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Hardrace camber-adding (offset)/roll-center-adjusting ball joints for STR and track S2000s

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Old 09-26-2011, 09:47 PM
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It might be velocityshop's site, but I don't see part 6621 anywhere on that site. Don't want someone to make the mistake of ordering the 6622, which is on that site. Your best bet is to get it thru the velocityshop.com website our call them directly.
Old 09-27-2011, 05:09 AM
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So who has put the most miles and track time on these things?
Old 10-02-2011, 09:28 PM
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Good information!
Old 10-05-2011, 11:12 PM
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Bumped into this now that I will be lowering my car more. Are these parts needed only for a performance aspect or since the geometry of the suspension is changed these are required to get back the performance that is degraded when car is lowered?
Old 10-06-2011, 10:31 AM
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Are these parts needed only for a performance aspect or since the geometry of the suspension is changed these are required to get back the performance that is degraded when car is lowered?



Yes and yes. The offset of the ball joint adds negative camber for extra cornering grip but at the cost of more inside shoulder tire wear on the street.


The roll center adjuster moves the roll center closer to its stock location for a lowered car.
Old 10-16-2011, 06:19 AM
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Sorry for the ignorance, but do you adjust camber on the joint aswell as stock camber? Or does it just allow for movement of the stock camber settings?

if so, the stock camber brings the top of the wheel in whereas this hard race joint brings the bottom of the wheel out...would I still be get that standard movement of the top going in for a certain amount of camber then as the hard race joint takes action the bottom starts to come out?

Sorry I'm just a little confused as to how it works..
Old 10-16-2011, 08:02 AM
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Stock and the hardrace piece move the lower control arm outboard for more camber. The hardrace item just allows the lower arm to move more outboard than stock.
Old 10-17-2011, 03:29 PM
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I just ordered a set, Ill post up how they are after my next autox
Old 10-17-2011, 04:52 PM
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Anyone order the Upper Rear A-arm ball joint? I am looking for a replacement for my SPC upper rear and I can't find anyone who sells them.
Old 10-17-2011, 04:58 PM
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Ordered a set of SPC's from Tire Rack today....oh wait...found this thread and ordered these. Review to follow.


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