So the first thing you're going to need is a caliper! Digital calipers work the best because they provide a much more accurate reading for measurements. You'll soon learn that a caliper is probably one of your best friends in RC. You're also going to need a flat surface that doesn't bend easily. Here I'm using a hard paper box.

1st Step: Measure The Rim Width For The Middle Measurement:



Using your caliper, measure the entire width of the rim. In the picture above, we've measured it to be about 26mm. Then divide that by 2 so that you can get the half way point measurement of your tire. So in the example, since it's 26mm, 26 divide by 2 is 13mm.

2nd Step: Measure The Depth Of The Mounting Hex Slot:



Next step is to measure how deep your inner mounting hex is. Using the flat piece of material that you've gotten (which in our case, was this box), we measure the depth of the hex by placing the box over the rim's inner side, and measuring the distance. You can look at the image below for our results (which was about 26mm)



Since the measurement taken (26mm) include the width of the box that we used, measure the box's width and subtract that from the total. (In this case, the box was 15mm). So, 26mm minus 15mm is 11mm.



3rd Step: Calculate The Offset

Since the final reading that we got was 11mm, you subtract that from the original 13mm middle point that we measured in the first step. 13 - 11 = 2. This Team Tetsujin Super Rim that I had on this setting was at a negative offset of 2mm, so 2mm is the measurement we got! Negative offset is dictated by whether your hub mounting surface's depth is smaller than the middle point of your tire.

If you have any questions, please let us know in the comments below. For any other sort of RC Basics that you're interested in learning about, please email us at editorial@asiatees.com!