Middleburn Uno XC Ring-Spider Hardcoat. Chainrings - MTB. For singlespeed users Middleburn has developed the Uno, an all-in-one spider & chainring. Beautiful, simple, and lightweight. Will only fit Middleburn cranks. 32t and 34 only. Black or Hardcote (grey) finishes. Redesigned for extra strength and ....
Weaknesses: None really. I don't think the spline interface will work with any cranks other than Middleburn, but that really isn't a weakness.
I have been using Middleburn cranks and rings on my singlespeeds for over 5 years and have been very pleased with the Hardcoat rings. They wear extremely well and are nice and stiff. As far as I know, the rings will not work with any cranks other than Middleburn, so be sure to do your homework before ordering them if you want to use them on any other brand of cranks.