Headgardener said:
I think you have it wrong Levad the chain only crosses twice therefore the inner cog is a reversed freewheel IMHO.
Guilty as charged
I have had another look and, in words (don't they paint a thousend pictures or something) ... the chain goes ...
Top of Chain Ring (CR) to top of Outer Rear Sprocket (ORS)
Bottom of ORS to bottom of Front Sprocket (FS)
Top of FS to to bottom of Inner Rear Sprocket (IRS)
Top of IRS to bottom of CR.
Simple.
Therefore the ORS and the IRS turn in opposite directions so this bike is either fixed and does not move at all, or one of the rear sprockets turns freely making the bike not a fixed and contravening the advertising on one of the stickers on the chainstay
'Tis neither one thing nor 'tother, neither fixed or free