We verify how the kart reacts on track depending on weather caster is positive or negative. Find out tests results!
The caster is a major parameter of front-end geometry and overall weight distribution on a kart.
The caster is the tilt angle (front/back) of the kingpins (the bolts that the stub-axles pivot around). It regulates tire behavior through bends by raising the outside front wheel and lowering the inside front wheel.
In turn, this causes more or less of a weight transfer to the front end and more or less of a load reduction on the rear inside wheel, sometimes great enough for it to lift off the ground.
The caster angle affects weight transfer through bends, with obvious consequences on grip.
A fully loaded caster (meaning, with the eccentric shifted backward to accentuate the pre-set angle formed by the Cs in the chassis) causes the maximum possible load transfer to the front tires and so better corner-entry performance.
At the same time, it unloads the rear tires, especially the inside tire, causing it to lift off the ground.
The result is more bite up front and less at the rear, which helps corner-entry, allowing to keep good speed, but reduces traction (and acceleration).
Of course, a fully unloaded caster has the exact opposite effect.…
(keep reading on the “TRACK TEST | TECH” TKART Magazine channel)