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Hammerhead

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Answer a few short questions and we'll make a recommendation on which size is best for you.

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Step 1: Measure your height

  • Take off your shoes
  • Stand with your back straight against a wall
  • Balance a book on your head to mark your height on the wall
  • Measure your height by the distance from the floor to the mark
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Step 2: Adjust your inseam

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  • You can measure your inseam by tucking a book between your legs so there is pressure but it isn’t uncomfortable.
  • Inseam typically falls with 5cm of the average.
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Shop Hammerhead

Hammerhead makes GPS bike computers designed for riders who want clean, confident technology without fluff. Every Karoo device is built to make navigation, training and connectivity feel intuitive and reliable. When it comes to screens that stay sharp in sun or rain, battery that goes the distance, and gear compatibility that’s seamless, Hammerhead delivers.

The Hammerhead Story

Hammerhead began with a vision of reimagining how riders interact with cycling technology. Early products focused on simple, inventive tools for navigation, and were followed by the Karoo line, which brought touchscreen GPS devices with training, mapping and ride-sharing functionality built in from the handlebar.

SRAM acquired Hammerhead in January 2022, enabling deeper investment in hardware innovation, tighter integration with drivetrains, and expanded mapping and training ecosystems. Riders benefit today through faster updates, broader compatibility with components, more accurate global satellite tracking and improved durability.

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Why Ride Hammerhead?

  • Industry-leading navigation quality. Karoo supports multi-band GNSS and integrates global satellite systems to keep your route accurate through city canyons, dense forests and remote trails.
  • Strong connectivity with components. Your Hammerhead works with heart rate monitors, power meters, connected lights, SRAM’s wireless shifting, electronic groupsets, and even electric-bike data fields.
  • Rugged, weather-resistant build. Devices are sealed to IP67 waterproofing standards with durable glass and reinforced shells that resist impacts, vibration and environmental stress.
  • Long battery life and regular updates. Each device offers many hours of ride time, fast charging, and firmware pushed over-the-air so your computer improves as you ride.

Popular Hammerhead Ranges Explained

Hammerhead Karoo

The Karoo line are GPS cycling computers designed for riders who want advanced maps, strong component support and reliable performance. They offer multi-satellite navigation, side buttons for control in wet or muddy conditions, and enough memory to store many maps and workouts. Designed to integrate with your existing gear, they are especially good at pairing with cranksets, electronic shifting and electric-bike systems.