Advice on a 2x10 setup for Spider 2
Howdy all. I have a question for any of you Spider 29er owners out there that do a lot of climbing (i.e.>45 minutes sustained/ride). Is a 39/26 a small enough gear for this bike or should I consider going smaller?
I'm building a Spider 2 29er from bottom up and need some advice on the crankset. I just got a smokin deal on a brand new SRAM X9 39/26 w/GXP 68/73mm bottom bracket and PG1070 11-36 10-speed rear. But in the course of looking at some smaller chainrings to keep on hand were I to find the 26T not low enough, I discovered going smaller than 26T on this crankset is not possible. The cranks I bought feature a 120/80 BCD, whereas rings smaller than 26T require a 104/64 BCD.
I'm coming to this bike from a Hammerhead 100x (essentially a 2000 Titus Racer X, 26" wheels, 4"/4" front/rear suspension) with a 44-32-22 front and 11-34 9-speed rear. I'd say 80% of the time I rode that in the middle ring, but when I needed that granny I used every last gear on it.
For this Spider, is it worth getting a different crankset with a 104/64 BCD so I can have the option to run smaller rings?
Do folks know if it is possible to convert a SRAM X9 GXP to run a different spider that'll accommodate the 104/64 BCD?
Is it necessary to go smaller than a 26T with this bike or does it climb well enough with it?
Thanks in advance!
Will answer my own question in case anyone searches for the topic in the future:
I ended up running a 104/64 BCD by taking the SRAM X9 120/80 BCD crankset and swapping spiders and rings with the SRAM X7 S1400. I feel it is the ideal setup for the Spider 29. Because the bike is such an adept, long-travel downhiller (I run a 150mm Talas 34 fork), I've found the need to do some substantial climbing to access the types of downhills this bike thrives in. Those climbs really do warrant the ability to go small in the granny.
Several folks I trust suggested this setup in order to pick up the stiffness and weight bonus of the X9 cranks but enable the smaller BCD pattern. With the lower BCD I can now run my granny as low as 22T, though I have it setup at 24T. With the 11-36 rear cassette that should effectively be the same gearing as the granny from my 9-speed with the 22T front and 34T rear.
Obviously this is a personal preference. I rarely spin the highest gearing available, so felt I needed more flexibility on the low end of the gearing. If you're using this as an XC race bike the larger 120 BCD is probably fine. But if you're building this up to be an all-up/all-down bike, then go 104/64 BCD.
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