This should clear things up (lifted from this page on Tire Rack).
Offset is the distance from the wheel centerline to the mounting surface, so a lower offset means the wheel is biased inboard.
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Steve AdministratorStaff Member Articles Moderator
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BThayer23 Well-Known Member
Are you sure you want 16" wheels? If you are, the lip on those is pretty sweet.
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goaljnky New Member
Just spitballing. 30 offset could be problematic. Plus tire selection in 16s is not all that.
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Rally New MemberMotoring Alliance Founding Sponsor
Well what size tires do you want to run? You could pull them off slightly stretching 205's on them (the stretch would be minimal....7.5 is usually within the normal range for 205's). If you're looking to run 225's or something for autocross, that can be a bit more problematic.
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goaljnky New Member
Either 205 or 215 is fine with me, but at least from TR the pickings are slim. I prefer my tires in the 200 wear range.
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Steve AdministratorStaff Member Articles Moderator
I run 225-45-16s on my SSRs (16x7.5). Works great. I'd be worried about that offset though without spacers.
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goaljnky New Member
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goaljnky New Member
And I just can't get a grip on this offset thing. If they are +30 offset, the wheel is biased to the outside? Would it not push the rim further out if spacers are added?
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Steve AdministratorStaff Member Articles Moderator
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goaljnky New Member
But 42 would be more biased inboard then 30. So I would need spacers to clear the inside?
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Steve AdministratorStaff Member Articles Moderator
Not quite. Look at the diagram from the perspective of the centerline, as though the centerline is fixed. Increase the offset and the mating surface moves outward. That's the effect of the spacers, they increase the offset by pushing the mating surface further out. If the offset is too low you'll have a clearance problem at the back of the wheel.
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Rally New MemberMotoring Alliance Founding Sponsor
Lower offset = more poke (biased outward)
Higher offset = more tuck (biased inward)
You SUBTRACT the spacer width from the original offset to find the final offset. Thus, spacers LOWER the final offset and make the wheel move OUTWARD. -
goaljnky New Member
What Rally said.
About time you came up with something I can agree with. -
Rally New MemberMotoring Alliance Founding Sponsor
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Steve AdministratorStaff Member Articles Moderator
Rally is right of course. In fact, I have a set of wheels with 48mm offset and I have to use spacers to keep them from binding on the suspension.
Now I'm sitting here feeling like an idiot trying to figure out how I got that wrong...and think of an excuse... :confused5: -
goaljnky New Member
I got one for you. Just use this:
http://www.motoringalliance.com/forums/politics-other-messy-stuff/2451-legalize-pot.html -
Steve AdministratorStaff Member Articles Moderator
:lol: Nope, too easy. Think I'll go with stroke this time...yeah, had a little stroke...but I'm better now...yeah, that works... :ihih:
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Steve AdministratorStaff Member Articles Moderator
Back to the topic, how 'bout that +30 offset? I still think you're likely to have clearance problems...but for different reasons now that I'm visualizing it the right way 'round. Don't have any experience with that width and offset combo though so I'm just guessing.
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goaljnky New Member
Well, I am running 17x7.5 with 45 offset right now. So these would come out another 15 mm which is about 6/10 of an inch. I don't think have that kind of clearance. At least not under compression. Oh well. The wife didn't like them anyway.
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lotsie Club Coordinator
Mark
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