Sprocket & Chain Matrix

Find the right sprocket/chain matrix for your Harley-Davidson

For Softail & Dyna models, use the matrix for either 1994/1995 and later primarys with pedestal bosses, or 1993/1994 and earlier primarys without pedestal bosses. Note that some 1994 models might have inner pedestal bosses.

For FL/FR models, use the sprocket/chain matrix for 1987-up.

Sprocket / Chain Matrix for Softail and Dyna Models

1994/1995 and Later Primarys with Pedestal Bosses

Primary Chain Length
CLUTCH SPROCKETS
# OF TEETH 35 36 37 38
COMP SPROCKETS 21 80P
22 80P 82P+FS
23 82P+FS 82P
24 82P+FS 82P
25 82P
27 84P+FS 84P
28 84P+FS 84P
= FFP Compatible
Drive Ratio
CLUTCH SPROCKETS
# OF TEETH 35 36 37 38
COMP SPROCKETS 21 1.71
22 1.59 1.72
23 1.6 1.65
24 1.5 1.54
25 1.44
27 1.37 1.4
28 1.28 1.32

1993/1994 and Earlier Primarys without Pedestal Bosses
(Some '94 models might have inner pedestal bosses)

Primary Chain Length
CLUTCH SPROCKETS
# OF TEETH 35 36 37 38
COMP SPROCKETS 21 80P
22 80P 82P NOTE 82P NOTE 82P+FS
23 82P NOTE 82P NOTE 82P
24 82P NOTE 82P NOTE 82P
25 82P NOTE 82P
27 84P+FS 84P
28 84P NOTE 84P+FS 84P
Drive Ratio
CLUTCH SPROCKETS
# OF TEETH 35 36 37 38
COMP SPROCKETS 21 1.71
22 1.59 1.63 1.68 1.72
23 1.56 1.6 1.65
24 1.45 1.5 1.54
25 1.4 1.44
27 1.37 1.4
28 1.25 1.28 1.32

FS = Fat (Tensioner). Shoe with tensioner hardware. Bikes with old style shoe will need p/n 39990-01 (Tensioner bracket).
Note: For 1994 and earlier you must flip the tensioner shoe upside down and use stock 82P Chain or purchase an 84P Chain.

Sprocket / Chain Matrix '87–up FL/FXR Models

Primary Chain Length
CLUTCH SPROCKETS
# OF TEETH 35 36 37 38
COMP SPROCKETS 21 74P+FS 74P N/A N/A
22 74P N/A 76P+FS 76P FS
23 76P NOTE 76P NOTE 76P+FS 76P
24 76P NOTE 76P FS 76P 78P NOTE
25 76P+FS 76P N/A N/A
27 78P NOTE 78P+FS
28 78P+FS 78P FS 78P N/A
Drive Ratio
CLUTCH SPROCKETS
# OF TEETH 35 36 37 38
COMP SPROCKETS 21 1.66 1.71 N/A N/A
22 1.59 N/A 1.68 1.72
23 1.52 1.56 1.6 1.65
24 1.45 1.5 1.54 1.58
25 1.4 1.44 N/A N/A
27 1.29 1.33
28 1.25 1.28 1.32 N/A

FS = Fat (Tensioner). Shoe with tensioner hardware. Bikes with old style shoe will need p/n 39990-01 (Tensioner bracket).
Note: For old style tentioner only! Must flip the tensioner shoe upside down. If you have the old style anchor plate nut we recommend changing to a carriage bolt which is p/n 5444 from Harley-Davidson. Or you can use a 3/8-16 x 3” carriage bolt, 3/8” nylock nut and a 3/8” washer from your local hardware store.

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