheel, 100mm QR, 80mm travel; S : SR Suntour XCE 28, coil spring, preload, 42mm offset for 27.5'' wheel, 100mm QR, 100mm travel; M , ML , L , XL : SR Suntour XCE 28, coil spring, preload, 46mm offset for 29'' wheel, 100mm QR, 100mm travel Travel: 100mm Spring Type: Coil |
| Bottom Bracket | Threaded cartridge |
| Headset | Semi-integrated, 1-1/8'' |
| Stem | Bontrager alloy, 31.8mm, Blendr compatible, 7 degree, 35mm length - XXS , XS , S : Bontrager Comp, 31.8mm, 7 degree, 35mm length; M , ML , L : Bontrager Comp, 31.8mm, Blendr compatible, 7 degree, 50mm length; XL : Bontrager Comp, 31.8mm, Blendr compatible, 7 degree, 60mm length |
| Handlebar | Bontrager Approved Lowriser, 31.8x690mm, 5mm Rise, 9D Bend/4D Upsweep, Black - XXS , XS : Bontrager alloy, 31.8mm, 5mm rise, 690mm width; S : Bontrager alloy, 31.8mm, 15mm rise, 720mm width; M , ML , L , XL : Bontrager alloy, 31.8mm, 15mm rise, 750mm width |
| Saddle | Bontrager Verse Short, stainless steel rails |
| Seatpost | Bontrager alloy, 31.6mm, 12mm offset, 300mm length - XXS : Bontrager alloy, 31.6mm, 12mm offset, 300mm length; XS , S , M : Bontrager alloy, 31.6mm, 12mm offset, 330mm length; ML , L , XL : Bontrager alloy, 31.6mm, 12mm offset, 400mm length Type: Rigid |
| Pedals | nylon platform |
| Grips | Trek Line Comp, nylon lock-on |
| Rear Derailleur | Shimano ESSA U2000 |
|---|---|
| Crank | ProWheel alloy, 30T narrow-wide steel ring, 160mm length, square taper, 52mm chainline - XXS , XS : ProWheel alloy, 30T narrow-wide steel ring, 160mm length; S , M , ML : ProWheel alloy, 30T narrow-wide steel ring, 170mm length; L , XL : ProWheel alloy, 30T narrow-wide steel ring, 175mm length |
| Shifters | Shimano M315, 8 speed |
| Cassette | Shimano HG300, 11-45, 8 speed |
| Chain | KMC Z8.3, 8 speed |
| Brakes | Tektro HD-M276 hydraulic disc - XXS , XS , S : Tektro HD-M276 hydraulic disc; XXS , XS , S , M , ML , L , XL : Power BH-M286TF hydraulic disc, 160mm rotor; M , ML , L , XL : Tektro HD-M275 hydraulic disc; M , ML , L , XL : Power BH-M286TF hydraulic disc, 180mm rotor Type: Tektro Hydraulic Disc |
| Rims | Bontrager Connection, double-wall, 32-hole, 20mm width, schrader valve |
|---|---|
| Front Hub | Formula DC-20, alloy, 6-bolt, 100x5mm |
| Rear Hub | Formula DC-22, alloy, 6-bolt, Shimano 8/9/10 freehub, 135x5mm |
| Tires | undefined - XXS : Bontrager Montrose Comp, wire bead, 30 tpi, 26x2.35''; XS , S : Bontrager Montrose Comp, wire bead, 30 tpi, 27.5x2.4''; M , ML , L , XL : Bontrager Montrose Comp, wire bead, 30 tpi, 29x2.4'' |
| Disc Rotors | Tektro TR160-52, 6-bolt, 160mm - XXS , XS , S , M , ML , L , XL : Tektro, 6-bolt, 160mm; M , ML , L , XL : Tektro, 6-bolt, 180mm |
First added July 5
Last updated June 7