Downsize Rims

[jed]

Got a '07 Uplander that uses an odd rim - 17"x6.5, 155mm, 52mm offset, 6 lug. I figured out either a 15 or 16" tire can be used, but need to find a rim (not tire) that will fit.

Why do I do this? For winter tires I would like a bit narrower tire, so going to a 15 or 16" does this for me.

Any resources out there to help out?

[Pete_Coach]

I find this site has a quick and dirty comparison
http://www.miata.net/garage/tirecalc.html
The I go to here to refine it.
http://www.1010tires.com/tiresizecalculator.asp

[Amuthini]

should be fine to downsize as long as the tire size you pick keeps the same stock diameter. just make sure the smaller rim will clear the brakes and stuff before you buy.