The Barcelona is Subrosa's street sprocket, cut from 7075-T6 alloy and run at 8mm thick. That thickness is the whole point of it: a sprocket that spends its life near ledges and rails needs more material than a light race part.

It is aimed at riders who session hard and would rather not think about the drivetrain while they do it. Sold as a sprocket on its own, so keep your existing cranks and bolts unless they are due for replacement.