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Re Spitfire soft wheels
They just brought out new / improved Spitfire 80HD wheels, which have more a hex inside core on them, but I don't recall the media blurb info I saw with them.
For me the older ones worked well enough, but compared to some other wheels where I could really push into carve turns, if I did that too hard on Spitfire 80HD wheels, they would almost tip over or feel like they were mushing out, but I never had the core come apart or the wheel surface chunk out a lot, even though I had seen others with all brands of wheels in pieces, including those Spitfire 80HD wheels.
I still have a few sets on boards and they are a good cruiser wheel for smaller setups or boards I know I am not going to go too hard on, but I almost think if they were a bit more in the 85 - 88 range, they might work a bit better, even though that is bordering on normal soft wheel territory anyway.
The Spitfire Soft Ds in 92 duro are still my go to for softer wheels I can still skate like normal when needed, but I did stock up on them before they discontinued them, the 54 and 56mm sizes in particular.
I have others in 92, 95 and 97 duro which are good for other things as well, but being the original formula, they come with their own issues, but at least I don't slip out skating them on slippery ramps or when I just want a softer wheel for whatever reason.
For anyone wanting decent wheels, sure the Bones Dragons and other softer mixes are out there, but some of the Mini Logo wheels in both 90 and 95 duros are really good too, still able to hold speed better than most soft wheels and don't feel like a soft wheel, apart from the grip.
They are also fairly cheap and very easy to get, or at least the ones I have seen around anyway.