Re: wheel offset

[Michael Spiers <mikes@specnet.com>]

> Wheel gurus: how do I find out the correct offset needed when buying wheels?

I'm no wheel guru, but I went through this B.S. when I was tryin' to find my
17's.  What I know:

There are 25.7mm per inch.  Therefore, for example, if you want to increase the
wheel width by one inch, you would DECREASE the wheel offset by half of an
inch, or by 12.85mm.  Now, if you wanted to go to a skinier rim, say from a 6
to a 5.5, then you would INCREASE the offset by half of a half an inch, or
6,245mm.  You didn't mention what type of car you're doing this to, but you say
a 15x6, so I'll assume a black '87 TQ with a muched front clip.  My factory
15x6 TQ rims had an offset of 45mm.  If I was to go to a 15x5.5, I'd want an
offset of 51.245mm, to keep things peachy-keen.  If on the other hand I wanted
to put 17.5's on there, I'd want an offset of 25.905.  You aren't going to find
exactly what you need, so just settle for whatever is closest.  HTH!

-- 
-Mike
mikes@specnet.com
mks107@psuvm.psu.edu
87 5000CS TQ
84 5000S (2,000 miles away and a mile high)
90 80 (sibling's mode of transportation I get lynched into working on)