The Trek Madone SL 6 Gen 8 is a lightweight aero road bike that brings elite racing tech to a lower price point. It offers similar aero benefits to the pricier Madone SLR Gen 8, but with a more economical OCLV 500 Carbon lay-up and two-piece cockpit with hidden cable routing. It's built to race with geometry that keeps you comfortable on the climbs and perched for the attack. A Shimano 105 Di2 electronic group set keeps the price down without sacrificing lightning-fast electronic shifting. Plus, it's topped off with carbon wheels for extra lightweight performance.

The Revolutionary Full System Foil aero tube shapes redefine what fast looks like and help optimise aerodynamics around the whole bike
A more economical 500 Series OCLV Carbon frame and new tube shaping shave weight where it matters most to help you fly up climbs
Carbon wheels keep weight down and performance up, so you can crush climbs and soar down descents
You get lightning-fast shifts that stay crisp and clean thanks to Shimano's Di2 tech trickling down to their 105 group set
Lightweight, race-focused IsoFlow comfort tech helps you ride stronger longer without sacrificing weight or aerodynamics
This bike comes set up tubeless – a first in Trek performance road history

Sunset Cycles offers the 2025 Trek Madone SL 6 Gen 8 aero road bike in Matte Dark Web finish with up to 48 months 0% finance and free delivery.

Full Specification: Trek Madone SL 6 Gen 8 (Black) 2025 Aero Road Bike

Frame & Fork
Frame	500 Series OCLV Carbon, Full System Foil tube shaping, IsoFlow seat tube, RCS Headset System, electronic or mechanical routing, removable aero chain keeper, T47 BB, flat mount disc, UDH, 142x12 mm thru axle
Fork	Madone Gen 8 full carbon, tapered carbon steerer, internal brake routing, flat mount disc, 12x100mm chamfered thru axle
Wheels & Tyres
Wheel front	Bontrager Aeolus Elite 35, OCLV Carbon, Tubeless Ready, 35 mm rim depth, 100x12 mm thru axle
Wheel rear	Bontrager Aeolus Elite 35, OCLV Carbon, Tubeless Ready, 35 mm rim depth, Shimano 11/12-speed freehub, 142x12 mm thru axle
Tyre	Bontrager R3 Hard-Case Lite, Tubeless Ready, aramid bead, 170 tpi, 700x28 mm
Drivetrain
Shifter	Shimano 105 R7170, 12-speed
Front derailleur	Shimano 105 R7150 Di2, braze-on, down swing
Rear derailleur	Shimano 105 R7150 Di2, 36T max cog
Crank	Size: XS, S Shimano 105 R7100, 50/34, 165 mm length Size: M Shimano 105 R7100, 50/34, 170 mm length Size: ML, L Shimano 105 R7100, 50/34, 172.5 mm length Size: XL Shimano 105 R7100, 50/34, 175 mm length
Bottom bracket	Praxis, T47 threaded, internal bearing
Cassette	Shimano 105 7101, 11-34, 12-speed
Chain	Shimano SLX M7100, 12-speed
Components
Saddle	Size: XS, S Bontrager Aeolus Comp, steel rails, 155 mm width Size: M, ML, L, XL Bontrager Aeolus Comp, steel rails, 145 mm width
Seatpost	Size: XS, S, M Madone aero carbon seat post, 0 mm offset, short length Size: ML, L, XL Madone aero carbon seat post, 0 mm offset, long length
Handlebar	Size: XS Bontrager Comp, alloy, 31.8 mm, 80 mm reach, 121 mm drop, 36 cm control width, 40 cm drop width Size: S, M Bontrager Comp, alloy, 31.8 mm, 80 mm reach, 121 mm drop, 38 cm control width, 42 cm drop width Size: ML, L Bontrager Comp, alloy, 31.8 mm, 80 mm reach, 121 mm drop, 40 cm control width, 44 cm drop width Size: XL Bontrager Comp, alloy, 31.8 mm, 80 mm reach, 121 mm drop, 42 cm control width, 46 cm drop width
Stem	Size: XS Trek RCS Pro, -7-degree, 80 mm length Size: S, M Trek RCS Pro, -7-degree, 90 mm length Size: ML, L Trek RCS Pro, -7-degree, 100 mm length Size: XL Trek RCS Pro, -7-degree, 110 mm length
Brake rotor	Shimano RT70, CentreLock, 160 mm
Rotor size	Max brake rotor sizes: 180 mm front, 160 mm rear
Weight
Weight	ML - 8.16 kg / 17.99 lbs (with TLR sealant, no tubes)
Weight limit	This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 125 kg (275 lb).

Size Guide: Trek Madone SL 6 Gen 8 (Black) 2025 Aero Road Bike

Frame Size	Rider Height* (metric)	Rider Height* (imperial)
X Small	143 - 158 cm	4'8" - 5'2"
Small	158 - 162 cm	5'2" - 5'4"
Medium	162 - 173 cm	5'4" - 5'8"
Medium/Large	173 - 179 cm	5'8" - 5'10"
Large	179 - 188 cm	5'10" - 6'2"
X Large	188 - 213 cm	6'2" - 7'0"
*This is for guidance only. You may be taller or shorter, it doesn't mean our bikes will not fit you. The best way to determine the correct bike size for you is to try one. Please contact us if you are in any doubt about the correct bike size for you.