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Ok, some of these were getting me confused and thus got me thinking.
Intended questions to be answered: What is the best offset for a X rim at Y width for the front/rear for no fender rolling?
Now please don’t say Howie answered this and it’s in the FAQ because he didn’t say specifically what his 18x9 offset was. It looks like it was 48mm but I don’t know (Not flaming Howie at all, you busted your ass for us and I really appreciate it my friend)
I have seen people saying from 30s to 50s and I can’t believe we have that much play back there given our rear tires proximity to the outer fender, unless we have a butt load of inner clearance between current stock rim and strut tower.
The only way I can see this happening with a 18x9 rim in back is if it has a greater offset than stock, thus putting the majority gain of rim width (and thus tire width) inside the rear wheel well.
OK please help me to see if my math is right. Please if I have messed this up help fix me
Stock rims are 17x8 with +48mm offset
Given that going from and 17x8 to a 18x8 rim should have nothing to do with offset, ideal offset for a 18x8 would still be +48mm for a front rim, which Howie and many others have confirmed.
Now for the rear tire to go from 8 to 9 in width we can generally do one of three things
1. Split the 1 inch gain down the middle. We do this buy keeping offset the same at +48mm. This splits the width gain and moves the edge of the tire 0.5 inches out towards both the strut and the fender edge. I don’t think this is ideal because on my Goat I don’t think I have 0.5 inches to go out to the fender well. Under load it looks like it might possibly rub.
2. Move most of the inch gain outward towards the fender. We do this by reducing offset. If we reduce offset to +35mm we move the inside of the tire 0.0 in closer to the strut and 1.0 in closer to the fender edge. This IMHO is really far worse than #1 above as I don’t see how you won’t rub badly.
3. Move most of the inch gain inward towards the strut tower. We do this by increasing offset. If we increase offset to +61mm we move the inside of the tire 1.0 in closer to the strut tower and 0.0 in closer to the fender edge. This seems the best chance for success. But the question is, is there enough clearance between the new inside tire edge and strut?
My gut says it will be between +48 and +61mm
Now why should anyone care?
Well, since there appears to be very limited fitting information for a good 18x8 – 18x9 set up beyond our sponsors such as Howie, and places like TireRack only give us choices for the 18x8 option, we need to be sneaky
and find our own. And given that a ton of BMW/Audi rims might fall into this category I think we might all benefit.
I for one would love to finally answer definitively the GTG Rim Size vs. Width vs. Offset chart and get it into our FAQs.
So what I am asking if we can all fill out the following info, to which I will place in a chart to help out those of us looking to get new rims and end our range of offset issues once and for all
atriot:
Front Rim Diameter –
Front Rim Width –
Offset –
Tiresize –
Rubs –
Fenders Rolled –
Rear Rim Diameter –
Rear Rim Width –
Offset –
Tiresize –
Rubs –
Fenders Rolled –
So the Stock layout (Mine in this case would be)
Front Rim Diameter – 17
Front Rim Width – 8
Offset – +48
Tiresize – 245/45/17
Tire Brand - BFG KDWS
Rubs – No
Fenders Rolled – No
Rear Rim Diameter – 17
Rear Rim Width – 8
Offset – +48
Tiresize – 245/45/17
Tire Brand - BFG KDWS
Rubs – No
Fenders Rolled – No
Thanks for all the help and thanks for having a great board to talk about our Goats on.
Intended questions to be answered: What is the best offset for a X rim at Y width for the front/rear for no fender rolling?
Now please don’t say Howie answered this and it’s in the FAQ because he didn’t say specifically what his 18x9 offset was. It looks like it was 48mm but I don’t know (Not flaming Howie at all, you busted your ass for us and I really appreciate it my friend)
I have seen people saying from 30s to 50s and I can’t believe we have that much play back there given our rear tires proximity to the outer fender, unless we have a butt load of inner clearance between current stock rim and strut tower.
The only way I can see this happening with a 18x9 rim in back is if it has a greater offset than stock, thus putting the majority gain of rim width (and thus tire width) inside the rear wheel well.
OK please help me to see if my math is right. Please if I have messed this up help fix me
Stock rims are 17x8 with +48mm offset
Given that going from and 17x8 to a 18x8 rim should have nothing to do with offset, ideal offset for a 18x8 would still be +48mm for a front rim, which Howie and many others have confirmed.
Now for the rear tire to go from 8 to 9 in width we can generally do one of three things
1. Split the 1 inch gain down the middle. We do this buy keeping offset the same at +48mm. This splits the width gain and moves the edge of the tire 0.5 inches out towards both the strut and the fender edge. I don’t think this is ideal because on my Goat I don’t think I have 0.5 inches to go out to the fender well. Under load it looks like it might possibly rub.
2. Move most of the inch gain outward towards the fender. We do this by reducing offset. If we reduce offset to +35mm we move the inside of the tire 0.0 in closer to the strut and 1.0 in closer to the fender edge. This IMHO is really far worse than #1 above as I don’t see how you won’t rub badly.
3. Move most of the inch gain inward towards the strut tower. We do this by increasing offset. If we increase offset to +61mm we move the inside of the tire 1.0 in closer to the strut tower and 0.0 in closer to the fender edge. This seems the best chance for success. But the question is, is there enough clearance between the new inside tire edge and strut?
My gut says it will be between +48 and +61mm
Now why should anyone care?
Well, since there appears to be very limited fitting information for a good 18x8 – 18x9 set up beyond our sponsors such as Howie, and places like TireRack only give us choices for the 18x8 option, we need to be sneaky
I for one would love to finally answer definitively the GTG Rim Size vs. Width vs. Offset chart and get it into our FAQs.
So what I am asking if we can all fill out the following info, to which I will place in a chart to help out those of us looking to get new rims and end our range of offset issues once and for all
Front Rim Diameter –
Front Rim Width –
Offset –
Tiresize –
Rubs –
Fenders Rolled –
Rear Rim Diameter –
Rear Rim Width –
Offset –
Tiresize –
Rubs –
Fenders Rolled –
So the Stock layout (Mine in this case would be)
Front Rim Diameter – 17
Front Rim Width – 8
Offset – +48
Tiresize – 245/45/17
Tire Brand - BFG KDWS
Rubs – No
Fenders Rolled – No
Rear Rim Diameter – 17
Rear Rim Width – 8
Offset – +48
Tiresize – 245/45/17
Tire Brand - BFG KDWS
Rubs – No
Fenders Rolled – No
Thanks for all the help and thanks for having a great board to talk about our Goats on.