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Description
trek mountainbike marlin 4 Trek Marlin 4 Gen 3, MD, Blue SageMarlin 4 is a trail worthy daily rider that's perfectly suited for everyday adventures, on and off the trail. It features a trail savvy frame with a suspension fork, 8 speed Shimano ESSA shifting, and mounts for a rack and kickstand that make it an ideal choice for trail riders or anyone looking for a comfortable, stable commuter with the ruggedness of a real mountain bike. Will my bike have a curved top tube? Smaller frames have a top tube that dips
Marlin 4 is a trail-worthy daily rider that's perfectly suited for everyday adventures, on and off the trail.
It features a trail-savvy frame with a suspension fork, 8-speed Shimano ESSA shifting, and mounts for a rack and kickstand that make it an ideal choice for trail riders or anyone looking for a comfortable, stable commuter with the ruggedness of a real mountain bike.
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.
Sizing & Fit
This Medium frame generally fits someone from 5'4" to 5'9", but there are some other factors, like arm and leg length, that determine a great fit. That’s why the best way to find your perfect fit is to consult the experts here at Sunshine Bicycle Center.
Specifications
*spec applies to all sizes unless otherwise noted
- Frame:
- Size: XXS , XS: Alpha Silver Aluminum, curved top tube, internal derailleur & dropper post routing, rack and kickstand mount, 135x5mm ThruSkew
- Size: S , M , ML , L , XL: Alpha Silver Aluminum, internal derailleur & dropper post routing, rack and kickstand mount, 135x5mm ThruSkew
- Fork:
- Size: XXS: SR Suntour XCM 30, coil spring, preload, hydraulic lockout, 42mm offset for 26'' wheel, 100mm QR, 100mm travel
- Size: XS: SR Suntour XCE 28, coil spring, preload, 42mm offset for 27.5'' wheel, 100mm QR, 80mm travel
- Size: S: SR Suntour XCE 28, coil spring, preload, 42mm offset for 27.5'' wheel, 100mm QR, 100mm travel
- Size: M , ML , L , XL: SR Suntour XCE 28, coil spring, preload, 46mm offset for 29'' wheel, 100mm QR, 100mm travel
- Hub front: Formula DC-20, alloy, 6-bolt, 5x100mm QR
- Hub rear: Formula DC-22, alloy, 6-bolt, Shimano 8/9/10 freehub, 135x5mm QR
Skewer rear: 173x5mm QR
- Rim: Bontrager Connection, double-wall, 32-hole, 20mm width, schrader valve
- Tire:
- Size: XXS: Bontrager Montrose Comp, wire bead, 30 tpi, 26x2.35''
- Size: XS , S: Bontrager Montrose Comp, wire bead, 30 tpi, 27.5x2.4''
- Size: M , ML , L , XL: Bontrager Montrose Comp, wire bead, 30 tpi, 29x2.4''
- Size: XXS: Bontrager Montrose Comp, wire bead, 30 tpi, 26x2.35''
- Shifter: Shimano M315, 8 speed
- Rear derailleur: Shimano ESSA U2000
- Crank:
- Size: XXS , XS: ProWheel alloy, 32T narrow-wide steel ring, 160mm length
- Size: S , M , ML: ProWheel alloy, 32T narrow-wide steel ring, 170mm length
- Size: L , XL: ProWheel alloy, 32T narrow-wide steel ring, 175mm length
- Size: XXS , XS: ProWheel alloy, 32T narrow-wide steel ring, 160mm length
- Cassette: Shimano HG300, 11-45, 8 speed
- Chain: KMC Z8.3, 8 speed
- Pedal: nylon platform
- Saddle: Bontrager Verse Short, stainless steel rails
- Seatpost:
- Size: XXS: Bontrager alloy, 31.6mm, 12mm offset, 300mm length
- Size: XS , S , M: Bontrager alloy, 31.6mm, 12mm offset, 330mm length
- Size: ML , L , XL: Bontrager alloy, 31.6mm, 12mm offset, 400mm length
- Size: XXS: Bontrager alloy, 31.6mm, 12mm offset, 300mm length
- Handlebar:
- Size: XXS , XS: Bontrager alloy, 31.8mm, 5mm rise, 690mm width
- Size: S : Bontrager alloy, 31.8mm, 15mm rise, 720mm width
- Size: M , ML , L , XL: Bontrager alloy, 31.8mm, 15mm rise, 750mm width
- Size: XXS , XS: Bontrager alloy, 31.8mm, 5mm rise, 690mm width
- Grips: Trek Line Comp, nylon lock-on
- Stem:
- Size: XXS , XS , S: Bontrager Comp, 31.8mm, 7 degree, 35mm length
- Size: M , ML , L: Bontrager Comp, 31.8mm, Blendr compatible, 7 degree, 50mm length
- Size: X: Bontrager Comp, 31.8mm, Blendr compatible, 7 degree, 60mm length
- Size: XXS , XS , S: Bontrager Comp, 31.8mm, 7 degree, 35mm length
- Headset: Semi-integrated, 1-1/8''
- Brake:
- Size: XXS , XS , S: Tektro HD-M276 hydraulic disc
- Size: XXS , XS , S , M , ML , L , XL: Power BH-M286TF hydraulic disc, 160mm rotor
- Size: M , ML , L , XL: Tektro HD-M275 hydraulic disc
- Size: M , ML , L , XL: Power BH-M286TF hydraulic disc, 180mm rotor
- Size: XXS , XS , S: Tektro HD-M276 hydraulic disc
- Brake rotor:
- Size: XXS , XS , S , M , ML , L , XL: Tektro, 6-bolt, 160mm
- Size: M , ML , L , XL: Tektro, 6-bolt, 180mm
- Size: XXS , XS , S , M , ML , L , XL: Tektro, 6-bolt, 160mm
- This bike has a maximum total weight limit (combined weight of bicycle, rider, and cargo) of 300 pounds (136 kg).
