I currently have a chinese carbon 29er frame with a sram 1x10 setup. The frame is BB30 and I am running a gxp crankset and BB with a Sram adapter sleeve. The crankset is from a 2011 specialized stumpjumper evo, which is called "Custom SRAM S-1250, 7050 alloy arms, 33t single ring, GXP spindle" which I do not know much about but when taken off the bike seemed surprisingly heavy.
My idea: The budget is limited, but I am considering swapping cranks to a BB30 x7 or x9 spiderless with either a HB spiderless ring or MRP when those are available. I have a HB ring currently on my SS which I could use, and replace that crank with the one coming off this bike.
I know because of that random and uncommon crank that came on my specialized this might be hard to judge, but do yall think the weight savings will be worth it? I have no idea what either way but in my hand the x7 feels lighter and with the adapter sleeve and gxp BB it seems like a good bang for the buck upgrade to switch to BB30. What do yall think? Anyone know the numbers on that crank?
FWIW the bike is chinese carbon frame/fork, bb7s, arch ex wheelset, fast trak 2.2's, x0 rear, x7 shift, specialized carbon bars, thomson post, phenom saddle and right at 21 lbs.
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Thread: Crank Swap Potential Weight Loss