At the rear, on the top (nearer the kingpin stopnut), go with a big barrel bushing, but you'll need to pick the duro with care. Too soft, and you'll 'mush' in pumped turns, or wob a tad at G.S speeds. Too hard, and you'll miss that offest cone, or start poppin' cones in tighter sets. Remember, though, that a slightly softer top can be 'dialed' by wrenching, but a too-stiff bushing will just 'stop' your turn depth and/or disrupt your timing. Better to err on a bit soft, and wrench it a bit stiffer.[Btw, some have found that a 'dead' bounce top combined with a 'lively'-but-stiffer lower bushing yeilds good pumping/turning while keeping wobbles at bay. McPherson struts, but at their simplistic minimum?] All of the above is why I prefer Seismic gen-1's with stiff springs as my rear truck...
Up front, taller is better, usually.Bouncier is great, dead+unbouncy is bad. Softer isn't always the answer, though, to turn resistance. Conical bushings can really make for an easily and rapidly turned truck up front, but I rarely run two conicals, as I want the truck to have a 'center return' that's fairly quick. Mixing duros is almost a given, as you'll now find that between Khiro/Bitch, Venom, Retro, Holey, and lathed Radikals, there's a huge range of bushings anywhere from 74A up thru 90A that might work up front. Personally, I'm usually running something in the 78A to 82A up front(Love Lt. Blue Trackers from the 80's!), unless it's an 'oldie' that historically requires Tracker TK-01 Rubbers or ACS orange bushings.Rubber always seems to have that 'feel' in deep turns, possibly because it can stretch a bu\it more than urethane. Oh, yeah, and as for 'hourglass' bushings, I never saw a use for them (Holey's excepted), as they 'cave in' and act very nervously, or like a softer-than-they-are bushing, but without the ability to deal with being wrenched on much. The worst, by far, was the GUS bushings, which actually interfered with the truck's turning behaviour. The softest (on the market now) are the white Bitch tall conicals or white Khiro barrels, though a few 'dance' rollerskate bushings might actually be softer (but likely not in production anymore). I haven't been on the new Retros, but have been on Retro wheel-cut bushings, which seemed to be a tad livelier than Venoms or Radikals. Of these, Khiro has my vote in Blue/Orange/White, while Venom's sub 83a stuff is very good, and Radikals that've been lathed in Clear or Red are as good as the old light-blue Tracker barrels or Holey hourglasses. Soft lathed-down Stims, well, don't do that to a Stim; go get Retros or Vemons instead, and put the Big Stims on your cruising board and Surf the turns...
