Let's offroad / mountain bike / mtb / ride dirt

Any of you guys using an EBB know how much teeth difference you can get away with without having to change the chain length? I'm currently running a 20T on the back and want to go down to a 17T, maybe lower if I can get away with it.

It should be possible, but will depend on the current EBB position. If it's at 9 o'clock then you shouldn't have a problem. I can use a 19T and 15T on the same chain. Your chainring size will also make a slight difference.

I might just be picky, but I can notice the different BB position relative to the saddle, and depending on the riding I'm doing I often have to adjust the saddle accordingly.