I'm sure these 'tensioners' do what they're supposed to do on derailleured bikes where you can pull the wheel rearward for a quick removal, and a very clever design at that. But on a fixed gear with no chain slack, this makes absolutely no sense. I realize they're completely removable but I think they should simply be removed from your web photos, including its description to avoid confusion as to why they're there in the first place as most fixed gear riders will agree that they're simply not practical.