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Ok. So I made a truing jig and built my new rear wheel. I got the rim dead centre of the hub so that when you flip it around in the truing jig it's in the same place. I just dropped the wheel into my specialized diverge and it isn't anywhere near centre of the rear triangle and is pulled over to the disc side. Anyone shed any light here as how I work out the correct dishing if centering the rim between the hub ends is not correct.
Thanks
The wheel should be centered between the axle ends, not the hub flanges. Your jig accepts the wheel with the axle in the wheel right? If so, just flip the wheel over in the jig and you should be able to find the correct dish.
Specialized used to be quite keen on offset rear triangles, it's possible that your wheel needs to be offset (less dish) to match your frame.
I think I may have figured out the issue 😮
I built the wheel with 142mm DT swiss caps and then switched them over to 135mm as they are for my road bike. I suspect that is the issue. I just assumed (wrongly) they would be the same?
Should be the same between 142mm and 135mm. The 142 is 3.5mm extra either side which sits in a recess in the frame. Dish wise should be identical.
Specialized used to be quite keen on offset rear triangles, it’s possible that your wheel needs to be offset (less dish) to match your frame.
I think you are correct as even with the switched caps it is only off by one mm, but in the frame it's about 4mm
I think I do now know what the issue is. I have a non SCS hanger on my diverge comp carbon and people have complained that although it allows you to run a stock 12mm 135mm axle the wheel will not sit centre of the triangle.
Very naff and I didn't know that.