Trek 1120 Frameset

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An Expedition Bikepacking Frameset Built for the World's Most Remote Destinations The Trek 1120 Frameset is an Alpha Platinum Aluminum expedition bikepacking frame designed to go f urther than any other bikepacking platform - built for 29+ tyres, loaded with mounts for carrying significant gear, and engineered with the practical features that matter when riding in genuinely remote locations far from support. This is not a weekend adventure bike with bikepacking bags added - it is a purpose-built expedition frame designed from the ground up for multi-day and multi-week backcountry travel where the bike is both a performance trail tool and a load carrier. The frame uses a tapered head tube for front-end stiffness, internal routing for both the derailleur cable and dropper post, proprietary rack mounts for the Trek 1120 rack and harness system, horizontal sliding dropouts for geometry adjustment and singlespeed conversion, Boost148 rear axle spacing for wider flange stiffness and improved wheel strength under load, and a 12mm thru-axle for secure and precise rear wheel positioning. The FSA Integrated headset uses sealed cartridge bearings with a 1-1/8 inch top and 1.5 inch bottom tapered configuration. All components beyond the frameset and headset must be sourced separately as part of the custom build. This boundary-expanding bike is ready to be spec’d for however you love to adventure Our 1120 rack and durable harness system (sold separately) make it easy to secure 8L bags on the rear rack and additional gear up front for the best packing balance So many mounting features let you set up your ideal expedition ride as you see fit It's also an awesome mountain bike — if you're looking to tear up some singletrack, just pull off the racks The horizontal sliding dropout lets you dial in your geometry and easily convert to singlespeed if your derailleur busts out in the wild 29+ Tyres, Proprietary Rack Mounts, and 8L Rear Bag System The 1120 is designed around 29+ tyre compatibility - the 3-inch wide tyre format that provides the float, traction, and obstacle clearance needed for genuine off-road expedition riding where trail surfaces cannot be predicted or chosen. On remote backcountry routes and trails far from maintained paths, the additional grip and compliance of a 29+ tyre is a meaningful practical advantage over a standard-width 29er tyre. The proprietary rack mounts are designed to accept Trek's 1120 rack and harness system, available separately. The harness system secures 8-litre bags on the rear rack with a designed balance between front and rear load distribution that matters on loaded expedition rides where weight balance directly affects handling and control. Additional mounting features throughout the frame allow configuration for whatever carrying setup the rider's adventure requires - front fork mounts, frame triangle mounts, and additional attachment points that reflect the frame's role as an expedition tool rather than a stripped-back performance frame. Trek notes the 1120 is also a capable singletrack mountain bike - the racks and carrying system can be removed and the frame ridden as an aggressive trail bike on 29+ tyres, making it a genuinely dual-purpose platform rather than a dedicated cargo frame that sacrifices trail capability for carrying capacity. Horizontal Sliding Dropouts and Singlespeed Conversion The horizontal sliding dropout is one of the 1120's most practically significant features for expedition riders. Sliding dropouts allow the rear axle position to be adjusted within a horizontal slot, providing two distinct capabilities. The first is chain tension management for singlespeed use - if a derailleur is damaged or fails in a remote location where replacement is impossible, the 1120 can be converted to singlespeed operation by removing the derailleur and tensioning the chain through rear axle position adjustment. This repairability in the field is a genuine expedition-specific feature. The second capability is geometry adjustment - moving the rear axle forward or backward changes the effective chainstay length, allowing subtle handling changes to suit the rider's preference or the terrain being covered. FAQs What tyre size is the Trek 1120 Frameset designed for? The frame is designed for 29+ tyres - the 3-inch wide format that provides float, traction, and obstacle clearance for expedition and backcountry riding. What rack system is compatible with the 1120 Frameset? The frame uses proprietary rack mounts designed for Trek's 1120 rack and harness system, available separately. The harness system secures 8-litre bags on the rear rack. Does the 1120 support a dropper post? Yes. The frame includes internal routing for a dropper post. What are the horizontal sliding dropouts for? The sliding dropouts allow geometry adjustment via rear axle position, and critically enable singlespeed conversion by allowing chain tension to be set through axle position rather than a separate tensioner. This makes the bike repairable in remote locations if a derailleur is damaged. What axle standard does the 1120 Frameset use? The frame uses a 12mm thru-axle at Boost148 rear spacing - a wider flange spacing that improves wheel stiffness under the heavier loads of expedition riding. Can the 1120 be used as a trail mountain bike without cargo? Yes. Trek explicitly describes the 1120 as an awesome mountain bike - the racks and carrying system can be removed and the frame ridden as a capable 29+ singletrack bike. What components are included with the 1120 Frameset? The frameset includes the frame and an FSA Integrated sealed cartridge bearing headset. All other components including the fork, drivetrain, wheels, cockpit, and rack system must be sourced separately. Specs: Frame Alpha Platinum Aluminum, tapered head tube, internal derailleur & dropper post routing, proprietary rack mounts, horizontal sliding dropouts, Boost148, 12mm thru axle Headset FSA Integrated, sealed cartridge bearing, 1-1/8'' top, 1.5'' bottom Geometry Chart B B Drop 7.6 B B Height 31.4 Chainstay Length 44 Eff Top Tube 56 Frame Reach 39.6 Frame Size Letter S Frame Size Number 15.5 Frame Stack 63.4 Head Angle 70.4° Head Tube Length 10 Offset 5.1 Seat Tube 39.4 Seat Tube Angle 73.5° Standover 77.8 Trail 8.5 Wheelbase 108.2 Wheel Size 29+ Color MATTE NAUTICAL NAVY { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "What tyre size is the Trek 1120 Frameset designed for?", "acceptedAnswer": { "@type": "Answer", "text": "The frame is designed for 29+ tyres - the 3-inch wide format that provides float, traction, and obstacle clearance for expedition and backcountry riding." } }, { "@type": "Question", "name": "What rack system is compatible with the 1120 Frameset?", "acceptedAnswer": { "@type": "Answer", "text": "The frame uses proprietary rack mounts designed for Trek's 1120 rack and harness system, available separately. The harness system secures 8-litre bags on the rear rack." } }, { "@type": "Question", "name": "Does the 1120 support a dropper post?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. The frame includes internal routing for a dropper post." } }, { "@type": "Question", "name": "What are the horizontal sliding dropouts for?", "acceptedAnswer": { "@type": "Answer", "text": "The sliding dropouts allow geometry adjustment via rear axle position, and critically enable singlespeed conversion by allowing chain tension to be set through axle position rather than a separate tensioner. 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All other components including the fork, drivetrain, wheels, cockpit, and rack system must be sourced separately." } } ] } Show more