Anti-roll bar

An anti-roll bar (roll bar, anti-sway bar, sway bar, stabilizer bar) is an <a href="/facts/Automobile/I1IsH8IK">automobile</a> <a href="/facts/Suspension_(vehicle)/KuAt6dB1">suspension</a> part that helps reduce the <a href="/facts/Body_roll/eV6rvfm5">body roll</a> of a vehicle during fast cornering or over road irregularities. It links opposite front or rear wheels to a <a href="/facts/Torsion_spring/qMrn3XGM">torsion spring</a> using short <a href="/facts/Lever/HYDtMuAq">lever</a> arms for anchors. This increases the suspension's <a href="/facts/Body_roll/eV6rvfm5">roll</a> stiffness—its resistance to roll in turns.
The first stabilizer bar patent was awarded to Canadian inventor Stephen Coleman of <a href="/facts/Fredericton%2c_New_Brunswick/XwkNbfLY">Fredericton, New Brunswick</a> on April 22, 1919.
Anti-roll bars were unusual on pre-WW2 cars due to the generally much stiffer suspension and acceptance of body roll. From the 1950s on, however, production cars were more commonly fitted with anti-roll bars, especially those vehicles with softer coil spring suspension.

Anti-roll bar open-in-new

Anti-roll bar