If you’re serious about improving your cycling—whether that’s getting faster on your commute, building fitness, or pushing further on weekend rides—there’s one upgrade that can make a real difference: a 4iiii power meter.
At Merlin Cycles, we believe in making high-performance cycling tech accessible to all riders. Power meters aren’t just for pros anymore—they’re for any cyclist who wants to train smarter, track real progress, and get more out of every pedal stroke.
Train Smarter, Not Harder
Speed and heart rate only tell part of the story. Power—measured in watts—is the most accurate indicator of your cycling effort. It’s unaffected by temperature, fatigue, or terrain, giving you a consistent measurement of how hard you’re working.
With a 4iiii power meter from Merlin Cycles, you can:
- Train within precise power zones tailored to your goals
- Improve your pacing on climbs, intervals or time trials
- Avoid burnout by managing your workload scientifically and accurately
When you train with power, you stop guessing and start improving.
Precision You Can Depend On
4iiii’s patented 3D strain gauge technology delivers accuracy within ±1%, giving you confidence that your data reflects your true effort. Every watt counts, and 4iiii ensures you capture them all.
That precision means you can:
- Benchmark your performance accurately
- See steady progress over weeks and months
- Fine-tune your training with hard data – not guesswork
It’s pro-level insight, made simple for everyday riders!
Lightweight, Durable & Ready to Ride
For cyclists who ride year-round, reliability matters. 4iiii power meters are:
- Ultra-light, adding only a few grams to your crank arm
- Weather-sealed, perfect for unpredictable UK rides
- ANT+ & Bluetooth compatible, working seamlessly with Garmin, Wahoo and popular training apps
Setup is quick and hassle-free—fit, pair, and ride. No complicated installs or tools needed.
A 4iiii Power Meter for Every Rider
At Merlin Cycles, we stock a complete range of 4iiii power meters to match your bike setup and budget:
- 4iiii Precision 3+ Power Meter (Shimano 105/R7000) – Lightweight, affordable, and perfect for single-sided measurement.
- 4iiii Precision 3+ Power Meter (Ultegra R8100) – Advanced accuracy and seamless integration for performance-focused riders.
- 4iiii Dual-Sided Power Meter – Full left/right balance data for riders chasing ultimate precision.
- 4iiii reCYCLED Powermeters – the same great 4iiii powermeters in a variety of versions at an incredible price!
Whether you’re upgrading your current setup or building a new bike, there’s a 4iiii model to fit your crankset and riding goals.
👉 Explore the full 4iiii range at Merlin Cycles
Track, Sync & Stay Motivated
Your 4iiii power meter connects effortlessly with Zwift, TrainerRoad, Strava, and Garmin Connect, making it easy to review your performance and progress. Watching your watts improve over time is one of the most rewarding parts of training—it’s tangible proof that your hard work is paying off.
4iiii reCYCLED Powermeters
Available exclusively to Merlin Cycles, the 4iiii reCYcled Powermeters provide an excellent opportunity to enter the world of training with a powermeter. All of the cranks are lightly used but are fully inspected and go through a strict quality control process at 4iiii in Canada. They are then fitted with a brand new powermeter pod and are ready to ride.
Backed up by the same industry-leading 3 Year Warranty, the 4iiii reCYCLED powermeters are only available whilst stocks last.
Examples of what the reCYCLED Cranks are like;
Why Choose Merlin Cycles?
Competitive UK pricing on all 4iiii models.
Fast, reliable shipping across the UK and beyond.
Expert advice from cyclists who understand real-world training.
Trusted by riders since 1993 — Merlin Cycles is one of the UK’s longest-established independent bike shops.
When you buy from Merlin Cycles, you’re not just getting great value—you’re getting expert support and genuine cyclist insight every step of the way.
Power Up Your Ride with 4iiii from Merlin Cycles
Ready to take control of your training? A 4iiii power meter gives you the tools to measure your effort, track progress, and ride smarter—whatever your cycling goals.
🚴 Shop the full range of 4iiii power meters at Merlin Cycles
