2024 Trek Marlin 4 Gen 2 Hardtail Mountain Bike


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The 2024 Trek Marlin 4 Gen 2 Hardtail Mountain Bike is the gateway mountain bike to help you get riding off-road. 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 commuters alike.

The Marlin 4 is built around a lightweight Alpha Silver Aluminium frame with internal routing to protect your cables and add to the bike's sleek look. The XSmall and Small size bikes come with 27.5" wheels and a curved top tube while larger sizes come with 29" wheels and a straight top tube. This makes it easier to get on and off the bike, and improves control, for smaller riders.

The Marlin 4 comes with trustworthy 14-speed Shimano shifting with 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.

This bike is perfect for

Riders who want an introductory mountain bike at an incredible price, but also want a commuter that's rugged enough to hop kerbs and deal with potholes.

Key Features
  • The Marlin Gen 2 gives you all-around versatility with fast-rolling tyres and balanced, neutral geometry that keeps you comfortable and in control off-road. No wonder it’s our best-selling mountain bike ever.
  • 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

Mountain Bike Buying Guide

Mountain biking is an incredibly diverse sport. Mountain bikes now come in three main flavours. They are XC, Trail and Enduro.

XC – short for cross country, are quick race bikes. They will normally have 29” wheels and come with 100mm of suspension. If you are mainly going to be riding bridleways and natural trails in the South East of England, where our shops are, an XC bike will be the quickest and most efficient option.

Trail – these bikes are designed to be pedalled up and down hill and for use on bridleways and natural trails, but also at dedicated trail centres. They normally come with 130mm or 140mm of suspension travel and can have either 27.5” or 29” wheels, but 29” is quickly becoming the norm. Trail bikes are good all-rounders. They won’t be as fast as an XC bike on the flat but they can handle a lot more challenging terrain, and a few jumps. If you plan on taking your bike to trail centres in Wales, or to the Alps, then a trail bike may be your best option.

Enduro – enduro racing is a thing in and of itself but many people buy enduro bikes for ‘aggressive’ trail riding and uplift days at places like Bike Park Wales. This generally means challenging downhill trails with some big jumps. With around 160mm of suspension travel enduro bikes can take some big hits. They are designed to be efficient enough to pedal up hills but really come into their own when pointed downhill. You get enduro bikes in either 27.5” or 29” wheel sizes as well as mullet setups of 29 at the front and 27.5 at the back.

Men’s and women’s mountain bikes

Nearly all the mountain bikes we sell are now unisex. All of the big brands have gradually stopped doing dedicated men’s and women’s bikes over the last few years. Instead they are focussed on producing bikes in a bigger range of sizes. So, for instance, the Trek Marlin 5 is a unisex bike that now comes in sizes from XXS to XXL large. This means it will fit riders from 4’ 5” to 6’ 5” and everything in between.

Read our full mountain bike buyers guide

Price Match at Cycles uk

We understand that price is important, so we regularly price-check our competitors to make sure we have the best offers available. We recognise that we will not always be the cheapest, so if you see the same product cheaper from any of our competitors then please get in touch via the form below and we will do our best to match any reasonable advertised price.

Trek made their first bikes in 1976 in a barn in Wisconsin. Now they’re one of the biggest bike brands in the world. Trek bikes cover everything from professional-level road and mountain bike race bikes to commuters, hybrids and kids bikes. There is a strong heritage of racing at Trek and many Trek bikes have a strong race influence. They take a very scientific approach to researching bike and human performance and then make the fastest and most efficient bikes they can.

It doesn’t stop their attention and passion for cycling flows through everything they do. Since the 1990s, Trek has supported Places for Bikes. Places for Bikes is an advocacy organisation in the USA that gets more people on bikes more often! Places for Bikes ethos falls in line with the companies mission statement to:

Build only products we love. Provide incredible hospitality to our customers, and change the world by getting more people on bikes.

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, straight top tube, 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

Skewer rear = 152x5 mm QR

Shifter - Shimano EF500, 2-speed and Shimano Altus EF500, 7-speed

Front derailleur - Shimano Altus M315, 34.9 mm clamp, top swing, dual pull

Rear derailleur - Shimano Tourney TY300

Crank - ProWheel TM-CY10, 36/22

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

Saddle - Bontrager Verse Short, stainless steel rails

Seatpost - Bontrager alloy, 31.6 mm, 12 mm offset

Handlebar - Bontrager alloy, 31.8 mm

Grips - Bontrager XR Endurance Comp, lock-on

Stem - Bontrager alloy, 31.8 mm, Blendr-compatible, 7-degree

Head set - Semi-integrated, 1-1/8"

Brake - Tektro MD-M280 mechanical disc and Tektro MD-M281 mechanical disc

Brake rotor - Tektro, 6-bolt, 160mm

Weight - Medium size - 14.60 kg / 32.19 lbs

Weight limit - This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).

Sizes L, M, ML, S, XL, XS, XXL
Brand Trek
Model Year 2024
Barcodes 768682161173, 768682161197, 768682161210, 768682161234, 768682161258, 768682161418, 768682161470, 768682161517, 768682161531, 768682182291, 768682182314, 768682182338, 768682182352, 768682182376, 768682182390, 768682182413, 768682182437, 768682182451, 768682182475, 768682182499, 768682182512, 768682182550, 768682182574, 768682182598, 768682182635, 768682182659, 768682182673, 768682182734
SKUs / Part Numbers 5301834, 5301835, 5301836, 5301837, 5301838, 5301839, 5301840, 5301841, 5301842, 5301843, 5301844, 5301845, 5301846, 5301847, 5301848, 5301849, 5301850, 5301851, 5301852, 5301853, 5301854, 5301855, 5301856, 5301857, 5301858, 5301859, 5301860, 5301861

Please note: Manufacturers can sometimes change the specification of the products from time to time.

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