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branwen-
Sorry, yeah, the Si Hollowgram is pretty light, probably a smigeon lighter than an FSA SLK setup - as long as you use an OPI single direct mount ring. Way ahead in terms of stiffness and radness.
The Si SL2 Hollowgram will be much lighter, but spendy spend spend.
Howard
There's an Si Hollowgram crank for sale on 'ere.