These are top of the range bits of kit from the big manufacturers such as Campagnolo EPS, SRAM eTap, and Shimano Di2. Either way, “trimming” is an important skill to have when you access the gears in the extremes of your bike’s range. Check the spec's of your bike's brand and model front shifter and derailleur to determine if it uses trim. The feature set of both the One and the Trimm Cycling app are also limited compared to the (cheaper) competition.

You could determine this number by multiplying the number of cogs in your cassette (rear gears) by the number of chain rings (front gears) your bike has.

Playframes and Play Towers work around a square or a rectangle shape, allowing children to work around, rather than along the equipment. With the chain in the smallest cog on the cassette, it should be as close to the outer plate of the front derailleur without touching. Trimm claims this accessory alone helps extend the battery life to 30 hours, or up to 50 hours when the One is also paired to a smartphone. He is obsessed with keeping up to date with all the latest tech, is fixated with the smallest details and is known for his unique opinions. This indicates that if there’s enough sunlight the solar panel can genuinely keep the Trimm One charged during normal use.

Additionally, the chain could slip or cause the front derailleur to make noise and not work properly. After one firmware update I also had to go through the process of syncing the One with my smartphone again, setting up the data pages and reconnecting all of my external devices from scratch. Your goal while riding should be to keep a cadence (the speed at which your pedals make a full rotation) that as consistent as possible! Twisting the dial forward will move the chain into a smaller, harder gear in the rear (right hand) and a smaller, easier gear in the front (left hand). There is more of a gentle gradient between lowest and highest for complete novices or those rehabbing injuries.

As well as the speed sensor and solar charging panel, Trimm ships the One with a couple of other accessories in the box. So, the emphasis here is on the ease of use with the adjustable pedals and the portability of the lightweight machine. There’s not much point being able to connect a power meter if you’re only getting 50 per cent of the data.

With gears, you're able to choose how your pedaling work - speed (cadence) and pressure (power) - is used to propel the bike forward. I’m currently at 62% on the challenge… did 2,200ft in one ride yesterday and my % didn’t change – still showing 62% complete…. The problem with this being such a low-end beginner model is that this affects the stability and the intensity of the machine.The app, which uses OpenStreetMap maps on the ‘Ride’ page and Google Maps on the ‘Plan’ page, then calculates what it believes to be the optimum route between each point. Keeping pressure on the cable, wind out the screw a half turn at a time until the chain jumps to the biggest ring. The trim function is essentially a ‘microshift’ or 'half-shift' - it moves the front mech ever so slightly without moving the chain off the chainring like a full or regular shift.

Riding with the speed sensor, solar panel and a smartphone connected, the Trimm stayed at 100 per cent charge for the first half of a sunny, spring ride (until I had a problem with the out-front mount and had to put the whole setup in my pockets – more on that later). The second and arguably more interesting accessory is a small solar charging panel, which can charge the One as your ride. The first is an external speed sensor, which mounts to a hub and uses accelerometers to measure the speed at which you’re travelling.

Trimm says it has put a lot of effort into the navigation functionality, saying it wanted the One to be as good as Google Maps is for cars, but for bikes. Finally, we’ll set the high limit of the front derailleur, which stops the chain from overshifting off the chainring.