Enve Pi and no protractor

[joosttx]

Here is the problem:

I removed my Enve decals and now want to replace them. There are three decals per each side of the wheel equally spaced. How do I equally space the stickers (i.e. like a Mercedes emblem) without a protractor? In other words, how do I equally divide the wheel into 3rds?

[joosttx]

figured it out.....

[ultraman6970]

There you have it... u need a compass and a piece of paper... then extend the lines once you put the paper at the center of the axle.

https://www.youtube.com/watch?v=ePWyFkBqtMw

[Louis]

figured it out.....

Counted spokes?

[joosttx]

I like this approach since I dont need to make a compass that will draw a the circumference of 29er wheel.

Step 1: Draw the Diameter

Use your straightedge (ruler or protractor) to draw a diameter or line through the middle of the circle that reaches both edges. This of course divides your circle in half.

Step 2: Mark the Center

If the center of the circle is not marked, you will find it in this step because the diameter of any circle is the longest distance across the circle. Simply divide the value of the diameter by 2 and place a point halfway along the line from one edge to indicate the center.

Step 2: Measure Halfway to One Edge

Use your ruler or protractor to find a point exactly halfway between the center and one edge, or equivalently, one-fourth of the diameter or half of the radius. Label this point A.

Step 3: Draw a Perpendicular Line Through Point A to Both Edges

Use your protractor, or if necessary the short edge of your ruler, to draw a line through point A. Extend this line to the edges of the circle. Label the points at which this line intersects the edge of the circle B and C.

Step 4: Draw Lines from the Center to Points B and C

Using your straightedge, create lines connecting the center of the circle to points B and C. These lines represent radii of the circle, which have a value of half of the diameter.

Step 5: Use Geometry to Solve the Problem

You now have two right triangles inscribed within the circle. Because the short leg of each of these is one-half the distance of the hypotenuse of the circle, which is the same as a radius, you may recognize that these right triangles are "30-60-90" triangles, which have the property of the shortest side being half the length of the longest.

Because of this, you can conclude that the interior angles of the circle you have created between the two hypotenuses, and the hypotenuse and the diameter on the opposite side of the circle, are each 120°. You thus have a circle divided into three equal parts.

[joosttx]

Counted spokes?

I can never be sure if I am counting correctly. but thats the winner thus far.

[RobJ]

I was thinking place the first decal and that becomes the point of an isosceles triangle. The remaining two decals placed at the other angles of the triangle.


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[charliedid]

Piece of string and a grease pencil.

https://www.youtube.com/watch?v=ePWyFkBqtMw

Just do this since you have circle and center already.

Work with the valve hole away (at top) from you so that will be one of the points for a sticker. Center the decals from your three points.

[Peter B]

Couldn't you just take a cloth measuring tape or a length of string, wrap it around the rim bead, divide the resulting length by 3 and mark decal centers?

[joosttx]

Couldn't you just take a cloth measuring tape or a length of string, wrap it around the rim bead, divide the resulting length by 3 and mark decal centers?

This is harder than it looks.

[Ozz]

I vividly remember this exact problem from high school geometry class...ugh.

[Peter B]

This is harder than it looks.

Measure around the wheel in the center of the rim channel. Use a bit of tape to hold the string in place. Extend the marks around the bead using a small square?

[Dino Suegiù]

Fold once to determine halves; fold once again to determine thirds; (if you fold yet again you'll determine sixths but six decals are six too many so who cares); unfold and decal away....

https://i.stack.imgur.com/FRkgZ.png

[joosttx]

For the tools and effort. I’m going draw a line halving circle then draw another line perpendicular at 1/4s the distance of the drawn line. Where that line insects should do it. Almost as good as counting spokes.

[donevwil]

I think your best bet is to simply buy new wheels.

[Louis]

I think your best bet is to simply buy new wheels.

Or one of these:

https://www.tts-international.com/on/demandware.static/-/Sites-TTSGroupE-commerceMaster/default/dwc9cac084/images/large/1010943_00_MA03071_1.jpg

[FriarQuade]

Measure the circumference, divide by 3.

[Dino Suegiù]

For the tools and effort. I’m going draw a line halving circle then draw another line perpendicular at 1/4s the distance of the drawn line. Where that line insects should do it. Almost as good as counting spokes.
Seriously?

Just draw a line, say 8" long, on a 8.5x11 sheet (if you want bigger, go bigger).
Mark one end "A" and the other "B".
Mark the midpoint, at 4".
Draw a second, perpendicular line, a bit longer than 8", up from the 4" midpoint.
Place your ruler end at "A" and incline-rotate the ruler until 8" bisects the vertical line. Mark that point "C".
Connect points "A" and "B" to point "C".
You now have constructed an 8" equilateral triangle (black below), so of course all the angles are exactly 60°.
Draw an exact second equilateral triangle on another sheet of paper.
Tape the 2 sheets together along one side.
You have now constructed a double equilateral triangle (red + black below) and you know the obtuse angle is exactly 120°, which you can now transfer to your wheels.

1 pen, 1 ruler, 2 sheets of paper, some tape, 5 minutes...no compass, no protractor, no internet, etc.

http://jwilson.coe.uga.edu/EMAT6680/Parsons/MVP6690/Unit/Hexagon/Images/image25.gif

http://jwilson.coe.uga.edu/EMAT6680/Parsons/MVP6690/Unit/Hexagon/Images/image26.gif


But, for decals, just do what FriarQuade wrote, which is close enough and much faster, and be done with it.

