Joe
They all stretch. One thing we learned the hard way in our first race is that the chain must be checked/tightened every time before you go on the track.
There are some DHD? chains that are supposed to stretch less and be stonger, but I have not seen the difference for the price. Check your chain often, don’t over tighten it, and replace it on a regular basis (we go through 1 about every 4 races).
Duff