Spindle bearing spacer

And that’s the thing you have to ask yourself when you see stuff like that. How many places behind the decimal point is it in hp or mpg is it? What does it actually DO? Because a 1200% increase in “wheel spin” is basically meaningless, that’s marketing BS. And if that’s the claim they’re making, you can bet it doesn’t do much.

Because if it freed up 5 hp they would say that. If it added 1/2 a mile per gallon they’d say that. But we get “wheel spinning” as the “measurement” for improvement. So, that means it doesn’t do much of anything.

And if you’ve set wheel bearing pre-load then you know that a little difference there can make a pretty significant difference in how easily the rotor spins. But there’s a spec for pre-load, and it’s not based on how many turns the rotor will spin. It’s on end play, which is what’s actually important for the bearing.