The 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.
You want an introductory mountain bike at an incredible price, but also want a commuter that's rugged enough to hop kerbs on the way to class. 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.
A lightweight aluminium frame with internal routing to protect your cables and add to the bike's sleek look, trustworthy 14-speed Shimano shifting with a wide range of gearing so you always have the right gear for your terrain, powerful disc brakes and a suspension fork that takes the edge off bumps and rough terrain. A lightweight aluminum frame with internal routing to protect your cables and add to the bike's sleek look, trustworthy 14-speed Shimano shifting with a wide range of gearing so you always have the right gear for your terrain, powerful disc brakes, and a suspension fork that takes the edge off bumps and rough terra
The Marlin is made for any adventure. The rack and mudguard mounts make it a great choice for commuters who want to get a little rad on the way to class or the shops. 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.
- The Marlin Gen 2 is ready to roll with easy to use features that help you get the best bang for your buck 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 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 Smaller frame sizes (XS and S) have short-reach brake levers that make it easier and more comfort
- 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 Marlin models in XS and S frame sizes have a curved top tube and a lower standover height that mak
- Like every Trek, it's backed by a lifetime warranty Like every model in the Marlin family, it's backed by Trek's lifetime warranty
Will my bike have a curved top tube?
Smaller frames 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. Larger frame sizes have a straight top tube because taller riders with longer legs typically don't have the same issues with standover height.
Fit for every rider
Marlin comes in seven frame sizes to suit riders of any height, and Smart Wheel Size ensures you're on the fastest wheel that fits. The smallest sizes even come with short-reach brake levers and narrower handlebars that give smaller riders better comfort and control.
High tech, high value
Marlin looks and feels great. It's packed with features usually found only on more expensive bikes, like a stylish frame with internal shift cable and brake hose routing, which can help your cables last longer by protecting them from the elements.
Upgrade your pedals and love your bike more
Pedals are two of the five touchpoints that connect you with your bike, and even though this bike comes with a pair, upgrading to pedals that boost control and grip will greatly improve your ride. See the pedal guide and find the best pedals for your riding style. We recommend flat pedals for simple versatility.
0% APR Finance with Just a 10% Deposit
Looking to spread the cost of your new road, mountain, electric or commuter bike?
We’ve partnered with Novuna Personal Finance to offer flexible payment options both online and in-store.
✔ 0% APR available over 6, 12, 18 or 24 months
✔ Interest-bearing finance available over 12, 24, 36 or 48 months
✔ Only 10% deposit required
✔ Minimum spend £675
Finance makes it easier to get the bike you want — without the upfront hit.
Please note: 0% finance may not be available on selected discounted products.
Finance Options at a Glance
Term (Months)
APR
Deposit
6, 12, 18, 24
0%
10%
12, 24, 36, 48
15.9% Representative
10%
Credit subject to status and affordability. Terms & Conditions apply.
Finance is provided by Novuna Personal Finance, a trading style of Mitsubishi HC Capital UK PLC, authorised and regulated by the Financial Conduct Authority (FRN 704348).
The Financial Services Register can be accessed at www.fca.org.uk.
With 0% finance, you pay no interest — just the bike, split into manageable payments.
How to Apply
Online:
Add your items to the basket, select the finance option at checkout, and complete the secure online application.
In-store:
Let one of our team know you’d like to pay by finance and we’ll guide you through the process.
Applications usually take just a few minutes, and you’ll often receive a decision quickly.
Once approved, you can e-sign your agreement or print and return it. Goods are dispatched once your signed agreement has been received and processed.
Finance FAQ
Who can apply?
You must:
Be 18 or over
Be a UK resident (minimum 12 months)
Work at least 16 hours per week, or be retired with an income
Have a UK bank account
Unfortunately, finance is not available to residents of the Republic of Ireland.
When do repayments start?
Your first repayment will be taken approximately one month after your purchase has been delivered.
Are there any hidden fees?
No. There are no arrangement fees or hidden extras.
What happens if my application is declined?
Applications are assessed using credit scoring and checks with credit reference agencies. If declined, you may reapply after 6 months, as circumstances can change.
Need Help?
If you have any questions about finance, call us on 01363 774773 and our team will be happy to help.
Here at the Bike Shed we always strive to offer value for money and offer friendly expert advice on the best quality products we can source.
We are great supporters of shopping locally due to the benefits it has on our local economy, employment, and community. However, we do not want to see you disadvantaged by choosing to shop with us and we, therefore, will match any UK based competitors’ prices on the following conditions:
• The product must be available with the UK supplier even if discontinued or an older model.
• If assembly is required there may be an additional charge for this. Please note: If the Bike Shed assembles your bike not only will your warranty be more robust you also qualify for a free first service with us.
• We reserve the right to contact the seller to verify the price/availability/accuracy etc.
• Used, ex-demo, ex-display, returns, and all online auction sites do not qualify.
