Why buy your bike from Sigma Sports?
Don't hesitate to reach out to us. It's our goal to answer all of your questions and offer the best advice from our experts. We’ll be happy to answer any questions you may have. Contact us now or visit us in-store.
All our bikes are fully built by our Cytech qualified mechanics. To find out more, see the Built, Checked, Tuned and Tested section below to see how we'll deliver your bike.
We offer FREE DELIVERY of your bike to your home or place of work. Once you've placed your order, our Customer Care team will be in contact to offer a convenient delivery date of your choice.
We've partnered with Pedalsure to offer you 30-DAYS FREE bike insurance on new bikes over £400. Visit our Cycle Insurance page to learn more and claim.
Trek Domane AL 4 Disc Road Bike 2021
With the Trek Domane AL 4 Disc Road Bike you get the best of both - comfort and speed. It uses an Endurance Geometry so you can ride hour after hour without aches and pains, and it makes an extremely versatile all-rounder for long rides and training thanks to the combination of an alloy frame, carbon fork, reliable components and clearance for wider 38mm tyres. Key to the bump-smoothing comfort is the carbon fork featuring IsoSpeed technology, soaking up impact and taking the harshness out of the poorest roads and even gravel surfaces.
A Shimano Tiagra 10-speed groupset hits the middle ground between performance and reliability and the compact chainset and wide-ranging 10-32 cassette brings plenty of range for steep hills and fast descents alike. Hydraulic disc brakes are confidence-inspiring, as effective in wet conditions as they are in the dry, so you'll always be able to stop fast when required. The combination of Bontrager wheels and tyres can be set up tubeless if you wish to benefit from even smoother rolling plus better protection against punctures.
Highlights
- Trek 100 Series Alpha Aluminium frame with hidden cables
- The unique IsoSpeed Carbon fork, which swoops forward toward the dropouts, absorbs vibrations from the road so your arms won't fatigue as quickly
- Endurance Geometry
- Setting your wheels up as tubeless reduces the overall weight of your bike and the chance you’ll get a flat
- Bigger tyre clearance (up to 38c) lets you run wider tyres for more traction and stability on trails and other light gravel roads
- DuoTrap S compatibility makes it easy to wirelessly track your rides, so you can set goals and watch yourself reach them
- Shimano Tiagra 10-speed compact drivetrain
- Shimano Tiagra hydraulic disc brakes
Technical Specification
| Frame | Trek 100 Series Alpha Aluminium, tapered head tube, internal routing, mudguard mounts, DuoTrap S compatible, flat mount disc, 142x12 thru-axle |
| Fork | Trek Domane AL carbon, tapered alloy 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 | Shimano RS500, 68mm, threaded external |
| Stem | Bontrager Elite, 31.8mm, Blendr compatible, 7-degree |
| Handlebar | Bontrager Comp VR-C, alloy 31.8mm, 100mm reach, 124mm drop |
| Bar Tape | Bontrager Supertack Perf |
| Front Brake | Shimano Tiagra hydraulic disc |
| Rear Brake | Shimano Tiagra hydraulic disc |
| Brake Levers | Shimano Tiagra R4725 |
| Front Derailleur | Shimano Tiagra 4700, 31.8mm clamp |
| Rear Derailleur | Shimano Tiagra 4700, long cage, 34T maximum cog, 10-speed |
| Shift Levers | Shimano Tiagra R4725, 10-speed |
| Chain | Shimano Tiagra HG54, 10-speed |
| Cassette | Shimano HG500, 11-32, 10-speed |
| Crankset | Shimano Tiagra 4700, 50/34 (compact) |
| Front Wheel | Formula RX-512 alloy, 6-bolt, 100x12mm thru-axle hub / Bontrager Affinity Disc, tubeless-ready, 24-hole, 21mm width, Presta valve rim |
| Rear Wheel | Formula RX-142 alloy, 6-bolt, Shimano 11-speed freehub, 142x12mm thru-axle / Bontrager Affinity Disc, tubeless-ready, 24-hole, 21mm width, Presta valve rim |
| Front Tyre | Bontrager R1 Hard-Case Lite, wire bead, 60 TPI, 700x32c, clincher |
| Rear Tyre | Bontrager R1 Hard-Case Lite, wire bead, 60 TPI, 700x32c, clincher |
| Saddle | Bontrager P3 Verse, steel rails, 145mm width |
| Seatpost | Bontrager alloy, 27.2mm, 8mm offset |
| Pedals | Available to be purchased separately |
| Manufacturer Claimed Weight | 10.48kg / 22.55lbs (size 56) |
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. We do not install accessories to bikes, including mudguards. Bikes ordered for delivery that have tubeless compatible tyres and rims will arrive with inner tubes installed or with tubeless valves installed, this will be brand dependent. Sealant is available to be purchased separately.
If you require any assistance please contact our Customer Care team.