create one of the spokes as you would like it to lok. Then group all the bits together and move the pivot point to the bit that will be inside of the wheel. after you've got that in position then you can use the duplicate option box to position the spokes. So if you want 20 spokes then do 360/20= 18. So you need to set your duplicate options rotate y to 18 degrees and 19 instances (you already have the 20th in position)
that should be enough to get you started.
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