Wheels: Sp12 v's Spider weights

[a1rak]

Bit of useless info for everyone if they are considering changing wheels,

I have a set of SP12 with new avon ZZR track tyres on and they weigh:
Front (225.40.18) 22Kg, Rear (265.35.18)24kg

compared to Spiders with new P Zero tyres:
Front (235.40.18) 24kg, Rear (255.35.18) 26kg.

So an 8kg saving on weight. I think as this weight saving is on the rotational masses someone on here will come along and explain that its worth more than the actual 8kg dead weight reduction.