If it matters [might be less than 0.5mm, You could always just get 3_ 9 speed thickness tooth chainrings . Salsa another QBP brand, TA and Black spire and some other folks
use 7075 alloy , which is harder wearing than the 6061 stuff stock on the Sugino .. price point
http://www.bikeman.com/store/merchan...e-asc&show=500