First, you buy an iPod Nano, then a Nike/iPod Kit and then (optional, but important) an armband to hold you ipod and Nike+iPod. By this time you've already spent $250+ and nike/apple tells you that you can't use the Nike+ kit without their special shoes.
To hell with that!
There are many options out there that will help get around buying Nike's special shoes, but for those of us who run outdoors, and run long distances, we just don't feel safe mounting it above the shoe (at least I don't). So why not just model my current running shoes after Nike's special shoes?
NOTE: This Instructable involves cutting a hole in your shoes. I am not responsible for any damaged shoes, injured legs, cut fingers, or broken Nike+ kits. '
All of the instructions are detailing how I did this, how you should do this depends on your shoe, shoe size, and preferences, but it should be mostly the same (just different measurements involving sensor placement)
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Step 1: Tools/Hardware Needed:
Foam Core/Mat Board X-Acto Blade (optional, but helpful)
Step 2: Measuring
Start by measuring the sensor and your shoes. The sensor is approx. 1/4" deep, and it will be going inside of your permanent soles, so make sure that your shoe can comfortably fit.
My measurements are (you should measure your own to double check my measurement):
1 3/8" x 15/16" x 1/4"
Step 3: More Measuring
After pulling out the removable sole at the bottom of the shoe I traced it to find the size. Then I took a look at my foot's arch to see where it would sit best without my heel or toes smashing it down.
With my foot I had about 1- 1/2" in depth of area that my arch was raised. Obviously while running this will change, but this seems like one of the best spots for minimal pressure and stress.
Step 4: Placement Ideas
After measuring my arch and sketching it out I looked for placement of the sensor. You don't have to necessarily do this step, but it made me feel more comfortable with the placement.
Step 5: More Measuring, More Cutting
I went ahead and figured that the sensor would be placed at 4 7/8" from the back of the shoe (measuring on the inside).
I cut a strip of paper out at this size to fit into the shoe, because I don't have any rulers that will fit inside of my shoe. After placing the strip inside my shoe I marked the first corner.
Step 6: How Much More Measuring?!
I went ahead now and took another piece of paper, measured it and cut it to the size of the sensor, and traced it inside of my shoe.
The dimensions for the sensor are 1-3/8" x 15/16" (ignoring depth for now).
For my shoe, the easiest way of tracing it on was using a thick pen (.8mm).
For those of you not happy about having to write on your shoes, consider that in a few moments you'll take a Dremel and X-acto to them, and that the pen should be the least of your worries.
Step 7: Cutting!
I played around with several different methods for cutting the hole where the sensor will rest. Depending on your shoe, some techniques will work better than others.
What I did here was take a foam-core x-acto blade and set the blade out to 1/4" (depth of the sensor). I went inside of the shoe and scored across the midpoints of the square to determine the depth.
Step 8: Now the Fun Part
At first I started with an X-Acto blade (standard type) to cut the oval shape out.
That didn't work well though, granted it got a lot of pieces out, but it was choppy and difficult (cutting through rubber).
So using my Dremel with sanding bit I went in and sanded out the whole.
Keep in mind here you are NOT cutting out the entire square drawn, but just an oval shape that fits within it. Do NOT cut a square. Seriously, you'll ruin your shoes (more so)
As far as the curves of the sensor went, it was more a matter of estimating. Someone with extra time could probably go and measure the radius's, but for me it was more a matter of starting smaller, and testing by trying to put the sensor in.
The cut marks made earlier (optional step) are nice because they'll give a rough estimation how far you should sand down. Also they help to ensure that the hole is flat at the bottom. If you didn't do that step, you could probably just do it carefully by checking the depth very often.
Step 9: Placement/Finished!
Hooray! After about 30 minutes of work, a lot of measuring, and some sanding with a Dremel, your sensor should fit (if you measured correctly). Before you're completely done, make sure to check and double check the depth of the sensor when in the hole. In my case, the sensor rested about 1/16" below the rest of the padding. It's also a smart idea to put in the removable sole and walk around in the shoe to make sure it feels alright (as far as depth goes). In my case, I couldn't even tell it was there.
Clean out the dust, and make sure the sensor fits snug. It should not move around within it's hole or you'll get inaccurate readings. Place the removable sole over the sensor and you're set.
Nike does recommend taking the sensor out when you're not running to save on battery life. For someone like myself who runs a lot, these are strictly running shoes, so I don't have to worry about that. I can't say what the shoe would feel like without the sensor in place, so if you plan on removing it you may have to mod a small piece of rubber to fit in the hole.
Step 10: Results/Testing
I went out right afterwards and ran a quick 3 miles to check timing/distance.
At 3 miles (according to the Nike+) I ran 20:07
Using Gmap-Pedometer, I checked my distance and got 2.9873 miles.
About 1/100 of a mile difference. I'm impressed!