This post dedicated to Upsidedown:
Don't really get it, is one fake and one is the real deal so hence why the weight difference?
SL and just 'hollowgram' .. I think I have SL .. maybe
The heavier one is the original Si Hollowgram crank arm, the SL is the superlight version that replaced it.
I spotted that the cranks were not a pair when it was in the shop, but kept schtum as I didn't want to spoil anyone's birthday.
@HoKe started
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This post dedicated to Upsidedown: