Rear toe in woes

[MikeB]

As above I'd try and get the measure relative to the side rails as the rear chassis might not be true. I've welded my rear suspension mounts on but did check by assembling the upright, clamping the straight edge to the hub and seeing if it was roughly parallel with the side of the chassis, i had to swap the uprights over it then seemed relatively true, aim to shim it if necessary.

Very light rear toe-in on a road car will aid straight line stability and is what I would go for. Toe out at the rear will make it seems a little twitchy but should turn in really well.
I'm setting up a caterham superlight this year we have just had our first race at Oulton at the weekend, hence getting the hang of setting up these things (for the track not the road though)

We are investing in some shims to adjust rear toe in/out so will play with it at Snetterton