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Vaginatarian
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Discussion Starter · #1 ·
are the 2x10 and 3x10 chain rings interchangeable?
I may want to go 2x10 with a bash guard but I like the 24 t granny on the 3x10
in other words can I use a 24t granny instead of the 26 or 28 that comes on the 2x10
 

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It depends on which crankset you are talking about. I believe the XTR trail double has a different bolt pattern than the race double. If you are just talking about XT and below, I believe the answer is yes.

If you want 2x10 with a bash guard and a 24T granny, just get the triple and replace the big chainring with a bashguard.

Like this:
 

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so, I could get a 3x10, pull the big ring add bash guard and change the granny from 22 to 26 or 28?
Yes, but a 26/32 or 28/32 is pretty close gearing. You might want a 36 or larger middle ring to provide a good range.

The XTR Trail double is a 26/38 and you can fit a bashguard to it if you want.

The XT double comes in a 26/38 or 28/40. It uses the same bolt pattern as the inner 2 chainrings on the triple, but the spider is different so it may not fit a bash guard. I assume you could put these chainrings on an XT triple crankset and then add a bash guard, but I haven't actually tried this.

SRAM has various 2X chainring options including 22/36, 24/38, 26/39, and 28/42, The 26/39 and 28/42 use an 80/120 BCD. The 22/36 and 24/38 use a 64/104 BCD, essentially the inner 2 chainring positions on the triple spider, and you can fit a bashguard if you want.

For a 29er trail bike, riding slower technical trails, I personally prefer a triple crankset with the big ring replaced with a bashguard. The 32T (Shimano) or 33T (SRAM) middle chainring with an 11-36T cassette allows me to mostly stay in that chainring, like a 1x10 setup, but I have the 24T or 22T granny for the really steep climbs or as a bailout gear if I need it.
 

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Vaginatarian
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5,686 Posts
Discussion Starter · #7 ·
Yes, but a 26/32 or 28/32 is pretty close gearing. You might want a 36 or larger middle ring to provide a good range.

The XTR Trail double is a 26/38 and you can fit a bashguard to it if you want.

The XT double comes in a 26/38 or 28/40. It uses the same bolt pattern as the inner 2 chainrings on the triple, but the spider is different so it may not fit a bash guard. I assume you could put these chainrings on an XT triple crankset and then add a bash guard, but I haven't actually tried this.

SRAM has various 2X chainring options including 22/36, 24/38, 26/39, and 28/42, The 26/39 and 28/42 use an 80/120 BCD. The 22/36 and 24/38 use a 64/104 BCD, essentially the inner 2 chainring positions on the triple spider, and you can fit a bashguard if you want.

For a 29er trail bike, riding slower technical trails, I personally prefer a triple crankset with the big ring replaced with a bashguard. The 32T (Shimano) or 33T (SRAM) middle chainring with an 11-36T cassette allows me to mostly stay in that chainring, like a 1x10 setup, but I have the 24T or 22T granny for the really steep climbs or as a bailout gear if I need it.
thats what I am using now, xcept I have a 21t granny. my problem is my new WFO frame has a bolt on fd and the granny rubs on the cage in all but the 2 lowest (biggest) cogs. I dont really see much to offer for 29ers in the new 2x10 setups as they have too high a gear range
for our type riding but there seems to not be any options for bolt on fd except in the 10 speed type.
 
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