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.
Save up to 47% with any one of our 11 Cycle to Work partners, and get the health benefits of a new bike in exchange for tax free salary sacrifice. To find out more about our various partners and how to apply click here.
Choose between Free Bike Delivery - to your home or place of work - or our new Premier Bike Delivery Service £99.99 and have your bike delivered "ready to ride" and set up to your measurements with seatpost and pedals adjusted on arrival by a qualified bike mechanic. Either way, our Customer Care team will be in touch to arrange a delivery date to suit you.
We've partnered with Laka to offer you 30 days free bike Insurance on your new bike purchase over £400. Click here for more info and find out how to claim.
BMC Roadmachine Four 105 Disc Road Bike 2021
Granting versatility, comfort and speed, the BMC Roadmachine Four 105 Disc Road Bike is a solid choice for riding the longest of Gran Fondos, tackling the roughest roads and charging along in the local chain-gang.
The frameset boasts a laterally stiff but light carbon construction that surges up climbs and punches through sprints. This efficiency is complemented by the seatstays, fork and seatpost that have Tuned Compliance Concept carbon layup schedules to result in plush levels of comfort across the most broken of surfaces. Despite being a quick racing bike, an endurance-inspired geometry blesses the Roadmachine and places the rider in an ideal position for even the longest of days in the mountains.
Tyre clearance for up to 33mm wide tyres allows broader, quicker and more cushioned rubber to be used while the Mavic Open wheelset is light and strong for a reactive but assured ride experience. Stopping accurately and with composure, in any weather conditions is no problem for the Shimano Ultegra hydraulic disc brakes. The matching Ultegra gear setup flicks through its ratios with precision to find the perfect cadence no matter the topography.
Highlights
- A high performing endurance inspired bike that blends sublime levels of comfort with speed to become a true all-round performer across any road terrain
- The full carbon frameset is light but laterally stiff for efficient power transfer
- The frame’s seatstays, the carbon fork and the carbon seatpost are manipulated by BMC’s Tuned Compliance Concept to afford rough road cushioning without sacrificing power transfer
- An endurance inspired geometry is slightly shorter and higher to lower fatigue on long rides and has a longer wheelbase for more composed handling
- Tyre clearance for up to 33mm gives the potential of lower rolling resistance and increased comfort
- Mavic Open Disc wheelset is light but robust
- Shimano 105 gears shift with accuracy and dependability
- Shimano 105 hydraulic disc brakes stop flawlessly in all conditions
Technical Specification
| Frame | BMC Roadmachine Premium Carbon - TCC Endurance compliance level, ICS technology, internal cable routing, PF86 bottom bracket, 12x142mm thru-axle |
| Fork | BMC Roadmachine 01 Premium Carbon - TCC Endurance compliance level, ICS Technology, internal cable routing, 12x100mm thru-axle, 50mm offset (Size 47-51), 45mm offset (Size 54-61) |
| Stem | BMC RSM01 with computer and camera mount |
| Handlebar | BMC RAB 02, ergo top shape, compact bend |
| Bar Tape | BMC black |
| Front Brake | Shimano 105 R7070 with SM-RT70 160mm rotor |
| Rear Brake | Shimano 105 R7070 with SM-RT70 160mm rotor |
| Brake Levers | Shimano 105 R7020, hydraulic |
| Front Derailleur | Shimano 105 R7000 |
| Rear Derailleur | Shimano 105 R7000, 11-speed |
| Shift Levers | Shimano 105 R7020, 11-speed |
| Chain | Shimano 105 CN-HG601, 11-speed |
| Cassette | Shimano 105 R7000, 11-32T, 11-speed |
| Crankset | Shimano 105 R7000, 50-34 chainrings |
| Front Wheel | Mavic Open Disc with CL-712 hub, 12x100mm thru-axle compatible |
| Rear Wheel | Mavic Open Disc with RXC-1425 hub, 12x142mm thru-axle compatible |
| Front Tyre | Vittoria Rubino, 700x28mm, clincher |
| Rear Tyre | Vittoria Rubino, 700x28mm, clincher |
| Saddle | Fizik Taiga |
| Seatpost | BMC 01 Premium Carbon D-Shape, 15mm offset |
| Pedals | Available to be purchased separately |
| Claimed Manufacturers Weight | 8.3kg / 18.29lbs (size 51) |
| Accessory | Integrated computer mount |
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. For hassle-free home delivery and bike set-up from a qualified mechanic use our Premier Delivery Service.
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.
Unable to display Reviews due to Privacy Settings.
Adjust your Cookie Preferences to Opt-in "YES" to "Functional Cookies".
Unable to display Q&A due to Privacy Settings.
Adjust your Cookie Preferences to Opt-in "YES" to "Functional Cookies".