Calculation for determining clearance w/ changes in camber
#1
Calculation for determining clearance w/ changes in camber
I had to calculate this today, so I figured I would help everyone out. Time to break out your trig/algebra books....
pretty much, use a trig formula with a right angle triangle. I created a formula for you to use below after providing background information and data translations....You must use a right angle triangle to apply the theory.
In this pic, visualize your wheel well. The angle is front the center point of your wheel. The angle (theta) will be the degree change in your camber setting. Side CB (adjacent side) will be your wheel + tire height. Side AB will be your clearance (opposite side)
remember: tan(angle theta) = opposite side(AB)/adjacent side(CB)
therefore: to figure out opposite side length (AB) you must have the following algabraic formula:
tan(angle theta) x adjacent side (CB) = opposite side (AB)
tan(theta)xCB = AB
theta = tan(1*) = .0175
CB = Sidewall height (mm) + (Wheel diameter in mm/2) {note 1in = 25.4mm)
AB = clearance (mm)
theta(CB) = AB
Here is what I ran for my car today. Running a 255/35/19 rear
Sidewall height = 255(.35) = 89.25mm
Wheel Diameter = 19"(25.4) = 482.6mm/2 = 241.3mm (radius)
CB = 89.25+241.3 = 330.5mm
.0175(330.55) = 5.78mm change in clearance
pretty much, use a trig formula with a right angle triangle. I created a formula for you to use below after providing background information and data translations....You must use a right angle triangle to apply the theory.
In this pic, visualize your wheel well. The angle is front the center point of your wheel. The angle (theta) will be the degree change in your camber setting. Side CB (adjacent side) will be your wheel + tire height. Side AB will be your clearance (opposite side)
remember: tan(angle theta) = opposite side(AB)/adjacent side(CB)
therefore: to figure out opposite side length (AB) you must have the following algabraic formula:
tan(angle theta) x adjacent side (CB) = opposite side (AB)
tan(theta)xCB = AB
theta = tan(1*) = .0175
CB = Sidewall height (mm) + (Wheel diameter in mm/2) {note 1in = 25.4mm)
AB = clearance (mm)
theta(CB) = AB
Here is what I ran for my car today. Running a 255/35/19 rear
Sidewall height = 255(.35) = 89.25mm
Wheel Diameter = 19"(25.4) = 482.6mm/2 = 241.3mm (radius)
CB = 89.25+241.3 = 330.5mm
.0175(330.55) = 5.78mm change in clearance
Last edited by Matzo Ball; 11-08-2010 at 10:59 PM.
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