bolt on wheel spacers, gd idea or not?

[roadsailing]

Ed is right, anyone disagreeing is wrong.

Not that it proves the point, but I am running the second set of nissan wheels on my sprinter (nissan centrebore is way bigger than toyota) and have had exactly zero wheels break off.

Friction is what holds the wheels on the hubs, not centrebore.

[oldcorollas]

what if you have loose wheelnuts?
perhaps the centrebore thingy is to save silly punters who forget to keep their wheel nuts tight?

[af300e]

The hub centric design allows the wheel nuts to be torqued individually whilst maintaining alignment ie: as each nut/stud is tightened, there is less chance of the wheel being "pulled". With a spacer, this is very important as there are two faces at which misalignment can occur. This is less chance of this if the studs pick up both the spacer and wheel, that is, longer studs (as I suggested earlier).

I have confirmed this with an engineer.

It is impossible to argue that hub centric is not an advantage when, as mentioned by Ed, the spigot only holds if the wheel can move. The advantage, apart from the alignment issue, is that the chance of movement is lessened by the spigot centering.

[roadsailing]

agree with you totally af300e! i'd take matching centrebore any day of the week, and long studs are a better idea. Proper offset wheels are even better as has been said.

[af300e]

agree with you totally af300e! i'd take matching centrebore any day of the week, and long studs are a better idea. Proper offset wheels are even better as has been said.

Thanks! Of course, proper offset is the best. But cost is sometimes prohibitive. I make my own spacers if I need them

[ed]

yup, wont see me disagree with hub centric design from an alignment/security perspective. particularly if you are assembling a big sandwich

the day they make a spacer with the same integrity as the hub flange itself, then ill take a look (perhaps). annodised blue alloy make me run the other way.

[SillyCarS]

withdrawn, nevermind

[TERRA Operative]

I hope your right, otherwise when my crappy 1ggte propels my junk missile to 200km/h and the decelleration force (is more than 5 x greater than gravity just to pull up within 200m) is greater than when the car is sitting still, the studs would surely shear off! Not worry though, the steel-steel friction force of the hub-wheel surface will surely kick in just in time before the whole fkn lot goes boom...

terra operative

Hey?

I'm not advocating for the reliability of the friction created between two clamped surfaces, nor the shear strength of wheel studs in said application.

Oh, and accelerating your car from standstill to 200kmh, within 200m will impart a force of no more than 1.13 tons to all 16-20 wheel studs for a little over 9 seconds. (Assuming a vehicle mass of around 1300Kg). Which is about right assuming you have good tyres with a static drag coefficient of about 0.8 and no wheel spin.
If your car really imparted 5g's, you would be at the edge of blackout, as the human body can only withstand 5g's perpendicular to the spine for 10 seconds ('eyeballs out' as it's termed).

You are actually experiencing about 0.8 g's in the above scenario.


Learn to calculate...... FAIL.


I'm not arguing that braking or acceleration will kill the studs, it's constant shock loading from bumps and irregularities in the road. Stress fractures will occur, eventually leading to failure of the studs. When the wheel is supported by the hub centre, the shock that would otherwise be transferred through the studs, is transferred through the hub, preventing the studs from stress fracturing.

[SillyCarS]

withdrawn, nevermind

suck it and see

[brett_celicacoupe]

the hub centre only takes a load if the friction force of the hub face is overcome.

the studs only experience a shear force if the friction force of the hub face is overcome.

no more than 1.13 tons

you failed to consider the acceleration wont be constant.

[TERRA Operative]

you failed to consider the acceleration wont be constant.

Well, generalisations had to be made...

[ed]

let me complete the following sentence for you:

When the wheel is supported by the hub centre....

....it means my studs and/or my wheel/hub assembly has failed



just doesnt happen dude