Hammerhead Karoo 3 – £30 off
Use the code SAVE30 to get £30 of a Hammerhead Karoo 3 (or any products exceeding £250 in value) at Tredz.
Karoo 3 is normally £450 and if you spend £50 more on something else you go over the £500 threshold and can then use the code SAVE55 to save £55.
enjoy!
Buy: Karoo 3 £420
More: Detailed Hammerhead Karoo 3 Review
Last Updated on 28 January 2026 by the5krunner
Small things I always use
Watches and sensors
On the bike
Home and indoor training
- NPE Runn: Makes my basic treadmill smart, sending more accurate speed and distance to my watch and Zwift. I use it.
- Google Wifi: Keeps Zwift connected in my pain cave. I use it.
- Apple TV 4K: Zwift on the big screen. I use two.
- Google Nest Doorbell (wired, 2nd gen): My video doorbell, running in both Google Home and Apple Home. I use it.
Health, recovery and sleep
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tfk is the founder and author of the5krunner, an independent endurance sports technology publication. With 20 years of hands-on testing of GPS watches and wearables, and competing in triathlons at an international age-group level, tfk provides in-depth expert analysis of fitness technology for serious athletes and endurance sport competitors. ID