Packing a lot into a small body

Blackburn's Delphi 5 computer packs a lot of features into a small body. All of the usual...

Blackburn Delphi 5.0 review

Blackburn's Delphi 5 computer packs a lot of features into a small body. All of the usual cyclo-computer features are there such as distance, speed, average speed, time and maximum speed. A heart-rate monitor and cadence monitor are added bonuses. The real appeal for John Kenny was the ability to master all of these features quickly.

The Blackburn Delphi 5.0 is the second-from-top offering from the American manufacturer and offers all the usual bike computer functions: Current speed, maximum speed, distance, odometer, clock and stopwatch. It also packs in a heart-rate monitor and a cadence kit into its relatively small wireless body. The only feature missing from the Delphi 6.0 is an altimeter.

The Delphi advertising campaign features a chimpanzee, Mr Pickles, who is seemingly able to operate the computer with ease. The tagline is, "If Mr Pickles can work it out, you can." It's a cute campaign, but adds a bit of pressure to the learning process as well. Fortunately, the Delphi operating system is well thought out. Having a computer that is packed with features is of little use if you can't access them because the operation is unnecessarily complicated. There are four buttons on the Delphi, but out on the road you only really need to use two of them, the 'mode' and 'option' buttons.

Well thought-out operation

The 'option' button is the most useful button as it allows the user to cycle through information displaying average speed, distance, lap time, heart rate and clock. To get to maximum speed you need to use the 'mode' button when in average speed, which is one of the Delphi's few instances of needless complication.

The 'mode' button does most of the other useful work and provides further detail on a given option. For example, when heart rate is shown on the lower display window, the mode button cycles through maximum heart rate, time in zones and average heart rate. It's a straightforward concept and easy to learn. I basically ignored the other two buttons except when resetting the ride information and for turning on the backlight, incidentally a very handy function.

Three displays

The LCD screen features three layers of data. Current speed on displayed on top, followed by the ride chronograph, then the supplementary data such as distance. The bottom screen information is quite hard to read due to the small size, yet it is responsible for the vast majority of the information.

The middle screen with displaying the ride chronograph is a bit of a display hog. I would have happily have made this the smaller bottom display or even combined it will all the other features. I can't see why the chronograph is more important than distance travelled. It does have another use, however, which is to display the time accumulated in each target zones when the heart rate dynamic memory is displayed in the lower data window.

There is also a handy additional display that can be activated in the top right corner for heart rate and cadence. I found that I relied on this display when using the heart rate monitor, which gave me the option of viewing other variables without becoming distracted and allowing my heart rate to drop.

The heart rate monitor is an extremely useful training tool as it really helps to keep you honest. Some days you can be riding at 40kph without your heart rate breaking 100. It also greatly relieves the tedium of riding on a home trainer. The battery is also easily replaceable on the chest strap, which is not the case with all manufacturer's heart rate monitor straps.

Another useful feature is the two bike setting with individual and combined odometer. This provides the option of swapping the computer between bikes, which is especially useful if the bikes have different wheel sizes.

Fit kit

The sensor is robust enough to take a bit of punishment on the fork blade. It's inevitable the sensor will get knocked around when the front wheel is removed but there's enough plastic around the cable ties to stop it cracking easily.

The kit comes with two handlebar mounts. One has a wire that runs to the crank arm to measure cadence. One problem with the set up is the lack of security with which the handlebar mount holds the computer. On two occasions I pushed the computer off it's mounting onto the road when pressing one of the buttons. Remarkably the computer survived both falls virtually unscathed, but the computer should snap into its mounting more securely.

Wireless computers are generally a snap to set up. Computer goes on 'bars, sensor gets cable zip tied to fork and magnet attaches to spoke. Easy…. The complication comes for those with bladed spokes as the supplied wheel magnet won't fit. My magnet didn't seem to work that well, unfortunately. It seemed to miss a beat fairly regularly and current speed would drop. It didn't have a huge effect on total ride distance, but the bug deducted a couple of kilometres for every 100 or so. It also impacted slightly on average speed.

Luckily the bug was easily fixed. All it involved was a piece of counter-intuition - to move the sensor a little further from the magnet. Sean Coffey of Blackburn said, "Our sample batch had the sensitivity tweaked a little to work with the rare earth magnets we're using… we've now got it dialled in to work at a normal (say 1/8th to 1/4 of an inch [3-6mm]) distance."


At around US$80 the price seems more than fair, considering the features that are packed in for the price. Once the niggles were worked out, the Delphi was a simple and straightforward computer to use. I didn't have to continually refer to the manual to activate the features. The size of the really useful information is a little small to read when riding and I would have happily done away with the large and constantly running chronometer to allow more space for the other functions.

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