It ends up that the factory no longer sells them!! The part number does not cross-reference to any other Honda (Acura) hub!

So; Does anybody know if there are any other hubs that fit, but may have a different part number??

Wes V

I wonder if Tyson or Targa knows. I know that I read something about swapping hubs over in the RR/AX forum. I'll see if I can dig it up.

http://www.honda-tech.com/zerothread?id=824838

http://www.honda-tech.com/zerothread?id=992212

http://www.honda-tech.com/zerothread?id=913543

http://www.honda-tech.com/zerothread?id=1263038

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actually i dont know the answer myself. ive sold several sets, never actually used them.

i know ryan (rywire) will know. he's done 5 lug conversions for customers. that requires hub swapping, so he might be familiar with whats already on there and is compatible.

FS: Brake Prop Valves - 4040 $45 each SHIPPED

FS: Mugen CF-48 13x5.5 -38 Wheels *NIB*

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edit - i just need to pick up some DA caliper brackets, which i have planned for tomorrow, and i'll be able to mock everything up and tell you how successful the Si hubs are.

That is cool. However this has nothing to do with the subject Wes has posted.

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https://www.hondapartsdeals.co...B++27

maybe i'm confused then. I've got EX knuckles with Si hubs. Everything works. Isn't that exactly what he's asking for?

pictures on request... got everything put on today. the setup is:

EX knuckles, bearings, DA/EX rotors, caliper brackets, and calipers. Si/DX hubs.

For reference, the EX knuckles use the same small wheel bearing as the Si/DX/LX knuckles, and not the larger Integra wheel bearing - which is why the bearings and hubs don't have an SK7 part number. However, I'm not sure why they aren't listed as the SH1 (Si/DX/LX) parts.

Have you tried physically comparing the SH4 (EX) hubs with the SH1 hubs? Are there any dimensional differences that would pose a problem?

Additionally, does anyone know if the EX knuckles could be bored out to accept DA wheel bearings and hubs? I don't have any EX knuckles in stock to check, so I don't know if this would be possible.

Matta Motors - The Honda Car People

Targa250R; I'm real good friends with the local Honda Parts manager and he did a complete search for them.

As for comparing one against another, it's difficult due to the fact that the car is all together and I can't take dimensions off of the existing hub.

I also don't know if the inside diameter of the SI bearing (same as EX) is larger or smaller than the DA one. If the DA bearing has a larger inside diameter, then it may be possible to take a DA hub and turn it down to fit the SI bearing. I know this sort of thing is done when converting to 5 lug.

Thanks for everybody's input.

Wes or anyone when the answer to this is actually found please post the follow up info up so that we know. I say this in regards to the 5 sets of EX knuckles on cars that I will/have worked on for myself and friends.

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so here's the picture i took this afternoon... nearest i can tell, whatever differences there are between the Si/DX/LX hub and the EX hub, it doesn't affect the operation of anything. everything bolted up just fine, the rotor turns freely, etc. i'd be interested if someone found out why they're different part numbers, but i declare the two to be interchangeable.

^^ EX knuckles, Si hubs

FIXED

Modified by dr_latino999 at 1:35 PM 1/13/2007

I really don't see any problem in using the SH1 hub; it seems to install fine, and any dimensional difference would have to be in the diameter of the brake rotor backing plate (that the wheel studs are pressed through). Since the wheel studs and rotor screws locate the rotor - and rotors are also hubcentric so they sit on the lip in the center of the hub if you don't use rotor screws - I don't think it would pose a problem if it was different.

I'd go ahead and order SH1 hubs. Make sure to take pictures or measure dimensions when pulling the old SH4 hubs off and compare them to the new SH1s, so we can settle this discussion.

Matta Motors - The Honda Car People

Wes, what did you end up using in the end?

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I have purchased a SI hub, hopefully I'll have it at the end of next week for pictures.

Possible things that could be different would be the "offset" of the surface that the rotor bolts too. A difference would cause the rotor to sit further outward (or inward).

Another possible difference would be the center indexing section. In other words, does this match the ID that is present on the DA (or EX) rotor.

Things we can rule out; the bearing surface is the same (Si same as EX) due to using the same bearing. The lug spacing is the same (4X100).

I'd REALLY like to feel comfortable about ordering a set of SI hubs.

Who is "OMP" and do they have a cross-reference that can be used? Do they list an "EX" hub?

It's nice that steronz was able to bolt up everything (really gives me hope). However due to the fact that the caliper is a floating design, it would offset to match the rotor placement (not necessarily a bad thing). Also, in his photo, it doesn't look like the center indexing section is smaller than the hole in the DA rotor.

I REALLY approciate everybody's help!

Wes V

SI Hub vs EX Hub Top View

SI Hub vs EX Hub Side View

EX Hub inside 10.3" Rotor

SI Hub inside 10.3" Rotor

The only difference that I can find between the two hubs is that the face is smaller on the SI hub. I am now confident to say that the SI hub (44600-SH1-A00) is a suitable replacement for the EX hub.

OPM has hardened hubs available since the OEM ones are prone to letting loose in racing conditions. http://www.opmautosports.com/index.html

Hummm so the Si is a tad smaller. There is hope for good replacement.

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Quote, originally posted by Driven »

The weight difference is as follows: CRX Si (as shown) - 1.25lbs GSR (as shown) - 2.5lbs obviously, i have longer wheel studs on the GSR, but there's definitely more material on the hub. The larger hub is going to help keep the brakes cooler by not transferring as much heat from the driveline to the brake rotor... Bottom Line the CRX hubs are CHEAPER than GSR and easier to find. if you have GSR knuckles/brakes and want to use CRX hubs, i don't see any reason why you couldn't.

CRX Hubs seem to be quite the interchangeable replacement part it seems.

The smaller diameter on the SI provides less support for the studs (less material around the stud), but by no means is this a step backwards from what came originally on the car. In other words, the EX hub would be better if it was possible to buy them.

So, now I've got to find out how I can order beer over the internet.

Wes

This has been added to the FAQ so please make sure the pictures don't turn into red boxes.

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