Quote:
Originally Posted by JB1
Looks like we need an additional section on the site: Group sale 
On a more serious note, why would it only be the 15mm ones that break? I'd assume the design and machining of the hub-centric ring is the same for both. Only difference is the thickness of the actual spacer, isn't it? |
The 15mm units have a thin point in the wall where it has to curve in to clear the stock hub ring. This curve generates a very thin point in the spacer ring where the aluminum wall thickness is < 1mm thick. The thicker spacers don't have this clearance issue and hence have a full thickness hub ring.
Take a close look at your spacer and the piece that broke off, try to piece it back together and you'll see what I'm talking about.