Piston Slap: A Primer on Wheel Offset and Backspacing

Long-time TTAC Commentator 86er writes:

Hi Sajeev,

Could Piston Slap furnish me with a be-all/end-all explanation about wheel offsets? The more I try to read up on it on the web, the more confused I get. I’m pretty clear that RWD (at least traditionally) went with the low-offset while the FWD revolution made high positive offsets the industry standard, at least in passenger cars.

A few years back, I had purchased a set of winter tires on rims for my trusty ol’ 92 Vic and later after research found out that the rims were medium-offset that went on a 4×4 Ranger of similar years. I’ve heard that putting on a different-offset wheel can hurt steering/suspension parts like ball joints, but I’ve never seen it in black-and-white, so to speak.

Read more
  • 2ACL If I'm going to battle 30-year-old BMW problems, then the car had better be representative of their greatest hits. I hear the M42 is a decent motor, but it just doesn't personify BMW excellence of the period. Also did some digging in the seller's other posts to try and determine the transmission type. . . https://www.bimmerfest.com/threads/m42b18-1994-318is-misfire-hopefully-remedied.1443915/page-2#post-13810336"Test drive was magnificent, for an automatic, it eventually gets up to speed." Free-revving four + four-speed slushbox = pass.
  • SCE to AUX This is good news, as long as the Tesla plug can deliver the kind of power needed in the future. I'm not sure that's a settled matter.
  • SCE to AUX Hyundai/Kia/Genesis, if we're talking mfrs of consequence in the EV space.But to their credit, they've tried to remain distinct from the Tesla approach to everything. They've been quick to respond to the Biden IRA domestic content stuff for EVs (by building more US plants), so maybe they'll jump on this NACS bandwagon.
  • FreedMike I guess it's good to hear they finally made the third row livable - the one on the old RX was a joke - but, man, is this generic-looking.
  • Alan I read the front wheels are driven by the engine and the rear wheels by electric in the hybrid. I also find it odd it isn't offered as the 2.4 hybrid with 250kw on tap.