B’TWIN 500

220 Triathlon Magazine - - BIKE COMPUTERS -

£19.99 It’s al­most heart-warm­ing to test a bike com­puter with­out GPS – even more so when it comes in at less than £20. There are no satel­lite cut-outs, no il­log­i­cal os­cil­la­tions in time, dis­tance and speed. In­stead, the B’Twin 500 uses what seems on the face of it a tra­di­tional mag­netic sen­sor. But it’s not. The en­try-level brand has clev­erly utilised a sen­sor that con­tains a gy­ro­scope, which works by strap­ping it to the hub of ei­ther your front or rear wheel. It then trans­mits to the unit ev­ery 3m. We tested its ac­cu­racy against our top-end Garmin 1030 (not tested here) and it matched im­pres­sively; in fact, it out­per­formed the Po­lar in ur­ban ar­eas. It also works on the turbo trainer – again a feather in its ac­cu­racy cap over many GPS mod­els. Of course, at this price the fea­ture list is nom­i­nal – speed and dis­tance – but cal­i­bra­tion is easy as it’s pre-pro­grammed with the most com­mon wheel sizes, in­clud­ing the triath­lete’s choice of 700c. The only real moot point is the back­light: it stays on for a blink of an eye. Longer would be bet­ter. de­cathlon.com

VER­DICT UN­DER £20 FOR A WIRE­LESS BIKE COM­PUTER? THIS IS IM­PRES­SIVE STUFF FROM B’TWIN

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