Chest strap heart rate monitors live or die by electrode contact. The Hammerhead Heart Rate Monitor addresses this fundamental challenge with conductive rubber electrodes featuring a patented honeycomb pattern that increases skin contact surface area while improving moisture drainage. This texture serves a dual purpose: it keeps the strap from riding up and down during hard efforts while maintaining consistent readings as sweat accumulates. The rubber material resists aging, temperature extremes, and oxidation, addressing the durability issues that plague fabric electrode straps over time.

Connectivity options cover the full range of cycling and training scenarios. Dual Bluetooth channels allow simultaneous pairing to two devices, useful when you want heart rate data on both your Karoo and a smartwatch or indoor trainer app. ANT+ connectivity handles the Karoo pairing with minimal battery drain and supports unlimited concurrent ANT+ receivers. The sensor transmits R-R interval data for heart rate variability analysis, making it compatible with training platforms that use HRV metrics for recovery and readiness assessments.

The two-piece design separates a 15-gram sensor pod from a 28-gram elastic strap, keeping total system weight at 43 grams. The strap adjusts from 28" to 48" to fit a wide range of chest sizes, and the elastic material stays in place once positioned. After rides, the sensor pod snaps out so you can machine wash the strap with your kit. The pod itself carries a 30-meter waterproof rating, handling sweat, rain, and the occasional creek crossing without issue.... Read More