Thread: Rim Options for D1/2/3/4?

If the 12" hubs were Defender/RRC pattern and then you fitted RRC to D2 adaptors, the boss may still be too large for the D2/P38 rims. Someone fitted RRC to D2 adaptors but IIRC to 10" parallel hubs. You would need to check the 12" boss OD to see if its greater than the D2 centering hole diameter.

If the D2 rims fit you then have to account for the adjusted offset to determine the required axle length.

PS 12" hubs cannot be drilled for D2 pcd as the bearings are too large.

The boss (spigot) can be turned down enough to fit D2 rims on parallel bearing hubs without affecting their integrity. But you need a 16mm spacer to bring them out far enough.

Re: legalities of spacers on trailers, it's perfectly legal as far as I can work out. As the rules state that spacers are illegal "unless factory fitment". So if you build or modify the trailer yourself then it's a bit of a loop hole...

10" brake parallel bearing hubs - yes, I've done it for X5 rims, but not 12" brake hubs.

Originally Posted by gavinwibrow

I know that my D1/RRC rims do not fit my D2a/P38 studs or vice versa, but thinking ahead for resale options etc for the van, what is the story for D3 and D4? Apart from using larger diameter rims, are the D3/4 centres compatible with D2a/P38? I suspect not, but it might help me make a decision if so.

L322/D3/D4/RRS wheels will bolt straight onto to a D2/P38A IF one uses hubcentic rings and the right wheel nuts.

I've got RRS rims on my P38A.

See, for example, Spigots Allows L322 Disco 3 4 Range Rover Sport Rims TO Range Rover P38 | eBay

Really you are limited by what ALKO and the caravan chassis manufacturer offer vs the weight of the caravan.
If the caravan can take 9 inch drums with Holden or Ford bearings AFAIK you could have them drilled in D2/D3/D4 pattern. AFAIR these hubs are rated at 1000kg per axle vs parallel at 1500Kg.
If the caravan needs 10 inch drums and you are limited to parallel bearings because of the weight/chassis manufacturer/ALKO catalogue, you cannot fit D2/D3/D4 alloy wheels because of the large size of the bearing housing vs the size PCD of the wheels. ALKO do offer D1 pattern drums.

Even after the taper of the bearing housing it is bigger at the end cap than the wheel centre hole. This is slightly better on a D3/D4 rim but there is no way a D3/D4 rim will fit against the drum.
As on previous threads I have drilled my parallel hubs as D1 and used ( expensive) adapters to fit D2 rims and even then I had to "machine" the inside of the hub adapter to allow the adaptor to fit over the cap of the parallel hubs. The adapters came with D3 hub centring so I had to machine the hub centre ring off the adapters to fit D2 wheels.
Spacers/adaptors are only illegal if they are retro fitted . If fitted by the manufacturer they are legal. Lots of Porsches have spacers.
So good luck in convincing the caravan Chassis manufacturer to to offer D1 drums with D3 adapters if parallel bearings are the only ones suitable. The adapters are about 30MM thick or so but the difference in wheel offset between a D1 and D3 wheel brings the track increase down to about 15-20MM so this would have to be planned for if going that route.
Regards Philip A

Originally Posted by PhilipA

Really you are limited by what ALKO and the caravan chassis manufacturer offer vs the weight of the caravan.
If the caravan can take 9 inch drums with Holden or Ford bearings AFAIK you could have them drilled in D2/D3/D4 pattern. AFAIR these hubs are rated at 1000kg per axle vs parallel at 1500Kg.
If the caravan needs 10 inch drums and you are limited to parallel bearings because of the weight/chassis manufacturer/ALKO catalogue, you cannot fit D2/D3/D4 alloy wheels because of the large size of the bearing housing vs the size PCD of the wheels. ALKO do offer D1 pattern drums.

Even after the taper of the bearing housing it is bigger at the end cap than the wheel centre hole. This is slightly better on a D3/D4 rim but there is no way a D3/D4 rim will fit against the drum.
As on previous threads I have drilled my parallel hubs as D1 and used ( expensive) adapters to fit D2 rims and even then I had to "machine" the inside of the hub adapter to allow the adaptor to fit over the cap of the parallel hubs. The adapters came with D3 hub centring so I had to machine the hub centre ring off the adapters to fit D2 wheels.
Spacers/adaptors are only illegal if they are retro fitted . If fitted by the manufacturer they are legal. Lots of Porsches have spacers.
So good luck in convincing the caravan Chassis manufacturer to to offer D1 drums with D3 adapters if parallel bearings are the only ones suitable. The adapters are about 30MM thick or so but the difference in wheel offset between a D1 and D3 wheel brings the track increase down to about 15-20MM so this would have to be planned for if going that route.
Regards Philip A

X2, what Phillip says, been there done that myself, I had D2/P38 on my camper with the D2 and BMW X5 rims on my camper with the D4, tried to fit D3 rims to them when I managed to score 3 extra D3 rims, but they won't fit because the D3/4 rims are tapered, so I went to steel rims, I can use the steel rims on the car in an emergency, if I need too, I was hoping if I went to 10" braked hubs, the X5 rims would just fit without buggarising around, but alas no, so when I do go electric brakes, the steel rims will do.

Baz.

10" drums are available in the SL/LM bearing set as well as the parallel bearing set and are a lot more common than 9" drums.