RichFL

I need to convert mm of toe to degrees. Can anyone tell me if my calculations are correct/

Front 26.8 Tire diameter (inches) Tire Rack
680.72 25.4 multiply to convert to mm
3.1416 Pi multiply to calculate circumference
2138.549952 Circumference (mm)
360 Degrees In a circle
5.940416533 mm per degree Divide circumference by degrees in a circle
1.4 Target total toe (mm)
0.235673709 Degrees Target divided by mm per degree
14.14042257 60 Multiply to convert to minutes
7.070211283 2 One half to determine minutes per side

Bill Lehman

I would use trig. Opposite divided by Adjacent = Tangent. Convert Tangent to Angle.

provoste

I always use 1mm=.08 degrees.

1.4mm would be .112 total toe. no shop will hit that 100% on the mark though, so I always give ranges, like .11-13 total toe in this case.

StoogeMoe

You're making it too difficult. Use Inv tangent like Bill said. Or for totally mindless operation use this link!

https://robrobinette.com/ConvertToeInchesToDegrees.htm

RichFL

Bill - my undergraduate degree is engineering so I've had a lot of math. Of course, I was studying trig back when slide rules were being used. I'm going to have to research your suggested approach. I may have understood it a long time ago.

Matt Romanowski

You guys are being obtuse. SOHTACTOA

Thundermoose

SCT
OAO
HHA

mark kibort

Its very simple. there is NO conversion . as was said you need to use Trig. say you have the rim as the measuring point( front and rear ). you make a mark on the ground that reflect the front and rear positions. (or use the position of the rim to hold a string). then do the other side. the distance difference between the front and the rear of the the tires is the toe in or out. say its 1/4" ( 6mm) you take the 6mm and divide by the rim width (F/R) say its 18" (457mm) the toal toe is going to be 6/457 or 0.013 use INV TANGENT to get the toe in degrees which would be 0.74 degrees make it 1/8" that makes it .4 degrees toe (in or out) Out if the rear is wider than the front between the two points. and divide by 2 to get the toe of one side, which would be 0.2 degrees.

summary: difference of rear to front of rim to center or other side / rim width (f) INV Tangent = toe in degrees.

mark kibort

I dont follow your math... maybe for your 25" rims on the chevy tahoe! . if you re using the wheel edge as a reference point. Using the outer edge of the wheel of 18", 1.4mm toe, would be 0.17 degrees T-Toe and 1mm would be .12 degrees T-Toe.

ExMB

That will not work. Too much depends on where and how the actual measurement is taken.

ExMB

Lets make it easy for the poor slide rule trained engineer.

See if the attachments help.

RichFL

ExMB - Thank you. I thought someone had probably done the math using something more sophisticated than a slide rule - lol.

Viperbob1

I turn the setting on alignment rack to degrees from inches. Simple. No math required. Just $50,000 for a machine and a hole to sit it in...

Matt Romanowski

Hunter? The last I looked, they were no more accurate than a string setup. Much more user friendly though.

MSR Racer

Bob, PMd you