Sharp edges while maintaining circular shape I encountered a problem when modeling an inside of the wheel. 
The problematic part is where a spoke joins a rim. I want both the rim and spoke to have sharp edges, but when I crease the transition between them, the circular shape of the rim is no longer maintained there. And when I don't crease the transition it looks weird.
Here is how the creasing looks like without subsurf in edit mode:



If you would like to do some tests on the model, you can download it here.
Is there a better way to get sharp edges than via creases?
Thank you in advance!
Im not sure if it would help but, you can try separating the inside of the rim by selection and take off the subsurf in the inside of the rim.