Well the difference isn't big, it matches pretty good over here. I don't understand why it wouldn't add up? I maybe get a 10gr difference adding the two compared to the total weight. I think it has more to do with inaccuracy of placing the car (when flipping around).
Recently I simply bought a second scale so the front and rear each have their scale. When I add these numbers, it is exactly the same as the total weight when putting the car on one scale only.
Of course the weight is different while driving, but this setup gives you a good idea for adding lead to your car. I presume you agree that it is different to place 150gr of weight on the front or on the back of your car...
And even if it's only theoretical in this static setup, I made that weight plate because I noticed the small rear weight % on the cr2, and now my car feels 100 times better :-)
Can't wait to test it on dirt tracks, but I'm 99% sure that the effect will be massive.
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