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Anti-Roll Bars
Anti roll bars and chassis bracing by Ultra Racing and OMP: over 4,500 references for front and rear axles, strut braces and underbody bars, with model-specific mounting points.
Filter by make and model to see what bolts to your car. Fitting is usually to existing points, without modification.
What an anti roll bar does
An anti roll bar ties the two wheels of an axle together in torsion. When the body starts to lean in a corner, the bar resists that twist and keeps the car flatter. It is the one suspension change that reduces body roll without making the ride harder in a straight line, because it only acts when the two wheels move differently.
That is what separates it from stiffer springs: springs firm up the whole ride, a bar acts only in roll.
Bars, strut braces and underbody bracing
- Anti roll bars. Front, rear or both. The front bar tends to reduce understeer at the limit; the rear bar sharpens turn-in.
- Strut braces. Tie the tops of the suspension towers together, cutting the flex of the bodyshell under load.
- Underbody bracing. Stiffens the floorpan and the subframe mountings.
Balance matters more than stiffness. Fitting only a very stiff rear bar can make a car nervous at the back, so the two axles are best considered together. Bars also work alongside the rest of the suspension: suspension bushes in good condition are what let the bar do its job, and springs set the ride height it works at.
Fitting and adjustment
Bars mount to the car's existing points and most come with their own bushes and links. Adjustable bars offer several settings: start on the softest, and only move up if the car needs it. Because the mounting points are part of the suspension, alignment afterwards is worth doing.
Frequently asked questions
Will an anti roll bar make the ride harsher?
Barely, in a straight line. A bar only works when one wheel moves relative to the other, so it does not stiffen the ride over an evenly surfaced road the way harder springs do.
Front, rear, or both?
Both, if you want to keep the balance the manufacturer intended. If you fit only one, the front is the safer choice on most front-wheel-drive cars.
Is any bodywork modification needed?
No. Model-specific bars use existing mounting points. Check the listing for the exact model and years.
Do I still need stiffer springs?
Not necessarily. If body roll is the complaint, a bar addresses it directly and keeps the ride. Springs are the answer to ride height and overall rate.