Two issues:
First: What were the sizes of sprocket you ran in Cadets and what sprockets do you expect to run in TKM?
If the sprockets in TKM are bigger then you are more likely to make contact with the ground.
Second: Do you expect to go faster in TKM and possibly take more kerb?
The force affecting the sprocket at impact is dependent on the mass of the kart and the velocity. The kart will be a minimum of 18 kg heavier (unless you driver was overweight as a cadet) and averaging another 5MPH faster. (Four seconds a lap quicker at Clay)
When you do hit the sprocket it will be under greater load and more liable to be damaged.
You don't 'need' a sprocket protector, but it will save a lot of damage. However, having a sprocket protector encourages people to take more risks on the kerbs.
But at £5 for an HDPE sprocket protector, an insurance worth taking, no?
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