Where the item does not match the above, we still attempt to be competitive in terms of price, quality, and service.
We reserve the right to decline the price promise at our own discretion
Buy a bike from the Bike Shed and your first service is on us!
Simply arrange a convenient time with your local store and our bike mechanics will give your bike a thorough check and tune up to ensure you're riding as smoothly and efficiently as possible.
Your free service needs to be taken between approximately 6 weeks and a maximum of 3 months from the date of purchase.
Please note: To qualify for the free service you are responsible for bringing your bike into a store. Unfortunately collections are not possible.
Looking for a more comprehensive service? Check out our workshop page for more details
*Frame
Size:Â XS , S Alpha Silver Aluminium, curved top tube, internal routing, chainstay disc brake mount, rack and kickstand mount, 135x5 mm QR
Size:Â M , ML , L , XL , XXL Alpha Silver Aluminium, internal routing, chainstay disc-brake mount, rack and kickstand mount, 135x5 mm QR
*Fork
Size:Â XS SR Suntour XCE 28, coil spring, preload, 42 mm offset for 27.5" wheel, 100 mm QR, 80 mm travel
Size:Â S SR Suntour XCE 28, coil spring, preload, 42 mm offset for 27.5" wheel, 100 mm QR, 100 mm travel
Size:Â M , ML , L , XL , XXL SR Suntour XCE 28, coil spring, preload, 46 mm offset for 29" wheel, 100 mm QR, 100 mm travel
Max compatible fork travel
100mm (XS and S: 490mm axle-to-crown, M and up: 509mm axle-to-crown)
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
Our size guides are a helpful starting point, but they’re only a guide. For complete confidence, check the brand’s sizing advice or pop into one of our stores — because nothing beats sitting on your new bike to make sure it feels spot on.
Trek Road Bikes
Madone, Emonda, Domane, Silque, Lexa, Boone, 1 Series
The easiest way to determine your frame size is by height, but many riders find that they are between sizes. Choosing to go up or down a size depends on your personal riding style and body proportions.
A bike with a longer reach will have a longer wheelbase. That makes it more stable, especially on high-speed descents. That’s great for riders who like to plough through rather than pop over rough stuff on the trail. If you have a relatively long torso or arms for your height, you may find that a longer reach gives you a roomier, more comfortable cockpit.
A bike with a shorter reach will have a shorter wheelbase. It’s not as stable, but it’s more nimble and easier to flick around. That’s great for riders with a more playful, active riding style who like to get off the ground and whip their wheels around. If you have a relatively short torso or arms for your height, you may find that a shorter reach makes it easier for you to hold the handlebars comfortably.
Effective top tube
Effective top tube is the horizontal distance from the centre of the head tube to the centre of the seat post. This measurement represents how a mountain bike fits while you’re sitting on the saddle. It’s important for cross country riders, who prioritise pedalling power.
Reach
Reach is the horizontal distance from the centre of the head tube to a vertical line that runs through the centre of the bottom bracket shell. This measurement represents how a mountain bike fits when you’re standing up on the pedals, like when you’re descending. Since most trail riders prioritise out-of-the-saddle riding, this tends to be the most helpful metric when comparing bike sizes from different brands.
General Size Guide
Our size guides are a helpful starting point, but they’re only a guide. For complete confidence, check the brand’s sizing advice or pop into one of our stores — because nothing beats sitting on your new bike to make sure it feels spot on.
General Bike Size Guide
Choosing the right bike size makes a huge difference to comfort, control and efficiency. Use the guide below to find the ideal frame size for your height and inside leg measurement.
What You Need
Your Height
Stand with your back against a wall, shoes off, feet together. Mark the wall above your head with a pencil, then measure from the floor to the mark.
Your Inside Leg Length
Stand with your back against a wall, shoes off. Place a book or ruler between your legs (as if sitting on a saddle) and measure from the floor to the top of the book/ruler. Having someone assist makes this easier.
Remember: This guide provides general sizing only. Different brands may vary. If you’re unsure, speak to the Bike Shed team on 01363 774773 or send us a message — we’re always happy to help.
