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  #1  
Old 27th August 2004
spgdude spgdude is offline
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Default Moving the rear axle foward?? How

Hey I got the super aeros on with 205/55/ and there rubbing I heard that moving the axle foward will solve the problem. But How do you do it, I searched but didnt find any technical details on how to go about moving it, btw my car is an 88' spg if that matters.
Thanks,
John
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Old 28th August 2004
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Jezzadee Jezzadee is offline
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I think you will always get rub with 205/55/16 even if you move the axle. You need 205/50/16 tyres like me or 205/45/16. Even then some brands may rub at the rear. 195/50/16 is Saab's recommendation. The 55 profile is OK for a 9000 but not for a 900. I put on stiffer rear springs and shocks and I don't get rub any more. There's a mention of moving the axle over on www.twinsaabs.com but it won't help you unless you change the tyres.
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Old 28th August 2004
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205/55/16 are too large for the c900, that is a later type 9000 tyre size.

Moving the axle forwards does help to prevent rubbing as the tyres don't actually rub at the top of the arch but towards the rear, about 45 round from the vertical.

To move the axle forwards the front mounting points for the trailing arms need to be rotated so the what was the rear bolt position becomes the front (this pulls the axle forwards). The rear link arm then needs to be extended to keep the axle upright.

Ubipas site contains details on the work required.
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Old 28th August 2004
spgdude spgdude is offline
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Thanks guys, the rubbing isnt too bad, so when I take them off to put snows on I will buy a set of either 205/50's or 205/45s'
which is better??
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Old 28th August 2004
Smackrazor Smackrazor is offline
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45 is a 45mm profile, it means there'll be less tire around the edges of the rim, and the ride will be less dampened, but it will look cool.
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Old 28th August 2004
spgdude spgdude is offline
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Quote:
Originally Posted by Smackrazor
45 is a 45mm profile, it means there'll be less tire around the edges of the rim, and the ride will be less dampened, but it will look cool.
I know, pretty much what Im asking is will a 50mm tire fit and not rub or should I just go with a 45mm tire, look cool, and not have it rub but have a harder ride??
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Old 29th August 2004
Vince T Vince T is offline
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Actually, the '45' or '50' does not denote 45mm or 50mm.

Rather, this number denotes the aspect ratio - it is stated as a percentage of the tire's width.

So a 205/55 will have a sidewall height 55% of 205mm; a 205/50 will have a sidewall height of 50% of 205mm.
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Old 29th August 2004
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Brands vary - some tyres have rounded 'shoulders' and some are square. This will affect rub. 205/50/16 is actually a bit too large, but I get away with it as the tyres are Dunlop SP Sport 9000 with very rounded shoulders. For summer, I would go for a 205/45/16 and a max performance tyre, but even then you may need to replace the rear shocks and springs for stiffer ones. In winter for snow tyres you want as narrow a tyre as you can get. Keep your 15" wheels as 195/60/15 is perfect - put on some quality studded tyres and these cars handle better than anything else in the snow.
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