[joosttx]

Seriously?

Just draw a line, say 8" long, on a 8.5x11 sheet (if you want bigger, go bigger).
Mark one end "A" and the other "B".
Mark the midpoint, at 4".
Draw a second, perpendicular line, a bit longer than 8", up from the 4" midpoint.
Place your ruler end at "A" and incline-rotate the ruler until 8" bisects the vertical line. Mark that point "C".
Connect points "A" and "B" to point "C".
You now have constructed an 8" equilateral triangle (black below), so of course all the angles are exactly 60°.
Draw an exact second equilateral triangle on another sheet of paper.
Tape the 2 sheets together along one side.
You have now constructed a double equilateral triangle (red + black below) and you know the obtuse angle is exactly 120°, which you can now transfer to your wheels.

1 pen, 1 ruler, 2 sheets of paper, some tape, 5 minutes...no compass, no protractor, no internet, etc.

http://jwilson.coe.uga.edu/EMAT6680/Parsons/MVP6690/Unit/Hexagon/Images/image25.gif

http://jwilson.coe.uga.edu/EMAT6680/Parsons/MVP6690/Unit/Hexagon/Images/image26.gif


But, for decals, just do what FriarQuade wrote, which is close enough and much faster, and be done with it.

Yes, two lines one measurement

[Dino Suegiù]

Yes, two lines one measurement

Yes, same result in the end (120° angle), but I thought you previously wrote that you did not have a compass to use, to draw the circle with?

[joosttx]

Yes, same result in the end (120° angle), but I thought you previously wrote that you did not have a compass to use, to draw the circle with?

the wheel is upside down but you can see what im doing.

https://live.staticflickr.com/65535/48709173601_29d210be54_b.jpg

the results are good imo. but i ended up removing them

https://live.staticflickr.com/65535/48708833478_f091b91128_b.jpg

[ergott]

24 spoke wheel. 3 groups of 8 and you have your thirds. Just center decal to each "gap" of relatively parallel spokes like you see at the valve.

No measuring or calculating anything.

[joosttx]

24 spoke wheel. 3 groups of 8 and you have your thirds. Just center decal to each "gap" of relatively parallel spokes like you see at the valve.

No measuring or calculating anything.

excellent! This is the winner. So I was a little off. :)

[adub]

Lots of overthinking in this thread..

[Dino Suegiù]

Lots of overthinking in this thread..

Including perhaps the original premise, in that with those big logo Racing Rays the rims might really look best logo-less (like in the photo with the board contraption). Or at most just the one opposite the valve? Sometimes simple is best.

[joosttx]

Including perhaps the original premise, in that with those big logo Racing Rays the rims might really look best logo-less (like in the photo with the board contraption). Or at most just the one opposite the valve? Sometimes simple is best.

That’s what I ended up doing . I thought maybe black logos would work. They didn’t. Logo less again.

[Louis]

You could always go with custom paint or decals for the rims ;)

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcT7sUOJxt1sAyqnENr9i34Fk24uIMrPL G-Y74wHTYNo4qrPnIm5

https://www.slowtwitch.com/articles/images/9/135669-largest_HJackson15KonaB2.jpg

https://cdn.shopify.com/s/files/1/2094/8901/files/unnamed-10_1440x640.jpg?v=1497542925

https://www.kanebikes.com/wp-content/gallery/mtransition/Specialized-Transition-Custom-Bicycle-Painting-_-hed-wheel.jpg

https://p.vitalmtb.com/photos/users/34597/setup_checks/28563/photos/37371/s780_camber1.jpg?1427204610

[joosttx]

:eek:

You could always go with custom paint or decals for the rims ;)

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcT7sUOJxt1sAyqnENr9i34Fk24uIMrPL G-Y74wHTYNo4qrPnIm5

https://www.slowtwitch.com/articles/images/9/135669-largest_HJackson15KonaB2.jpg

https://cdn.shopify.com/s/files/1/2094/8901/files/unnamed-10_1440x640.jpg?v=1497542925

https://www.kanebikes.com/wp-content/gallery/mtransition/Specialized-Transition-Custom-Bicycle-Painting-_-hed-wheel.jpg

https://p.vitalmtb.com/photos/users/34597/setup_checks/28563/photos/37371/s780_camber1.jpg?1427204610

[Dino Suegiù]

That’s what I ended up doing . I thought maybe black logos would work. They didn’t. Logo less again.

Yes, I think the simpler really does look better, esp on big logo tires. Nice wheels.



No comment on "Green Hornet's TriTriTri Mean Machine" or "Lil' Richard's Kustom Tutti Frutti Ride", etc. above, yikes....

[prototoast]

1) Measure the diameter, D
2) An equilateral triangle inscribed in a circle will have sides of length S = D*sqrt(3)/2 (proof is left as an exercise to the reader)
3) Place the first decal, then measure a point S distance away from the edge of the decal that intersects with the edge of the wheel, place second decal here
4) place the third decal S away from the second decal

No measuring angles, only distances.

[tuscanyswe]

Late to The party

[donevwil]

Late to The partyConsider yourself fortunate.

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