If wanting to run a 2x10 crankset with 104/64 BCD is it better to convert a SRAM X9 39/26T with 120/80 BCD by converting the spider to 104/64 BCD? Or is it better to just get a SRAM X7 S1400 38/24T already setup as 104/64 BCD?
Reason I ask:
- I'm new to 2x10. Coming from a 3x9 setup with 44/32/22 front and 11-34 rear. Though I used my middle ring 80% of the time, when I needed my granny I used every last bit of it. Which is why I want the flexibility on a 2x10 to run lower than a 26T if needed.
- I got a smokin deal on a brand new X9 39/26T with GXP bb. So I already have that. It looks like I can pick up a North Shore Billet or SRAM spider to convert the X9 to a 104/64 BCD, then pick up some rings to match.
- I also got a "good" (not smokin, but good) deal on an X7 S1400 38/24/Bash, 104/64 BCD. So I can basically choose which one to go with then sell the other.
For the rear derailleur I'm planning to run a SRAM X9 10-spd Type 2 medium cage, paired with a SRAM PG1070 11-36 10-spd cassette. My front derailleur is a SRAM X7 direct high mount.
So my question really is: would converting the X9 yield any substantial benefits over the as-is X7? Is an X9 crank noticeably different than what is on the X7? Anything else I should be considering?
Thanks in advance.
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