Experience the next evolution of speed with the 2025 Trek Madone SL 6 AXS Gen 8. This is the bike that redefines what an all-rounder can be, merging the aerodynamic dominance of the Madone lineage with the lightweight climbing prowess of the now-retired Émonda to create the ultimate one-bike quiver . Built around a refined 500 Series OCLV Carbon frame featuring innovative IsoFlow comfort technology, and equipped with SRAM’s fully wireless Rival AXS 12-speed electronic groupset complete with a power meter, this Medium-sized machine is engineered for riders who demand race-winning performance, customizable shifting, and a sublime balance of speed, comfort, and value .

Frame and Fork

Frame: The heart of the Madone is its all-new 500 Series OCLV Carbon frame . It features Full System Foil tube profiles, an aerodynamic tube shaping philosophy that optimizes airflow around the entire bike to cheat the wind without adding weight . The defining feature is the IsoFlow seat tube—a cleverly designed opening below the saddle that not only manages airflow for a marginal aero gain but also introduces vertical compliance, effectively smoothing out rough pavement to keep you fresher on long rides . The frame utilizes a practical T47 threaded bottom bracket for durability and creak-free performance, a Universal Derailleur Hanger (UDH) for easy replacement, and clean internal cable routing .
Fork: The matching Madone Gen 8 full carbon fork features a tapered carbon steerer for precise, confidence-inspiring steering and is designed for seamless integration with the frame’s internal brake routing .

Drivetrain

Shifting: At the core of this build is the SRAM Rival eTap AXS 12-speed wireless electronic groupset . Shifting is crisp, instantaneous, and fully customizable via the SRAM AXS app, allowing you to program shift sequences and check battery levels from your handlebar .
Rear Derailleur: The SRAM Rival AXS rear derailleur features a clutch mechanism for a stable, quiet chain and precise shift quality, even under full power .
Crankset & Power Meter: Power delivery is handled by a SRAM Rival AXS crankset with an integrated power meter . This is an invaluable tool for training and racing, allowing you to precisely monitor your output and pace your efforts. For the size Medium frame, the crank arms are sized at 170mm to optimize fit and power transfer .
Cassette: The wide-ranging SRAM XG-1250 10-36T 12-speed cassette provides a perfect gear for every situation, from steep climbs to high-speed descents and sprints .

Cockpit and Finishing Kit

Handlebar & Stem: The cockpit is clean, functional, and designed for easy adjustability. It features a Bontrager Comp alloy handlebar (80mm reach, 121mm drop) with a width of 38cm at the controls and 42cm at the drops for the Medium size . It’s paired with a Trek RCS Pro alloy stem (90mm length, -7-degree rise) that features hidden cable routing for a clean aesthetic without the complexity of a fully integrated bar .
Seatpost: The proprietary Madone aero carbon seatpost (0mm offset, short length) integrates seamlessly with the IsoFlow frame design, contributing to both the bike’s aerodynamic profile and its compliant ride quality .
Saddle & Tape: Comfort is provided by the Bontrager Aeolus Comp saddle with durable steel rails. For the size Medium, this is the 145mm width version, paired with Bontrager handlebar tape .

Brakes

Confident and consistent stopping power comes from SRAM Rival hydraulic disc brakes . Paired with 160mm SRAM Paceline CenterLock rotors (rounded, for safety), these brakes offer excellent modulation and reliable performance in all weather conditions, giving you the confidence to brake later and corner harder .

Wheels and Tires

Wheelset: The Madone rolls on a superb Bontrager Aeolus Elite 35 wheelset . These OCLV Carbon rims feature a 35mm depth, striking an excellent balance between aerodynamic efficiency and lightweight, responsive performance. They are also Tubeless Ready (TLR) , allowing for lower pressures, reduced rolling resistance, and fewer flats. Notably, for 2025, this model comes set up tubeless from the factory—a Trek performance road first .
Tires: It is fitted with fast-rolling and grippy Bontrager R3 Hard-Case Lite tires in a 700x28c size, offering excellent puncture protection and a supple ride . The frame officially clears tires up to 32mm, providing options for increased comfort on rough roads .

Sizing: The “Medium” Fit

This size Medium frame is engineered for optimal performance and fit for a wide range of riders.

Rider Height: Designed to fit riders approximately 162cm to 173cm (5’4″ to 5’8″) tall .
Key Geometry (Size Medium): The bike features a modern race geometry with a reach of 384mm and a stack of 546mm . This places the rider in a sporty, efficient, and powerful position for both climbing and sprinting. The 72.9° head tube angle and 410mm chainstays provide planted, high-speed stability while remaining agile in the turns .

Why This Bike?

The 2025 Trek Madone SL 6 AXS Gen 8 is a landmark bike that signals a new era of versatility. By successfully blending the speed of an aero bike with the climbing efficiency of a lightweight race bike, Trek has created a machine that is “sharp as a knife” in its handling and performance . It delivers a ride that is “stunningly beautiful” yet “surprisingly comfortable,” encouraging you to “commit to corners” and “sprint, climb, and enjoy a lovely sporty position without riding a bouncing plank” . For the rider seeking a single bike that can handle criteriums, gran fondos, and weekend epics with equal aplomb, the Madone SL 6 AXS Gen 8 in size Medium is the definitive choice. As one reviewer put it, “This is everything I imagine a racing bike to be”