 You don't need to be an 'investor' to invest in Singletrack: 6 days left: 95% of target - Find out more
I've always liked these Soulcraft [url= http://cgi.ebay.co.uk/SOULCRAFT-PLOWBOY-Singlespeed-FRAME-1600-Value_W0QQitemZ120373260232QQcmdZViewItemQQptZMountain_Bikes?hash=item120373260232&_trksid=p3286.m63.l1177 ]frames[/url] and luckily this one's too small for me.
Question is how are you supposed to tension the chain? Doesn't look like an EBB. I can only think it was designed to use a White Industries eccentric eno hub but that seems unlikely.
Only other thing I can think of is that it is designed to work with only 2:1 gear ratio (ie 32:16), but that seems just as unlikely as being ENO-specific. Unless someone just hacked off the mech hanger and cable guides and resprayed it.
I think JN may be right
Having lusted after one of these for a while (luckily it's too small for me too) I'm not even sure if they offer an ebb as an option but as a custom build I'm sure they will accommodate anything. This appears the only 'standard' option on their site
[img] 
[/img]
One ratio idea wouldn't account for chain wear though.
I guess it must be a geared bike that was hacked. Maybe the owner had a an eno hub.