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MTB chainrings- (in order by BCD)

BCD	Speed	Teeth	Brand	Notes	Price
64	9spd	22T	Blackspire	SuperPro , alloy,ramped and pinned 4-bolt	$11.99	Quantity:	View Cart
104	9spd	34T	Blackspire	SuperPro , alloy,ramped and pinned 4-bolt	$28.99	Quantity:	View Cart
104	9spd	44T	FSA	Pro ATB, alloy, ramped, pinned	$29.95	Quantity:	View Cart
110	9spd	34T	Blackspire	SuperPro , alloy,ramped and pinned	$30.99	Quantity:	View Cart
110	9spd	36T	Blackspire	SuperPro , alloy,ramped and pinned	$29.99	Quantity:	View Cart
110	8spd	42T	Blackspire	Epic , alloy, non-ramped	$18.00	Quantity:	View Cart
110	9spd	46T	FSA	Pro ATB, alloy, ramped, pinned	$31.00	Quantity:	View Cart
110	9spd	48T	FSA	Pro ATB, alloy, ramped, pinned	$31.00	Quantity:	View Cart

Bolt Circle Diameter (BCD): This is the measurment of the distance between oposing bolt holes. The measurement is made from the center of one hole to the center of the hole across from it (i.e. not the one next to it). Fortunately most chainrings have their BCD measurment stamped on them, so it is rare that you will actually have to measure one. Just replace the ring with one with the same BCD. On a crank with three chainrings (a.k.a. a triple) the smallest chainring will have a lower BCD than the others. Here are some common combinations:
MTB 4-bolt: 104/64
MTB compact: 94/58
MTB Standard: 110/74
Road Standard: 130/74
These are for referance only, always check your actual ring or crank to determine the BCD you need.