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I'm not sure there's been a Red crank that's lighter or stiffer than Hollowgram SL or SiSL2.
But the weight difference is tiny, with the red crank being 60g or so heavier. So might as well call it even.
Hollowgrams just look better, have detachable spider, cross compatible with MTB shiz and IIRC stiffer...might be wrong on that though.
And you can trace their lineage back to this
Which is kinda cool
spotter
Howard
@steve58
I was building a weight-weenie six-evo hm a couple of yrs back and without knowing the specs assumed the Sisl2 was going to be the lightest between itself and Sram Red, especially as it was £700....but when I looked...Red was about 50g lighter and half the price.
I never understood the big deal about Sisl2 and hollowgram.
Anyone care to enlighten me?