Interesting thread. Anyone (engineers perhaps) shed any light on why someone on cgti has said that you should have your spacers cad drawn and made by engineering shop ?? (other than the apparent need for anyone doing diy on cars to heavily over-engineer everything they do). I've got lots of 10mm plate, a cutting disc on an angle grinder and a pillar drill ... am I missing something or will I be able to knock these up for free? Cheers
Main problem here is making sure they are properly flat to make sure the wheel bolts apply even pressure on the mating faces and to stop the wheel running out (if between the wheel and disc anyway). If you can get them flat then you may get away with it but ideally you would want them to be hubcentric once over a few mm thick anyway to make sure the wheels are concentric to their mounting spigot which is a problem you wont be able to overcome using your method unless you can file holes perfectly round and you wont be able to replicate the wheel bore spigot to keep the wheels concentric either. No real need for cad use, sketches are fine but yeah, personally I would not touch spacers between the wheel and disc that had been bodged up by hand as there are too many things that can/will be wrong (and I havent mentioned balance). Much better to get such things machined by someone who knows what they are doing.
To whoever mentioned fitting 30mm spacers between wheel and disc, thats not generally a very good idea, although in this case they will not increase the loads on the bearings due to the OP's wheels offset. Personally Id do as the OP wants to and space the axle out (assuming the rear disc/calipers will clear the wheel!) to make up for the offset as its fit and forget, less to go wrong (spigots and bores) and a damn sight cheaper.
