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The kart’s grip, influenced by both the tyres and the track surface, plays a key role in choosing the right gear ratio—one that makes full use of the engine’s torque and power.
Second episode of “Consigli degli Esperti”, a series offering practical guidance on how to select and optimise a kart’s transmission ratio (sprocket and pinion). Identifying a base ratio for a track is only the starting point—fine-tuning it properly takes method and close attention. Two factors in particular play a crucial role in this process: track grip and tyre type. These directly affect how well the kart holds the surface and how efficiently engine power is transferred—both of which influence how easily the engine operates within its best rev range, where torque and power are at their peak. As grip conditions change, it may become necessary to adjust the ratio to keep the engine performing in that ideal window for as long as possible. Helping us understand how to manage this is Michele Zampieri—driver, experienced mechanic and co-owner of CKR, an Italian manufacturer of racing chassis. After sharing his approach to selecting a starting ratio on a new circuit (for more on that, see: “Expert Advice | How to choose and optimise the gear wheel/sprocket ratio of the kart on a track you don't know”), in this second instalment he explains how to adapt the transmission to the current grip level and the tyres in use.