Thread: Offsetting disco steel

Can definately go -25 not sure if you can go much further though
cheers
Josh

Not sure what your figure -25 refers to....is this the final offset bias or the amount of adjustment???


I have comfortably gone 25mm increase in outward offset. I think about 30mm would be the maximum I would recommend. If you go futher than this you have to machine off too much of the rolled return of the centre, which would weaken it and reduce the amount of press fit contact area. Without this the rim works the welds and eventually cracks.....

Well, yes. -25 is final offset. Which would mean a total change of -58mm... Given that the original offset is +33

Either that or I could just change to 8" rims and keep the disco center

Originally Posted by popemobile

Not sure what your figure -25 refers to....is this the final offset bias or the amount of adjustment???


I have comfortably gone 25mm increase in outward offset. I think about 30mm would be the maximum I would recommend. If you go futher than this you have to machine off too much of the rolled return of the centre, which would weaken it and reduce the amount of press fit contact area. Without this the rim works the welds and eventually cracks.....

I will let the engineer make the call on the rims, was just trying to accertain if it is possible before I call him

Ahh, ok, if 58mm is the total change I would say that the method I used is not going to allow you to do that.


Look at doing a rim flip though and it might work nicely. Sure you get it but this is where the centre is removed and then the fliped over and refitted to the outer. You will need to weld up the hole where your valve stem was and redrill on the new outer side. Otherwise youll have your valve stems on the inside

There are 8 inch rims that offer about this offset with no need to remove the centres, in fact with an 8 inch you need this kind of offset or you run into inboard clearance issues.


My concerns with 58 mm change engineering from a drivability perspective ie scrub radius and king pin/wheel bearing loads etc. Although 110 (and county even more so) wheel bearings are HUGE overkill from an engineering point of view.
The main thing this offset will do is make the steering wheel KICK LIKE A MULE over potholes and bumps etc due to the extra leverage of the outboard wheels.

If its just a comp vehicle, why not.....Go for it....

I understand the complications of doing this mod with regards to bump steer (which is indeed what you are refering to). I will be running county salisbury rear and county front swivels and brakes if that makes you feel any better.. Might do the flip then. Might be easier. I like using the stock disco center for several reasons. One of which is no doubt the hub size. ie. it is the right size, unlike after market steel rims

You will need to flip them to change them that much.

Summerfield Engineering are the cheapest place I have found in Perth.

I have flipped rims on my IIA (done on the east coast). I have never had a problem, even running them at 7 psi, however in theory the inner lip (now outer) is not supposed to hold the tyre bead as well.

Originally Posted by isuzurover

You will need to flip them to change them that much.

Summerfield Engineering are the cheapest place I have found in Perth.

I have flipped rims on my IIA (done on the east coast). I have never had a problem, even running them at 7 psi, however in theory the inner lip (now outer) is not supposed to hold the tyre bead as well.

Thats the bloke I am chasing.. He has moved and has a new number. Will try him again