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Trek Domane SL 4 Disc Road Bike 2021

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Domane SL 4 Disc Road Bike 2021

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Product ID: 1081589

The Trek Domane SL 4 Disc Road Bike has undergone a number of changes to make it faster and more comfortable with increased versatility.

Constructed from Trek 500 Series OCLV carbon, aero tubing and internal cable routing to cut drag. There's clearance for 38mm tyres and updated IsoSpeed front and rear to absorb vibrations, while internal downtube storage keeps your pockets light. Built up with Shimano Tiagra components and rolling on Bontrager tubeless-ready disc wheels, reliability is guaranteed.

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Product Highlights


Lightweight and stiff, OCLV 500 carbon soaks up road vibrations and provides a comfortable ride.


Stopping in all conditions is consistent, modulated and powerful with this brake setup.


Dampening units in the seat tube and head tube markedly reduce rough road vibrations.


Room to fit high volume 38mm wide tyres allows the Domane to tackle the roughest roads.

Trek Domane SL 4 Disc Road Bike 2021

Versatile, fast and comfortable; introducing the Trek Domane SL 4 Disc Road Bike. A popular choice for riders looking to put in the miles in a slightly more relaxed position, the frameset has had a range of updates. The 500 Series OCLV carbon tubes have a more aerodynamic shape while cables are internally routed, significantly cutting drag. Improvements to the front and rear IsoSpeed mean that road buzz is more effectively absorbed and potential fatigue reduced.

Now taking up to 38mm tyres, you'll get incredible comfort even when the roads are rough. Fix mudguards to the hidden mounts and you'll still be able to fit 35c tyres. Another highlight is the frame integrated storage, so you can now carry more or keep your pockets lighter. Use the Bontrager Integrated Tool System (BITS) (purchased separately), and you can stow an inner tube, tyre levers and CO2 inside the downtube, as well as a BITS multitool (purchased separately) in the storage door.

This Domane SL has been built up with Shimano Tiagra hydraulic disc brakes and drivetrain so you can benefit from increased control at speed, and excellent reliability. The wheel and 32mm tyre combination is perfect for training and long rides alike, being robust, puncture-resistant and fast rolling.


  • Aerodynamic tube shapes
  • Trek 500 Series OCLV carbon frame
  • Front and rear IsoSpeed for the ultimate in vibration damping, smoothing even the roughest roads
  • Internal cable routing
  • Hidden mudguard mounts
  • Clearance for 38mm tyres (35mm with mudguards)
  • Shimano hydraulic disc brakes
  • Integrated frame storage - the Bontrager Integrated Tool System (BITS) (purchased separately) stores a tube, tyre levers, CO2 and CO2 head neatly inside the downtube
  • The bottle cage sits on an easy-open storage door and holds a BITS multi-tool (purchased separately) giving riders quick access for mechanical adjustments
  • Integrated Flare tail-light mount
  • To use the BITS Integrated Tool System you will need to additionally purchase the Bontrager BITS Bag and Bontrager BITS Integrated Multi-Tool

Technical Specification

Frame Trek 500 Series OCLV carbon, front and rear IsoSpeed, BITS internal storage, tapered head tube, internal cable routing, micro-adjust seat mast, 3S chain keeper, DuoTrap S-compatible, mudguard mounts, flat-mount disc, 142x12mm thru-axle
Fork Trek Domane SL carbon, tapered carbon steerer, internal brake routing, mudguard mounts, flat-mount disc, 12x100mm thru-axle
Headset FSA Integrated, sealed cartridge bearing, 1-1/8" top, 1.5" bottom
Bottom Bracket Praxis Works, T47 threaded, internal bearing
Stem Bontrager Elite, 31.8 mm, Blendr-compatible, 7-degree
Handlebar Bontrager Comp VR-C, alloy, 31.8mm
Front Brake Shimano Tiagra R4770 hydraulic disc
Rear Brake Shimano Tiagra R4770 hydraulic disc
Brake Levers Shimano Tiagra R4720
Front Derailleur Shimano Tiagra 4700, braze-on
Rear Derailleur Shimano Tiagra 4700, long cage
Shift Levers Shimano Tiagra R4720, 10-speed
Cassette Shimano Tiagra HG500, 12-28, 10-speed
Chain Shimano Tiagra HG54, 10-speed
Crankset Praxis Works Alba M30, 50/34 (compact), 30mm spindle
Front Wheel Hub - Bontrager alloy, sealed bearing, Center Lock disc, 100x12mm thru-axle / rim - Bontrager Affinity Disc, tubeless-ready, 24-hole, 21mm width
Rear Wheel Hub - Bontrager alloy, sealed bearing, Center Lock, Shimano 11-speed freehub, 142x12mm thru-axle / rim - Bontrager Affinity Disc, tubeless-ready, 24-hole, 21mm width
Front Tyre Bontrager R1 Hard-Case Lite, wire bead, 60tpi, 700x32c, clincher
Rear Tyre Bontrager R1 Hard-Case Lite, wire bead, 60tpi, 700x32c, clincher
Saddle Bontrager Arvada Comp, steel rails
Seatpost Bontrager carbon seat mast cap, integrated light mount, 20mm offset
Pedals Available to be purchased separately
Manufacturer Claimed Weight Size 56 - 9.87kg / 21.75 lbs

Built, Checked, Tuned and Tested

All our bikes are fully built, checked, tuned and tested by our Cytech qualified mechanics and then securely packaged, ready for delivery. All you have to do is add the pedals (if included), attach the handlebars to the stem and tighten them following the included detailed instructions or by watching our video and using the provided FREE tools. Visit our Bike Assembly page to see how you assemble your new bike once you receive it.

All bikes collected from our shop, are built, tested and ready to ride.

Please note, occasionally, manufacturers may change the specification without notice. Bicycles do not come with pedals unless otherwise specified. Bikes ordered for delivery will not arrive with the pedals installed, please refer to the owners manual and pedal installation guides provided for guidance or contact Customer Care. We do not install accessories to bikes, including mudguards.

Trek Domane SL 4 Disc Road Bike 2021 Sizing

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