The narrow wide tooth pattern keeps.
Chain guide 3 ring.
As mentioned above some set ups may not.
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Choose a chain guide.
Put simply the teeth are correspondingly thick then thin resulting in a profile which grips to the chain and aids chain retention.
It is always defined in millimeters.
As you ride over rugged terrain your chain moves around quite a lot.
What does the narrow wide tooth pattern do.
The narrow wide chainring now mates seamlessly with the chain almost locking the chain to the ring without much increase in drag.
The sole purpose of the narrow wide chainring is chain retention.
Often to the point where many riders no longer feel the need to run a front chain guide.
Clutch type rear derailleurs like this xtr shadow plus help keep the chain from coming off the bottom of the chain ring bikeradar.
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