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König's K-Summit is what we call a "Ladder track chain". It's fixed to a wheel bolt with a special adapter, winds on to the wheel when you start to move, places a ladder of chain around the face of the tyre, with no parts inside the wheel, and requires no additional tensioning. The external bracing mechanism, and the friction between the chain and the tyre, prevents it from coming off the wheel, especially during cornering.

The hardened steel traction plates incorporate specially shaped "ice breaker" ridges; the chain elements are made from case-hardened manganese nickel (MnNi) alloy steel to provide an optimum combination of strength and hardness.

Each K-Summit size comes as standard with adapters to fit 17mm, 19mm, 21mm and 22mm wheel bolts.

Because each K-Summit size fits a number of tyre sizes, some adjustment to the circumference of the ladder track is usually required first time out - this is easy to do, especially as K-Summits have a really clever spring loaded tensioning system.

A few turns of a spanner fits the adapter to the wheel bolt - a spanner with an insulated handle is supplied - and the rest is easy. There's a ratchet to take the strain and to make sure that the system is at an appropriate tension.

Removing the K-Summit is also quick, clean and easy - loosen off the ratchet and pull the chain off the tyre.

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