The Trek Marlin 4 is the gateway mountain bike that will take you from rail trails to singletrack. It's ideal for riders who want a mountain bike with knobby tyres that can double as a rugged commuter. Disc brakes, front suspension, Shimano 14-speed shifting and mounts for a rack and mudguards make this a great bike for trail riders and campus commuters alike.

The Marlin Gen 2 is ready to roll with easy to use features that help you get the best bang for your buck
Rack and mudguard mounts make it easy to accessorise, 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 Trek, it's backed by a lifetime warranty

Sunset Cycles offers the 2025 Trek Marlin 4 Gen 2 hardtail bike in Matte Hex Blue finish with free delivery.

The 2025 Trek MARLIN (GEN 2) range: Marlin 4 (Black) | Marlin 4 (Blue) | Marlin 4 (Crimson)

Full Specification: Trek Marlin 4 Gen 2 (Blue) 2025 Hardtail Bike

Frame & Fork
Frame	Size: XS , S Alpha Silver Aluminium, curved top tube, internal routing, chainstay disc brake mount, rack and kickstand mount, 135x5 mm QR Size: M , ML , L , XL , XXL Alpha Silver Aluminium, internal routing, chainstay disc-brake mount, rack and kickstand mount, 135x5 mm QR
Fork	Size: XS SR Suntour XCE 28, coil spring, preload, 42 mm offset for 27.5" wheel, 100 mm QR, 80 mm travel Size: S SR Suntour XCE 28, coil spring, preload, 42 mm offset for 27.5" wheel, 100 mm QR, 100 mm travel Size: M , ML , L , XL , XXL SR Suntour XCE 28, coil spring, preload, 46 mm offset for 29" wheel, 100 mm QR, 100 mm travel
Wheels & Tyres
Hub front	Formula DC-20, alloy, 6-bolt, 5x100 mm QR
Hub rear	Formula DC-31, alloy, 6-bolt, 6/7/8-speed freewheel, 135x5 mm QR
Rim	Bontrager Connection, double-wall, 32-hole, 20 mm width, Schrader valve
Spokes	14 g stainless steel, black
Tyre	Size: XS , S Bontrager XR2 Comp, wire bead, 30 tpi, 27.5x2.20" Size: M , ML , L , XL , XXL Bontrager XR2 Comp, wire bead, 30 tpi, 29x2.20"
Drivetrain
Shifter	Size: XS , S , M , ML , L , XL , XXL Shimano EF500, 2-speed Size: XS , S , M , ML , L , XL , XXL Shimano Altus EF500, 7-speed
Front derailleur	Shimano Altus M315, 34.9 mm clamp, top swing, dual pull
Rear derailleur	Shimano Tourney TY300
Crank	Size: XS , S , M ProWheel TM-CY10, 36/22, 170 mm length Size: ML , L , XL , XXL ProWheel TM-CY10, 36/22, 175 mm length
Bottom bracket	VP BC73, 73 mm, threaded cartridge
Cassette	Shimano TZ500, 14-34, 7-speed
Chain	KMC Z7, 7-speed
Pedal	VP-536 nylon platform
Components
Saddle	Bontrager Verse Short, stainless steel rails
Seatpost	Size: XS , S Bontrager alloy, 31.6 mm, 12 mm offset, 330 mm length Size: M Bontrager alloy, 31.6 mm, 12 mm offset, 360 mm length Size: ML , L , XL , XXL Bontrager alloy, 31.6 mm, 12 mm offset, 400 mm length
Handlebar	Size: XS , S Bontrager alloy, 31.8 mm, 5 mm rise, 690 mm width Size: M , ML , L , XL , XXL Bontrager alloy, 31.8 mm, 15 mm rise, 750 mm width
Grips	Bontrager XR Endurance Comp, lock-on
Stem	Size: XS , S Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 50 mm length Size: M Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 60 mm length Size: ML , L Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 70 mm length Size: XL , XXL Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 80 mm length
Head set	Semi-integrated, 1-1/8"
Brake	Size: XS , S , M , ML , L , XL , XXL Tektro MD-M280 mechanical disc Size: XS , S , M , ML , L , XL , XXL Tektro MD-M281 mechanical disc Size: XS , S , M , ML , L , XL , XXL Tektro MD-M280 mechanical disc, 160 mm rotor Size: XS , S , M , ML , L , XL , XXL Tektro MD-M281 mechanical disc, 160 mm rotor
Brake rotor	Size: XS , S , M , ML , L , XL , XXL Tektro wave, 6-bolt, 160 mm Size: XS , S , M , ML , L , XL , XXL Tektro, 6-bolt, 160mm
Weight
Weight	M - 14.60 kg / 32.19 lb
Weight limit	This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).

Size Guide: Trek Marlin 4 Gen 2 (Blue) 2025 Hardtail Bike

Frame Size	Rider Height* (metric)	Rider Height* (imperial)
X Small	145 - 155 cm	4'9" - 5'1"
Small	155 - 165 cm	5'1" - 5'5"
Medium	165 - 173 cm	5'5" - 5'8"
Medium/Large	173 - 180 cm	5'8" - 5'11"
Large	180 - 188 cm	5'11" - 6'2"
X Large	188 - 195 cm	6'2" - 6'5"
XX Large	195 - 203 cm	6'5" - 6'8"
*This is for guidance only. You may be taller or shorter, it doesn't mean our bikes will not fit you. The best way to determine the correct bike size for you is to try one. Please contact us if you are in any doubt about the correct bike size for you.