Boardman SLR 8.9 105 2025 - Road Bike











A carbon frameset with aero tube profiles, a smooth-riding carbon fork and Shimano 105 2x11 gearing give the SLR 8.9 105 a lively, efficient feel, balancing speed, comfort and control across everyday road miles.
Key Features:
- Full carbon frame with aero shaping and endurance-focused geometry
- Full carbon fork for stable handling and comfort
- Shimano 105 R7000 2x11 drivetrain for smooth, precise shifting
- Tektro R315 rim brakes with long-drop clearance
- Tubeless-ready alloy wheels with Vittoria Zaffiro Pro tyres
- Refined contact points for comfort and reduced drag
- Available with 0% APR finance
The SLR 8.9 105 builds on the popularity of the original SLR 8.9 Carbon, bringing together a lightweight carbon frameset, aerodynamic shaping and upgraded 11-speed Shimano 105 shifting. Designed using the same aerodynamic principles and geometry as the flagship SLR 9.6, the frame delivers a blend of speed, comfort and efficiency suited to a wide range of road riding.
The carbon frame uses dropped seat stays, an integrated seat clamp and aero-optimised tube shapes developed through wind tunnel testing. These details help reduce drag while maintaining a comfortable, stable ride feel on longer outings. The carbon lay-up is tuned to offer stiffness where it supports power transfer, while absorbing road buzz to help reduce fatigue. The endurance-influenced geometry strikes a balance between an efficient riding position and everyday comfort, making the bike suitable for long training rides, steady group rides and weekend loops. Clearance for 28mm tyres and hidden mudguard mounts add welcome versatility.
Shimano's R7000 105 groupset is a key improvement over previous versions of the bike. With 2x11 gearing, improved ergonomics and smoother shifting, it brings technology inspired by Shimano’s higher-tier groupsets. The compact 50/34 chainset paired with the 11–30 cassette offers a broad spread of gears, helping you spin up climbs while keeping enough top end for faster sections. Shimano 105 levers pair with Tektro R315 long-drop rim brakes, offering balanced stopping power and space for larger tyres or a mudguard setup.
The bike rolls on tubeless-ready alloy rims, providing an easy path to a tubeless upgrade for riders seeking extra comfort and puncture protection. Vittoria Zaffiro Pro tyres offer reliable grip and low rolling resistance, well suited to year-round training and varied road conditions.
Contact points have been refined using rider data and real-world testing led by Chris Boardman. The updated saddle, shorter crank lengths and practical bar widths support a comfortable and efficient position, while helping to reduce frontal area for improved aerodynamics.
Light, responsive and confidence inspiring, the SLR 8.9 105 is a great choice for riders stepping up to carbon, building fitness or wanting a fast, capable bike for regular road miles.
Occasionally, without notice, manufacturers change product design and/or specifications.
| Frame | Full carbon, B/C Grade, endurance geometry |
| Fork | Full Carbon Fork |
| Headset | FSA Orbit C-40 ACB, tapered & integrated |
| Stem | Alloy, 120mm, 7 degree rise, 31.8mm clamp |
| Front Brake | Tektro R-315 Brakes |
| Rear Brake | Tektro R-315 Brakes |
| Brake Lever | Shimano 105 |
| Front Mech | Shimano 105, FD-R7000, 11-SPD Double |
| Rear Mech | Shimano 105, RD-R7000SS |
| Shifters | Shimano 105 |
| Speed | 22 |
| Rims | Alloy double wall, front 24h, rear 28h, tubeless ready |
| Front Hub | Alloy, Black, 9mm Q/R |
| Rear Hub | Alloy, black, 10mm QR |
| Front Tyre | Vittoria Zaffiro Pro 700cx25 tyres |
| Rear Tyre | Vittoria Zaffiro Pro 700cx25 tyres |
| Seat Post | Boardman alloy, 27.2x350mm |
| Saddle | Boardman |
| Chainset | FSA Gossamer 50/34 Chainset |
| Bottom Bracket | FSA pressfit 86.5mm |
| Chain | KMC, X11, 11 Speed |
| Cassette | 11-30 Cassette |
| Pedals | Resin Platform |
| Weight | 9kg |
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Boardman SLR 2025 Size Chart
|
Size |
Height (cm) |
Height (inches) |
Inside Leg (cm) |
|
S |
170 – 179 |
5’6” – 5’10” |
74 – 82 |
|
M |
177 – 183 |
5’9” – 6’0” |
78 – 85 |
|
L |
181 – 189 |
5’11” – 6’2” |
82 – 89 |
|
XL |
187 - 195 |
6’1” – 6’5” |
86 - 94 |
What size frame do I need if I am between sizes? - read here
Boardman SLR 2025 Geometry Chart
| Size | XS | S | M | L | XL |
|---|---|---|---|---|---|
| Stack | 537 | 548 | 563 | 577 | 593 |
| Reach | 371 | 378 | 388 | 394 | 404 |
| Head Tube Length | 126 | 138 | 151 | 166 | 183 |
| Head Tube Angle | 71° | 72° | 72.5° | 72.5° | 72.5° |
| Bottom Bracket Drop | 74 | 70 | 70 | 70 | 70 |
| Chainstay Length | 410 | 410 | 412 | 412 | 412 |
| Top Tube Length (horizontal) | 525 | 540 | 555 | 570 | 585 |
| Seat Tube Length | 465 | 485 | 500 | 525 | 545 |
| Seat Tube Angle | 74° | 73.5° | 73.5° | 73° | 73° |
| Crank Length | 165 | 170 | 170 | 172.5 | 172.5 |
| Stem Length | 80 | 90 | 100 | 110 | 120 |
| Handlebar Width | 380 | 380 | 400 | 400 | 420 |
All measurements are in mm unless otherwise stated.
The above table shows the standard geometry for the bicycle as shipped, other geometry configurations may be available with certain bikes. Please contact us via Live Chat to find out more.
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Boardman SLR 8.9 105 2025 - Road Bike
From my limited experience it is a lovely bike. Very light. good gears and brakes. Comfy saddle and handlebars. Luckily Tredz sent a multitool which I've had to use on a couple of long rides. The front deraileur needed adjusting - I don't think it likes bumpy fen roads and the seat started moving.
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