a rule of thumb.
3 rings on the front long cage.
2 rings on the front medium cgae
1 ring on the front short gage.
But always check what "RANGE" the mech has.
If the bike is a full suspension frame make sure that the mech can compensate for any "chain grow" through the complete suspension movement.
Sram list the following ranges for their mechs.
Long 45 T Medium 37 T and short 30 T
Max cassette cog 34T, Min 11T
and max Front difference 22T
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