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My son just got 22" on his 05 Chevy Pick-up.  He replaced his 17" rims for them. My question is what kind of difference does rim size have to do with speed.  The reason for my question is....He recently got stopped two days in a row for speeding.  Ticket says 75 in a 65, but he swears he had  his cruise set on 65.....So???  Is there that much difference in speed?  

Yes the height of the tire does have a lot to do with speed and torque, the trucks speedometer is calibrated for a certain size tire , if you put on a bigger or higher tire the you are actually going faster than what the speedometer is telling you.  

Here's a tire calculator to help figure this out:

http://www.1010tires.com/TireSizeCalculator.asp  

Rim size alone (diameter) has nothing to do with vehicle speed.  The size (overall diameter) of the tire mounted on that wheel does however. It is quite possible to experience a significant increase in speed by installing a tire that has a significantly greater overall diameter than that of the standard tire. I would refer back to the standard 17" tire for its overall diameter and look for a 22" tire that is as close to that overall diameter as possible.  Beware however that by nature, your 05 Chevy is a Truck and as such probably has the capability to carry a load greater than most 22" tires are capable of supporting safely.  Therefore, to avoid the unpleasantries of a tire failure associated with overlaoding please refer to your local tire professional as he can advise as to the correct tire for your specific application based on your trucks requirements.