I believe the yellows are 92a (slightly softer than 95's) and the reds (slightly harder than the 92's) are 95a. Not a whole lot of difference. Typically the reds are standard on the 150's and the yellows on the 180's.
the reds and yellows are different duros on purpose. I submit that the reds (come stock on every set of 150's I'VE seen) are harder mostly in part to the fact that you have more weighted leverage on a smaller axle truck, so a harder bushing feels softer at that length.
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