Excellent quality mountain bike used a few times but now sitting and need somebody to ride it. Has very comfortable suspension. Frame The Marlin 4 frame is made of aluminum.. Trek has been making high-end aluminum frames for decades, and that experience shows in their entry-level frames. The Marlin 4 frame is not the lightest on the market, but the welds are clean and solid, the paint job is first class, and the frame looks like something you’d find on a much more expensive bike. The cables that control the brakes and gear shifting are routed inside the frame tubes, which keeps the outside clean and uncluttered and reduces the likelihood of damage. The small and extra small Marlin 4 frames feature a top tube that curves down, decreasing the bike’s standover height and making it easier to straddle the bike without the frame hitting you in the crotch. That’s a detail that smaller riders will appreciate. Suspension The Marlin 4 carries a front suspension fork from SR Suntour, a leading Japanese producer of mountain bike suspension. SR Suntour forks lack the light weight and multiple adjustments of high end mountain bike forks, but they absorb impact and they stand up to abuse. The SR Suntour XCE fork on the Marlin 4 may not set you up for huge hucks or win you bling points at the bike shop, but it will soak up the chatter and take impacts off your hands and arms. The suspension travel on the Marlin 4 is 100mm, except for the XS version, which gets an 80mm fork. That’s low by today’s standards, but it’s enough for the type of riding the bike was designed to do. Drivetrain The drivetrain is everything that transmits power from the pedals to the rear wheel. This includes the crank, the chain, the front and rear gear sprockets, the front and rear derailleurs that move the chain from one gear to the next, and the handlebar-mounted shifters that control the derailleurs. The Marlin 4 carries a 3×7 drivetrain: there are three gears in the front and 7 in the rear. The gear range is not exceptionally wide and could be a problem if you will spend a lot of time riding steep hills.