Does anyone know what the differences are, other than appearance, between these wheels, please? Do they have the same offset? What’s the weight difference?
These are the specs I have for the NC1 17" wheel:
| Wheel | Diameter | Width | Tyre size | Tyre spec | Offset | Centre bore | Weight | Bolt pattern |
|---|---|---|---|---|---|---|---|---|
| NC1 10 spoke | 17" | 7" | 205/45x17 | 84W | 55mm | 67.1 mm | 7.7kg | 5x114.3 |
Thanks 
Just to clarify what I’m looking for:
Not really an answer, but if you are looking to chose between the two, then get later ones. I have heard stories of earlier wheels break the centres when on track
Someone has just weighed one from an NC3.5 for me. I don’t know how accurate his scales are, but he measured it at a disappointing 9kg.
Perhaps they are heavier because they’ve been strengthened to avoid breaking the centres? This is the first I’ve heard of this. If it’s uncommon, I think I’ll be inclined to take my chances, given the significant weight difference.
Meant to say that they will mostly be used on track. I already have two sets of NC1 wheels; one set with road tyres, and another set with A052 semi-slicks. I need a third set because of the way I’m trying to make the most of a growing pile of A052s that don’t have enough tread left to use on the road.
They will be the same for both wheels.
I would also be surprised if the weight you have is correct at 7.7Kg
I’ll remove a tyre in the morning and weigh one myself. I can’t recall where I got the 7.7kg weight from.
I’ve just weighed an NC1 17x7 10 spoke wheel, with tyre, valve and balancing weights removed. I used two sets of scales, neither of which are anything special, but one said 7.7kg, and the other said 7.8kg. I think 7.7kg is correct.