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.2 ★★★★★
Based on 1253 reviews
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Product Reviews
★★★★★ 5
Much Needed Cabin Air Filter Replacement!
This Cabin air filter replacement is working well. It had been a long time since I replaced my cabin filter, so this was a much needed replacement. It was easy to do, and a much needed replacement. The air quality inside my car is much better. It smells fresh, and light and airy now.
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Reviewed in the United States on March 29, 2026
★★★★★ 5
Best cabin filter I've ever seen
This is the most complex and over-engineered cabin air filter I have ever seen, and I mean that in a good way! The overall shell is a hard plastic, and inside it are two basic parts; the filter (HEPA quality) and the loose fill activated charcoal. The filter media appears to be operating room quality, and if I were to guess, I would say it's like a MERV 14 or greater. The pleats are plentiful, and the spacing of the pleats are perfect, as well as the attachment of the media to the filter frame. The charcoal is a loose style fill, and it fits between the back of the filter media and the filter screen on the very back. This must have 5 times the amount of charcoal compared to the charcoal infused media you can get from many suppliers. The frame fits perfect in my 4runner, and it is hard plastic with good gasket material to further help the effectiveness of the media.
All in all, this is an incredibly engineered filter, and if you're the type that wants nothing but the best for your vehicle, you've come to the right place by choosing this one. It is pricey, at $20 for one filter at the time of writing this review, but this is a textbook case of "you get what you pay for." I am going to start only buying these from now on, as they are the best quality and construction filter I have seen, and I highly recommend this filter!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 3, 2025
★★★★★ 4
A Simple, Affordable Cabin Filter That Does the Job
I have a mechanic I really trust, which is no small thing these days. The trade off is that he charges a little more for routine services like oil changes, and those visits always include a full vehicle inspection. To manage the cost, I make a point of handling the easy maintenance items myself so he does not feel the need to replace them with higher priced OEM parts. Cabin air filters fall squarely into that category. It takes me about two minutes to replace one, and doing it myself typically saves around fifty dollars. That was the motivation behind picking up this filter for my Toyota Sienna.
Right out of the package it fit perfectly. The size is exact, which is important since cabin filters need a snug frame to work properly. There is a clear airflow direction arrow printed on the side, which is one of the two key things I always look for. Without that, it becomes guesswork and you risk installing the filter backward. With the arrow in place, installation is a quick slide and close operation.
Functionally, cabin filters are hard to evaluate in real time. You do not get a dramatic change the moment you swap them out. What I rely on instead is whether they fit correctly, whether they load evenly over time and whether they avoid shedding material as they age. Based on construction and feel, this one meets those expectations. It is pleated well and the frame holds its shape. All signs point to it filtering properly, which is the baseline requirement.
Because cabin filters need changing fairly often, it never makes sense to overspend on OEM versions unless you have a specific airflow sensitivity or unique environmental need. This filter costs far less and performs the key functions just as well for general use. In my Southern California environment, where dust and pollen appear regularly, I prefer to replace filters on the more frequent side, which makes the lower cost even more practical.
The simplicity of the whole process is what I appreciate most. No tools, no struggle, no surprises. The filter pops in cleanly, the compartment closes and the job is done. When paired with the peace of mind of not paying dealership pricing for such a simple part, it becomes an easy product to recommend. A dependable, properly fitting cabin filter at a very reasonable price. Four stars.
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Reviewed in the United States on December 4, 2025
★★★★★ 5
So premium I can't even test the quality
edit- after about six weeks of driving through various conditions I can say that the air quality this filter produces is excellent., removing all smoggy odor. There is a minor soapy smell that is not offensive, just unusual. So I am very pleased with this item.
original review-
This really seems like a premium upgrade compared to the budget filters I normally buy. Unfortunately I live in a hot and dry climate (no humidity buildup to cause musty or sour odors and AC always running which dries the air also) and I do not smoke so I never have any odor problems in my vehicle to test the charcoal feature with. I also am not prone to dust allergies so I don't know how helpful the HEPA feature is.
If I get stuck in traffic in a smoggy area or behind an especially smoggy vehicle I will switch to fresh air mode to learn if the charcoal feature helps and update this review.
There is no paperwork in the box or arrows printed on the filter to determine which way to insert it. I am assuming the airflow path is downward and should pass through the paper side first, so I installed the paper side up.
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Reviewed in the United States on November 9, 2025
★★★★★ 5
It's a fit
This was a good fit for my 2010 Camry. Way nicer than the air filter I had in there before. I don't know what all those charcoal things do but it makes me feel like my car will have better air than the rest of of life. All the packaging and labels were Chinese, so I had to take my best guess about which way the air was supposed to flow. Other than that it was pretty easy to install. Just stick it in the hole. Seems to work well, I haven't noticed any new noises. Seems like a higher end filter.
Hopefully it lasts the ten years before I change it next
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Reviewed in the United States on November 9, 2025