My guess is that you can get away without cold setting the rear triangle. I have done this a few times with no issues, however...
This usually works OK with a bike designed/built to accept a six cog freewheel, not five or less. If the bike starts with a five cog freewheel, the rear drop space will be 120mm. If that is the case, cold set away because, even though a strong person might be able to install the wheel, it will be difficult to do so.
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