I'm sure they are even if they appear similar on the outside. My son is running my old Stroker Trails on his Bullit now (after I got a couple or three seasons of DH riding/racing on them) and they're still strong as ever. They were a vast improvement over my HFX Mag HDs. My Primes are amazing and just as powerful, if not moreso, than my 4-pot Sroker Aces. Dunno how they did that, with a contact area more like the 2-pot Strokers; and that poppet valve adjustment is ideal for my small hands. I can adjust a short reach coupled with early-stroke activation and run my levers inboard for one-finger braking even on steep-n-deep DH runs.

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