Originally Posted by
carpediemracing
I posted it as a reference, it's surprisingly light. When I weighed it I tried to include everything I'd need to use it. The rings are a bit light, I think, and the aluminum bolts screwing into the small ring is nice. I'm using a Praxis outer with the stock inner right now (finally got rid of the 44T inner so it no longer rubs the chainstay).
yes, <600 for the whole thing with head unit is pretty light. i suspect much of that is the rings.
DA 53/39 rings (7900 series) are 148g w/ bolts. (50/34s are actually heavier @ 155g. Guessing the larger rings had more material removed from the inside.)
PC7 head unit is 77g. A standard SRM is 169g vs 110 for a compact. The newer spiders have more battery capacity so I think they might weigh a bit more than the older ones. Maybe.
Still...I'm guessing those rings and bolts are fairly light.