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ZookZilla96

az supporter
Joined: Mon May 24, 2010 8:58 am Posts: 229 Location: Noosa Sunshine Coast
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 Posted: Thu Jan 20, 2011 10:36 am |
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Hey guys,
Looking at getting some rims off low range but I'm after a decent offset and they have "backspace". Does anyone know what "backspace" is? I've never heard of it before.
Cheers
_________________ Suncoast Exhaust & Mechanical,Noosa,QLD. All Mecha
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BlueSuzy

az supporter
Joined: Sun May 04, 2008 11:30 pm Posts: 9716 Location: NSW
Vehicle: SJ51 LWB, SJ70 SWB
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 Posted: Thu Jan 20, 2011 10:40 am |
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93zook
Joined: Wed May 27, 2009 11:30 pm Posts: 699 Location: perth
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 Posted: Thu Jan 20, 2011 10:41 am |
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its the measurement from the mounting surface to the inside egde of the wheel. kinda like rim offset but different
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ZookZilla96

az supporter
Joined: Mon May 24, 2010 8:58 am Posts: 229 Location: Noosa Sunshine Coast
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 Posted: Thu Jan 20, 2011 10:49 am |
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So the bigger the backspace the littler the offset?
_________________ Suncoast Exhaust & Mechanical,Noosa,QLD. All Mecha
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BlueSuzy

az supporter
Joined: Sun May 04, 2008 11:30 pm Posts: 9716 Location: NSW
Vehicle: SJ51 LWB, SJ70 SWB
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 Posted: Thu Jan 20, 2011 10:50 am |
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DID YOU READ THE THREAD?
_________________ BlueSuzy wrote: I'm over the G16b's.
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Fatzook

az supporter
Joined: Sat Oct 27, 2007 11:30 pm Posts: 14977 Location: The Hills
Vehicle: Vitara, NGV
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 Posted: Thu Jan 20, 2011 10:53 am |
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ZookZilla96 wrote: So the bigger the backspace the littler the offset?
The more backspace a rim has, the greater its positive offset. ( or lesser negative offset  )
_________________ 2013 GV 1998 SV420 ute
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ZookZilla96

az supporter
Joined: Mon May 24, 2010 8:58 am Posts: 229 Location: Noosa Sunshine Coast
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 Posted: Thu Jan 20, 2011 10:59 am |
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Fatzook has understood what I've said. So if the rim is an 8" wide rim with a backspace of 4" that theoretically means there is 100mm of negative offset? just trying to work the maths.
_________________ Suncoast Exhaust & Mechanical,Noosa,QLD. All Mecha
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Fatzook

az supporter
Joined: Sat Oct 27, 2007 11:30 pm Posts: 14977 Location: The Hills
Vehicle: Vitara, NGV
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 Posted: Thu Jan 20, 2011 11:07 am |
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ZookZilla96 wrote: Fatzook has understood what I've said. So if the rim is an 8" wide rim with a backspace of 4" that theoretically means there is 100mm of negative offset? just trying to work the maths.
No. Offset is measured from the centre of the rim.
So a 8" rim with 4" backspace has a 0 offset 
_________________ 2013 GV 1998 SV420 ute
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BlueSuzy

az supporter
Joined: Sun May 04, 2008 11:30 pm Posts: 9716 Location: NSW
Vehicle: SJ51 LWB, SJ70 SWB
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 Posted: Thu Jan 20, 2011 11:08 am |
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DID YOU READ THE THREAD THAT I POSTED??
8"rim-4"backspace=1/2 a rim. Which is the centreline=0mm offset
_________________ BlueSuzy wrote: I'm over the G16b's.
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ZookZilla96

az supporter
Joined: Mon May 24, 2010 8:58 am Posts: 229 Location: Noosa Sunshine Coast
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 Posted: Thu Jan 20, 2011 11:21 am |
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Sorry bluesuzy didnt quiet understand the full way it worked. I'll do some working out to see exactly what backspace I need to get
_________________ Suncoast Exhaust & Mechanical,Noosa,QLD. All Mecha
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Fatzook

az supporter
Joined: Sat Oct 27, 2007 11:30 pm Posts: 14977 Location: The Hills
Vehicle: Vitara, NGV
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 Posted: Thu Jan 20, 2011 11:46 am |
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ZookZilla96 wrote: Sorry bluesuzy didnt quiet understand the full way it worked. I'll do some working out to see exactly what backspace I need to get
So you understand that Offset is measured from the centre of the rim? So positive offset will move the wheel centre out, which inturn locates the wheel further under the car. Negative is ofcoarse the opposite, making the wheel stick out from the wheel arch.
Backspace is just another way of measuring offset.
_________________ 2013 GV 1998 SV420 ute
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steak_knife

az supporter
Joined: Fri May 22, 2009 11:30 pm Posts: 21335 Location: Smart Ass Island
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 Posted: Fri Jan 21, 2011 8:12 am |
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BlueSuzy wrote: DID YOU READ THE THREAD THAT I POSTED??
8"rim-4"backspace=1/2 a rim. Which is the centreline=0mm offset
 Are you angry??? 
_________________ I used to be indecisive,
now I'm not so sure.....
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BlueSuzy

az supporter
Joined: Sun May 04, 2008 11:30 pm Posts: 9716 Location: NSW
Vehicle: SJ51 LWB, SJ70 SWB
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 Posted: Fri Jan 21, 2011 9:28 am |
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was
_________________ BlueSuzy wrote: I'm over the G16b's.
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atari4x4

az supporter
Joined: Mon Dec 11, 2006 10:30 pm Posts: 34842 Location: East Radelayed
Vehicle: SV420+SV620 Vitara's
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 Posted: Fri Jan 21, 2011 9:30 am |
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i think he's suffering from post natal suzuki syndrome?
_________________ You're just hating because you don't understand
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BlueSuzy

az supporter
Joined: Sun May 04, 2008 11:30 pm Posts: 9716 Location: NSW
Vehicle: SJ51 LWB, SJ70 SWB
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 Posted: Fri Jan 21, 2011 9:55 am |
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yet to re-birth.  legit though.
_________________ BlueSuzy wrote: I'm over the G16b's.
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atari4x4

az supporter
Joined: Mon Dec 11, 2006 10:30 pm Posts: 34842 Location: East Radelayed
Vehicle: SV420+SV620 Vitara's
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 Posted: Fri Jan 21, 2011 10:05 am |
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is that rebirth or afterbirth?
_________________ You're just hating because you don't understand
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BlueSuzy

az supporter
Joined: Sun May 04, 2008 11:30 pm Posts: 9716 Location: NSW
Vehicle: SJ51 LWB, SJ70 SWB
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 Posted: Fri Jan 21, 2011 10:08 am |
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re-inCARnate
_________________ BlueSuzy wrote: I'm over the G16b's.
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303zuke

az supporter
Joined: Wed Aug 19, 2009 11:30 pm Posts: 2447
Vehicle: LJ50V, SJ70
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 Posted: Fri Jan 21, 2011 11:16 pm |
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Backspace is also a "simple" way (aka Dumb) to know what rims will not foul on chassis components for a particular vehicle. eg if your stock rims have 3 1/2 inches of backspace and do not hit the chassis, springs or steering components, then an 8" rim with 3 1/2" of backspace will also clear, or a 10" rim, etc.
It is a dumb way because it does not take into account fouling bodywork or bumpers, or the clearance issues of taller or wider tyres, or the effect of offset on camber and caster.
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