We're used to seeing runners strap on watches, but now the best cycling watches and trackers will keep tabs on distance, pace and even cadence.
The data means cyclists can enjoy unprecedented insights into their performance and technique, becoming better cyclists in the process.
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Forget the old bike computers you used to strap to your handle bars. There's now a plethora of top wearables, from augmented reality glasses to GPS watches and everything in between.
Read on for our pick of the best cycling wearables....
Garmin Varia Lights
Related to the Edge 1000 are Garmin's super safe, super smart Varia Lights. The rear light scans up to 140 metres of the road behind you, alerting you to pesky tailgaters so you can take immediate action - usually with a middle finger and some choice swear words.
The front light, meanwhile, lights up the road in your immediate vicinity when you're going slowly, and illuminates further ahead at greater speeds. Connect both to the Edge 1000 and they'll automatically adjust to lighting conditions - perfect at this time of year, when it seems to get dark just after breakfast.
Dubbed Fitbit's ultimate tracker, it's no surprise that the Surge includes monitoring for your two-wheeled escapades. A GPS chip allows you to upload your rides to online services such as Strava, while a heart-rate sensor lets you know when you're in the zone.
It may not be as accurate as similar devices, but the fact that it ties into the Fitbit ecosystem combined with its high-stamina battery life makes it great for casual cyclists.
Cadence - the number of rotations the pedals make in a minute - is an essential metric for cyclists who want to maximise their speed. Moov's tracker uniquely straps to your ankle so it can record your RPMs, and it even includes a power estimate for more in-depth analysis.
Smarter still is the fact that it provides live coaching, letting you know when to change up a gear to eke a little more power out of your colossal thighs, or to shift down as you approach a super steep incline.
Garmin Edge Explore 1000
Pack your panniers and pedal off for a day in the great outdoors with Garmin's Edge Explore 1000. Set your ideal distance and it'll plan a route for you via its built-in maps, and when you feel like a drink break it'll locate your nearest pub.
Smartphone connectivity means you can see all the emails and texts you're ignoring while you enjoy the undulating countryside, and there's ANT+ for connecting heart rate and cadence sensors. It's the perfect cycling companion - and it won't moan when you hit the next hill.
PowerTap Power Meters
Yes, your average power meter will set you back far more than most people are willing to spend on a bicycle, but it measures a vital statistic: watts. Analysing this tangible unit is the way the pros improve their performance.
The disadvantage is that power meters are pricey thanks to the sensitive nature of the parts involved, and they need to be added to your bike's most intricate components, such as the rear wheel's hub. Easily-installable pedal power meters are also available - but they'll set you back just short of a grand.
Polar RC3 GPS
Being able to see your heart rate while you're cycling is essential if you want to push yourself out of pootling and into powerful pedaling. The RC3 does just that - giving you a constant overview of your current beats-per-minute - as well as GPS to record your routes and speed. Once you get home you can plug it into your computer to review your route complete with feedback on your performance.
Cycliq Fly6 and Fly12
The modern bicycle boasts more lights and cameras than a Hollywood movie shoot, so combining two into one is a beautifully efficient idea. The Fly6 rear camera combines a 30 lumen rear light with a 720p action camera, alerting good drivers to your presence and capturing the bad ones on video.
Coming soon is the front-mounted Fly12, which ups the video to 1080p and the lumens to 400, while chucking smartphone connectivity into the bag. Both boast six hours of battery life, which is impressive given their multitasking madness.
Most non-GPS wearables attach to your wrist, which is great if you're running, but not so hot when you're cycling. The Fly Fit is strapped to your ankle, which means that it is able to detect pedalling motions and work out your distance, speed and rotations per minute. As an added bonus it'll stop your jeans getting snagged in your chain, too.
ICEdot Crash Sensor
Strap the ICEdot onto your helmet, fire up the app, enter your emergency contact details and in the event of an impact the gizmo will call your loved ones and send GPS coordinates so help can be sent. You needn't worry about a Sea King turning up when you drop your helmet - the device gives you a countdown to cancel the emergency call.
