#3 is better than #4 because on #4 I keep seeing a 'C'. Like the tyre on the edge of the writing though. #9 and #10 are good, classy but not quite what i'm looking for. Looking for something more colourful.
I really like logo #3 still. I think maybe do some more style along this line. prehaps differnt colours or a sprocket instead of a tire? Something like this?