A don’t think arm length, or an extension on the wrench, will change the torque applied. It will only change the scale reading; and give you more leverage.

The other thing is there are tolerances where you could be off by 5% from one actual torque to the next without any changes in the settings.

I did a quick run with a luggage scale and it is interesting in that you have to catch the high reading, especially for wrench that releases at torque.

It is good to make sure the wrench isn’t off by 50%, especially if it is torquing higher than the setting. For a bike that is really all you need. Get within 10% and call it a day.

John