WHY CHOOSE 165 MM CRANKSETS?
165 mm crank arms improve cadence, reduce knee stress, optimize aerodynamics, and provide greater safety on technical terrain. They are particularly suited for riders between 1m65 and 1m80, especially when paired with well-spaced 12-speed gearing. Their growing use in road racing, triathlon, gravel, and track sprinting confirms their versatility.
Riding with 165 mm crank arms makes it easier to maintain a high cadence and smooth pedalling. The reduced range of motion lessens muscle fatigue and protects the joints, while improving aerodynamic positioning.
- Increased cadence: ≈ +1 rpm per mm shorter crank length.
- Reduced fatigue: greater comfort on long rides.
- More aero position: smaller torso–thigh angle, ideal for TT/triathlon.
- Weight savings: 1 to 3 g saved per mm less crank length.
- Safety: better ground clearance in corners and technical terrain.
| Discipline | Benefit |
|---|---|
| Climber | Higher cadence on climbs, delays fatigue on steep ascents and sportives. |
| Time trialist | Very useful at threshold on flat; effective for ~10 km solo efforts (cadence + aero). Less obvious otherwise. |
| Sprinter | Track cycling standard; boosts cadence in the final 100 m. |
| Triathlon | Widely used; enables a more aero and efficient position. Sometimes even shorter than 165 mm. |
| Gravel | Helps tackle steep ramps at high cadence, especially with modern wide-range gearing. |
| Height | Recommendation |
|---|---|
| 1m65 – 1m75 | Ideal range for 165 mm crank arms. |
| 1m75 – 1m80 | May benefit from higher cadence, depending on discipline and goals. (e.g., Pogacar: 1m76.) |
| > 1m80 | Less common; reserved for specific cadence/aero goals. Inseam length is the main factor. |
| Reason | % of purchases |
|---|---|
| New bike: no suitable crank length option available | 30 % |
| Trend/fashion | 25 % |
| Aerodynamics (often triathletes) | 20 % |
| Bike fit study | 15 % |
| Previously tested and wanted on current bike | 5 % |
| Injury-related | 5 % |
VELO-PERSO.COM'S OPINION
The rise of 12-speed gearing makes 165 mm crank arms highly relevant: they require smaller, well-spaced gear ratios to remain comfortable and efficient. On older 8-speed bikes, it's more challenging due to less flexible gearing. 165 mm generally increases average cadence, so adjust your gearing accordingly.
165 MM CRANKSETS: VELO-PERSO EXPERTISE
Switching to 165 mm cranks isn't just about size; it's a biomechanical optimization. By reducing the pedaling circle, you open up the hip angle and optimize your torque. Contrary to popular belief, power does not drop: it becomes more sustainable thanks to increased cadence.
| Adjustment | Recommended Change | The Benefit |
|---|---|---|
| Saddle Height | +5 mm (theoretical) | Compensates for the higher position at Bottom Dead Center. Note: 2 to 3 mm is often enough. |
| Handlebar Height | +5 mm (keep the same drop) | Maintains your aero balance after raising the saddle. |
| Knee Strain | Immediate Relief | The smaller circle limits extreme knee flexion at Top Dead Center (TDC). |
| Profile | Velo-Perso Recommendation |
|---|---|
| Up to 1m80 (5'11") | Suitable for all. The new standard for optimizing efficiency. |
| Inseam < 90 cm | Primary Target. Immediate gain in comfort and leg speed. |
| Inseam > 90 cm | Caution. We suggest 170 mm or 172.5 mm to respect your natural leverage. |
Most bikes are delivered with cranks that are too long. Replacing an entire groupset is costly and frustrating.
- Rotor Modularity: Change crank length without replacing the whole crankset.
- Micro-Compact (48/31): Perfect for 165 mm to maintain high cadence on steep climbs.
- Weight Savings: Our Aldhu Carbon solutions are significantly lighter than stock OEM parts.
EXPERT VERDICT
"Switching to 165 mm is the most underrated modification to improve endurance. With 12-speed groupsets and proper gearing, you won't 'spin out': you smooth out your effort. It's the end of joint tension peaks and the beginning of a more fluid, sustainable stroke."
— Team Velo-Perso.com
