I'm in the process of building a SS/fixed bike utilizing the ENO rear hub. How much of a difference in teeth between the freewheel and cog will the hub compensate for?

Thanks.

About one link.
For an example from 14 to 18 in rear cog size.

It accommodates 4 teeth if you happen to start at one end of the eccentric travel and finish at the other. However, it's pretty much pure luck if your chain length happens to work that way. I'd generally work on the assumption that you can manage a two-tooth spread on the rear (e.g., 16+18). I set up a couple friends with Eno hubs and we experimented with how much gearing range we could manage. Only on one bike did we have the chainstay length that gave us a 3-tooth range or more. If you want to play around with half-links you can increase the range (if you aren't lucky to begin with), but a two-tooth spread on the rear is actually quite a lot of gearing range.

Another option is to split the difference on chainline and run with two chainrings. You can establish a pretty wide gear ratio difference with the same (or similar chainlength). Just finished setting this up on a MTB with 32x18 and 36x13. Got me a wikked split for trail riding and riding to the trail, just planned to have the best chainline in the most critical situation (inside ring, more likely to catch and derail than the outside).
+3mm and -2mm is not too bad.

Just an idea if you're looking for a wider range. You may find that, depending on chainstay length and gear choice you may not have much range of motion left in the eno otherwise.

And then the chain will stretch anyway...

I have just finished building a bike with the ENO hub. I am using a 16t Dura Ace cog on the fixed side and a 17/19t ENO DOS freewheel on the other side. All three can be used with the same chain length. I believe there is room for one more tooth... so a total of four teeth is about the limit.

Thanks for the info.