17x10 with a 275/40/17 would be a pretty sweet setup!
Would need fender flairs and lots of trimming at least on the speed3; I know nothing about fitment on the speed6.
What tire are you planning on running?
Yeah they will fit!
Make sure you like the way the 18x8.5 look; because the look nothing like you have seen in this thread. The face is rounded instead of flat like you see in every picture above.