Upgrade your Shimano 105 crankset with 4iiii’s most advanced power meter yet, the Precision 3+. Trusted by pros and everyday riders alike, it delivers industry-leading accuracy and reliability to help you train smarter and ride stronger. Whether you're chasing a Kona qualification, racking up indoor miles, or hunting local KOMs, the Precision 3+ provides the data you need to perform at your best.

With ±1% accuracy, auto terrain detection, up to 800 hours of battery life, and a 3-year warranty, it’s built to go the distance, season after season.

APPLE FIND MY

Offering complete peace of mind of always knowing where your power meter is.

AUTOMATIC TERRAIN SELECTOR

Detects the terrain you're riding on for more responsive cadence and power feedback/data. Ride the roads less travelled with confidence.

THREE-YEAR WARRANTY

A lot can happen in 3 years. You probably won't need to use it, but it's reassuring to know that all 4iii power meters are backed by an industry-leading 3-year warranty.

BATTERY LIFE

With up to 800 hours of battery life, you won’t have to worry about changing your battery for years to come.

LIGHT WEIGHT

At only 9 grams, the PRECISION 3+ Powermeter weighs about the same as a sip from your water bottle.

• Type: Non-drive-side
• Apple Find My: Yes
• Connectivity: ANT+ & Bluetooth Smart
• Accuracy (%): +/- 1
• Automatic Terrain Selector: Yes
• Cycling Metrics: Yes
• Battery: CR2032 coin cell
• Waterproof Rating: IPX7
• Cadence Range: 30-170 rpm
• Power Range (watts): 0-4000 
• Weight: 9 g
• Operating Temp. (°C): 0-50
• Storage Temp. (°C): -40-60 
• 3 Year Warranty