This is a nice take on the challenge theme. Good composition by positioning the hub off-center. COlors are strong. Some noise in the top areas of the image, but nothing overly critical. Good luck.
Simple but elegantly done. Perfect placement of the bit where the thingys meet the thingy...sorry that might have been too technical...great colour too:) 9
The colors you've chosen here leaves me breathless. The image is very DPC friendly and the center is properly placed using the thirds. The only pitfall IMHO is the use of the black border. A bit too much IMHO. (8)