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  #19  
Old 27-12-2017
OzRick25  OzRick25 is offline
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Originally Posted by Easy700 View Post
I'm in a similar situation, 2015 JK Rubicon. Putting in a 3.5" lift. About to order 35x12.5x17 BFGs. I'm let to believe the ideal rim to ensure no rub is 17x8.5 (4.5 BS) but 8.5" rims are rare so probably have to go to 17x9 rims with 4.5" BS. How much will these protrude from the stock fenders. I'm worried that even with 2" wider flares I could be cutting it fine.
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Its more accurate if you know the offset rather than backspace but assuming they are zero offset wheels i think the tyre walls would stick out the flares by about 55mm
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Old 27-12-2017
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Its more accurate if you know the offset rather than backspace but assuming they are zero offset wheels i think the tyre walls would stick out the flares by about 55mm
For this application 8.5" wide 4.5" backspace are -6mm offset. 9" wide 4.5" offset are -12mm offset.

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Old 27-12-2017
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For this application 8.5" wide 4.5" backspace are -6mm offset. 9" wide 4.5" offset are -12mm offset.

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the 8.5s would have the tyre out of the stock flare by 61mm and the 9s 67mm

here is a link to a good comparison the stock fender clearance on the factory 17x7.5 with 255/75R17 I measured at 21mm. I don't use the scrub radius and suspension clearance functions

https://www.wheel-size.com/calc/?whe...cl=50mm&sr=0mm
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Old 28-12-2017
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the 8.5s would have the tyre out of the stock flare by 61mm and the 9s 67mm

here is a link to a good comparison the stock fender clearance on the factory 17x7.5 with 255/75R17 I measured at 21mm. I don't use the scrub radius and suspension clearance functions

https://www.wheel-size.com/calc/?whe...cl=50mm&sr=0mm
Thanks. That's a cool calculator that I'll have a play around with. It does have a flaw though. It's not factoring into account how the rim width changes section width. 1/2 inch wider rim is going to increase section width by 2/10 of an inch (approx 5mm) which adds to how far the tire sticks out. Only a small amount, I know, but if you were comparing rims two inches different in width, it adds up.

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Old 28-12-2017
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Originally Posted by Easy700 View Post
Thanks. That's a cool calculator that I'll have a play around with. It does have a flaw though. It's not factoring into account how the rim width changes section width. 1/2 inch wider rim is going to increase section width by 2/10 of an inch (approx 5mm) which adds to how far the tire sticks out. Only a small amount, I know, but if you were comparing rims two inches different in width, it adds up.

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Yeah I wasn't using it for inside clearances just using offset and tyre size too get an idea of how far my 285s would come out, which I found to be pretty accurate for.
Unfortunately tyres are also not exactly what they claim to be in size as well and you get differencea of up to 1/2 an inch between different manufacturers tyres of the same nominal size so you can't tell exactly until you actually mount that particular tyre and measure it
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Last edited by OzRick25; 28-12-2017 at 08:55 AM.
  #24  
Old 30-12-2017
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About half way down on this thread there is a pic of one with external rubber extenders so you can see what they look like.

http://www.ausjeepoffroad.com/forum/...62#post1626762
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