EE Capture Cam
EE's action cam is one of the first we've seen that doesn't look like a child's plaything, looking lovely and retro with its pinhole camera look and feel. It's got a neat trick up its sleeve, too, in the form of 4G compatibility so you can livestream footage over cellular networks via the Periscope-esque Skeegle.
EE may have business users in their sights with the Capture Cam, but weatherproofing and GoPro bracket compatibility make this perfect for streaming your two-wheeled adventures to an audience of billions. Or just your mum.
From £10 a month (Contract)/£130 (PAYG), ee.co.uk
Recon Jet Heads-up Display
These heads-up sunglasses could turn out to be the most exciting innovation in cycling technology since the humble derailleur. The Recon Jet offers all the functions of a standard bike computer but instead of having to look down at a tiny LCD screen – the rider looks ahead and views a range of juicy stats on a heads-up display. This cool slice of tech syncs to third party heart rate monitors, power meters and cadence sensors via Bluetooth, ANT+ and Wi-Fi. It also pairs to any iOS and Android device for SMS, call display and internet access.
Aside from the usual suspects like top speed, average speed, etc, the Recon Jet also displays a GPS map of the route ahead and handy extras like elevation, power output in watts, heart rate, even the weather forecast. Regular Tour de Francer George Hincapie wears them, wouldn't you know.
Lazer Genesis LifeBEAM helmet
This pulse rate and calorie measuring system does away with a tight chest strap and integrates the sensor into the headband of a crash helmet instead; a neat idea given that you'll likely be wearing a helmet anyway. Unlike so many monitors, the bio-sensing LifeBEAM doesn't feature its own dedicated app. Instead, it connects via Bluetooth 4.0 to a small range of existing activity applications (five, to be precise) and an impressive 237 ANT+-enabled fitness devices.
The interface is simple, too. There's a button on the back of the helmet. Push the button. That's it. An LED flashes and an alarm sounds to tell you it's armed. Now go get on your bike and ride for England. But don't forget your helmet!
If you're into off-piste mountain biking, consider this stylish waterproof watch designed for cyclists, swimmers, cross-country runners and ramblers. The cycling mode provides real-time stats on pulse rate, speed, barometric pressure (with storm alarm), temperature, compass heading, altitude and distance covered, while its GPS receiver cleverly guides the rider home via a simple bread-crumb graphic.
It's easily customised too. Simply plug the watch into a PC or Mac and visit Suunto's online App Zone where you can download a selection of ready-made apps or create your own. The Suunto runs for around 15 hours on a single USB charge.
One of the most annoying things about action cameras is having to scrub through hours of footage to find that bit where you bunny hopped from an aeroplane to the lip of an active volcano. TomTom's Bandit solves this with GPS and accelerometer chips, which automatically tag moments of speed and inertia.
It also acts as a media server so you can edit and upload clips from your smartphone, and its all-in-one removable battery/memory card is so smart we don't know why it hasn't been done before.
Ever found yourself turning your phone upside-down at a junction, trying to figure out just which bloody way you're facing? BeeLine's ultra-simple navigational aid could be the answer to your geospatial woes. It links to Google Maps on your Android or iOS smartphone, and then points an arrow straight at your destination.
While it doesn't offer turn-by-turn directions, the designers reckon the compass-like pointer actually makes navigation a lot easier. And thanks to its e-ink screen this cheap, small device will last months between charges.
£45, beeline.co (pre-order)
Polar V650 Bike Pooter
Polar may be best known for its sports tracking watches, but with the V650 it admirably makes the leap into fully-featured bike computers. Slap it on your bike and it'll record your ride, show your stats and offer training tips. Bluetooth connectivity allows it to monitor speed, cadence and heart rate sensors, while a barometric altitude sensor lets you know why you're so out of breath in feet and inches.