Mountain Bike Sizing (Men)
Height
Inside Leg
Recommended Size
147–152cm / 4'10"–5'0"
66cm / 26"
13” (X Small)
152–160cm / 5'0"–5'3"
69cm / 27"
13”, 14” (X Small)
160–170cm / 5'3"–5'7"
71cm / 28"
15”, 16" (Small)
170–175cm / 5'7"–5'9"
76cm / 30"
17", 18” (Medium)
175–180cm / 5'9"–5'11"
79cm / 31"
18”, 19" (Medium, Large)
180–188cm / 5'11"–6'2"
81cm / 32"
19", 20” (Large)
188–196cm / 6'2"–6'5"
86cm / 34"
20", 21”, 22” (Large, X Large)
196cm+ / 6'5"+
91cm / 36"
23", 24” (XX Large)
Mountain Bike Sizing (Women)
Height
Inside Leg
Recommended Size
147–155cm / 4'10"–5'1"
66cm / 26"
13”, 14" (X Small)
155–160cm / 5'1"–5'3"
69cm / 27"
13”, 14” (X Small)
160–165cm / 5'3"–5'5"
71cm / 28"
15”, 16" (Small)
165–172cm / 5'5"–5'8"
76cm / 30"
17", 18” (Medium)
172cm+ / 5'8"+
79cm / 31"
19" (Large)
Road Bike Sizing (Men)
Height
Inside Leg
Recommended Size
147–152cm / 4'10"–5'0"
66cm / 26"
47–48cm (XX Small)
152–160cm / 5'0"–5'3"
69cm / 27"
49–50cm (X Small)
160–170cm / 5'3"–5'7"
71cm / 28"
51–53cm (Small)
170–175cm / 5'7"–5'9"
76cm / 30"
54–55cm (Medium)
175–180cm / 5'9"–5'11"
79cm / 31"
56–58cm (Large)
180–188cm / 5'11"–6'2"
81cm / 32"
59–60cm (X Large)
188–196cm / 6'2"–6'5"
86cm / 34"
60–62cm (X Large, XX Large)
196cm+ / 6'5"+
91cm / 36"
62–63cm (XX Large)
Road Bike Sizing (Women)
Height
Inside Leg
Recommended Size
147–155cm / 4'10"–5'1"
66cm / 26"
44–46cm (XX Small)
155–160cm / 5'1"–5'3"
69cm / 27"
47–49cm (X Small)
160–165cm / 5'3"–5'5"
71cm / 28"
50–52cm (Small)
165–172cm / 5'5"–5'8"
76cm / 30"
53–55cm (Medium)
172cm+ / 5'8"+
79cm / 31"
56–57cm (Large)
Hybrid Bike Sizing (Men)
Height
Inside Leg
Recommended Size
147–152cm / 4'10"–5'0"
66cm / 26"
13”, 14" (X Small)
152–160cm / 5'0"–5'3"
69cm / 27"
14”, 15” (X Small, Small)
160–170cm / 5'3"–5'7"
71cm / 28"
15”, 16" (Small)
170–175cm / 5'7"–5'9"
76cm / 30"
17", 18” (Medium)
175–180cm / 5'9"–5'11"
79cm / 31"
19”, 20" (Large)
180–188cm / 5'11"–6'2"
81cm / 32"
20", 21” (Large, X Large)
188–196cm / 6'2"–6'5"
86cm / 34"
21”, 22” (Large, X Large)
196cm+ / 6'5"+
91cm / 36"
23", 24” (XX Large)
Hybrid Bike Sizing (Women)
Height
Inside Leg
Recommended Size
147–155cm / 4'10"–5'1"
66cm / 26"
13”, 14" (X Small)
155–160cm / 5'1"–5'3"
69cm / 27"
14”, 15” (X Small, Small)
160–165cm / 5'3"–5'5"
71cm / 28"
15”, 16" (Small)
165–172cm / 5'5"–5'8"
76cm / 30"
17", 18” (Medium)
172cm+ / 5'8"+
79cm / 31"
19" (Large)
Special Order Enquiry 2025 Marlin 4 Gen 2
Calculate finance options...
How much deposit?
£245
£50 (10%)
drag slider to change deposit
Total cost on finance:
£0.00
with a £ 0.00
deposit.
The total charge for credit is £ 0.00.
Choose an available finance option:
Unfortunately, no options
are
available.
WANT TO APPLY? To apply, add the item to your basket and apply for
finance on your entire basket.
Please note the above quotation is an indicative cost and actual monthly payments may vary by
+/- 2p per month.
Credit subject to status and affordability. Terms & Conditions Apply. Bike Shed is a credit broker and is Authorised and Regulated by the Financial Conduct Authority.
Credit is provided by Novuna Personal Finance, a trading style of
Mitsubishi HC Capital UK PLC, authorised and regulated by the
Financial Conduct Authority. Financial Services Register no.
704348. The register can be accessed through http://www.fca.org.uk.
24 Month Representative Example:
Purchase Price (incl. VAT) £750
Deposit £75
Loan Amount £675
Interest/Total Charge for Credit £109.32
Total Amount Repayable £859.32
Balance Payable £784.32
By 24 Monthly Repayments of £32.68
15.9% APR Representative
Bank rate of interest 8.1% PA fixed
Please note the above quotation is an indicative cost and actual monthly payments may vary.
For Buy Now Pay Later and Deferred Interest Bearing Credit: Interest is charged from day 1 of your agreement, but not charged on any repayments made during the deferral period. On expiry of the deferral period, interest accrued during the deferral period will be applied to your repayments.
Consumer credit services are only available to over 18s and
subject
to status.
This is for estimation purposes only. Actual Finance Application
is
Completed During Checkout.
