Quote:
Originally Posted by DoughtyUK.net
they stop the whole thing from flopping around 
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Couldn't have put it better. We live in a 3-dimensional world, so you need 3 x 2 = 6 links to hold any object fixed in space. But for a wheel, you may want to replace one solid link by a damper and spring. So that's 5 links left.
Any less and it flops around.
Performance is great. Lots of grip. And it's a reliable kind of grip. Feels very nice especially when the track is made out of differnt materials - like cobblestone patches. First couple of batteries I was on the same pace as with my regular X-6.