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#1
10th January 2010, 03:50 PM
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The reason they are offset is to align the top and bottom pivots with the axle centre line better, If you draw an imaginary line through the Sierra upright you will see that if the mushroom insert is concentric it will miss the centre line of the axle, requiring more effort to self centre.
The reason some suppliers mushrooms are concentric is cost, put plain and simple they are cheaper to make. Hope that all make sense  Kind regards John
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Quality parts for the Haynes Roadster - manufactured to a standard, not down to a price. Contact us at component-sales@hotmail.co.uk or visit our website www.3gecomponents.com
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#2
10th January 2010, 07:19 PM
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This has all been done before you need offset mushrooms for the best geometry with sierra uprights.
gts will tell you anything to get a sale . its all to do with kingpin inclination there is a search tool on this forum and yes you do want both sides the same thats why when i made my offset mushrooms i marked them with a file to show the position of max offset Ray 
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#3
10th January 2010, 11:43 PM
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Iv used the search and couldnt find what i was asking, you dont need to answer any questions if you feel its a problem, i was asking my question to who ever wants to reply!
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#4
11th January 2010, 10:11 AM
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Sorry I didnt mean to sound rude
ask away thats what were here for had a quick look there used to be a thread all about the offset but appears to have disapeared what i meant was sometimes its quicker to search than to ask as most of the answers are there already seems this one got taken by the hacker Ray
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#5
11th January 2010, 05:51 PM
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Dont qoute me on this but I think anti dive was mentioned that is built into the Sierra front geometry and the combination of the offset mushroom and the way the Roadster setup works corrects it all ie kpi/castor angles camber self center etc.
And again no quoting but people have had problems using central holed mushrooms,because of the self center requirement in the IVA. Last edited by flyerncle : 11th January 2010 at 08:43 PM.
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#6
11th January 2010, 06:28 PM
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With the cheaper centred adaptors mine drove fine but wouldn't self centre for the SVA, had to put lots of toe-out on and pump tyres up to get them to pass. Changed them to the offset adapters after with the holes right at the front and all is fine now. Cost more but you've got to have them......
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Haynes Roadster / Saturn GRP Bodywork. Now available direct through http://www.gillhamonline.co.uk/ or contact me direct on andrew.hugill@ntlworld.com Regards..........AndyH
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#7
11th January 2010, 06:47 PM
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Now if we could just find some one who supplies these for a cheap price....mmmm
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Website http://www.talonmotorfabrication.co.uk/ Direct email phil@talonmotorfabrication.co.uk talonmotorfabrication@gmail.com Mobile office hours 07514098334
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