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This is a very easy thing to do and requires minimal practice in photoshop. I will write up a tutorial on this so people can learn how to do it. Its simple but very effective and will give your pictures that "money shot" look.
I want to know how he exposed the whole front caliper without the wheel moving...
That's easy, he just create a new layer, highlight only the stuff you want "blurred" i.e. background wheels etc... You can create motion blurs, motion blasts, etc.. Once you have done that with your new layer you can grab the eraser brush and erase parts you want to expose I.E. caliper and erase the "blur" out of it. You can mess with different opacity's so that it has that soft look. Again, I will make a VIDEO tutorial so its easier to understand.
I was wondering how you'd get a shot with the whole caliper exposed if the wheel wasn't moving, seems like one spoke or another would obstruct your view.