Technical Drum Brake Axle Hub Register

Hi Guys

Part way through my model a build and have just installed new axles and wheels.

The is a difference in the diameter of the wheel opening and the diameter of the drum brake pilot.

I have been getting mixed feedback. Do I need to have a shim made up so that the load is taken by the axle, or does this not matter with a Model A and the wheel studs have enough capacity to carry the load?

 

I would use a hub centric ring on there. You can buy them of the shelf over here so would have thought you could over there.

 

You will get mixed feedback here as well.
The stock model A weighs 1 Ton and the wheels are held on with 20 half inch bolts. Do you think thats strong enough?

Unless the rings are fitted to the hub and wheel with no clearance whatsoever they will not take any load when the studs are bolted up.

 

I don't think loading is an issue. More important is assuring the drum ID is concentric with the axle and brake shoes.

A ring would be my recommendation.

 

A hub centric ring allows the wheel to self Center on the hub .

without the hub centric ring you rely on the lug nuts to Centre the wheel .

6 of 1 , 1/2 dozen of another .

I prefer hub centric wheels or adapter rings but they don’t really benefit the entire thing a whole heck of a lot .


Point is , don’t loose any sleep over it .

 

It's hard to tell if the hub is even sticking out far enough to support a spacer ring. You're ok using it as a stud centric with the cone style lugs.

 

to me the drum looks like there is some air to the left, though it could be shadow

 

I make every single hub/brake/wheel combo hub-centric, except where impossible.

It is not just about load capacity, but also about concentricity, relative to operation at-speed.

 

If you're building a car based on modern technology, you need to have the wheel centered on the hub.

If you're building a traditional car based on old technology, you don't worry about it, and it's fine.

 

So, only drive it on old roads?

 

I would make or buy the correct spacers similar to what Branding showed. Drums and rotors need to be hub centric but wheels can be lug centric.

 

Yup, not a problem in most areas. Keep some old maps with you if you need reassurance that the road has been around a while. Works for me, I don't have hub centric wheels on either of my old cars, and the only issue I have is with the crappy tires they make these days.

 

Something is wrong!
#1, Were those axles redrilled with a different bolt pattern?
That could be the problem.
#2, could be poorly made after market rims .

 

If you are concernd about concentricity, bolt the wheels on then spin them to check for runout. If they are true to the spec of the wheels then all good. No need to overthink this one.

 

What do you think is wrong? Brand new axles, USA made wheels