55-Series Sprockets
55 series engineer class sprocket are used for a wide verity of chain sizes. These sizes include CA550, CA550HD, CA555, CA557, CA565, 55, C55, SS55, C55A Rooftop, C55B Rooftop, C55D Rooftop, and C55L. These sprockets are typically supplied as cast material but we can also supply them as steel for longer operation. The below chart shows the standard tooth counts as well as dimensions for each size. To get a quote on the sprocket or chain please contact us or fill out the below request form and we will be happy to assist you.
55-Series Sprockets
Sprocket Size |
Tooth Count |
Style |
Pitch Diameter |
Hub Diameter |
Length Thru Bore |
Maximum Bore |
Weight |
55C5 |
5 |
C |
2.77" |
2.00" |
2.00" |
0.94" |
2.0 LBS |
55C6 |
6 |
C |
3.26" |
2.00" |
2.00" |
0.94" |
2.0 LBS |
55B7 |
7 |
B |
3.76" |
2.50" |
2.00" |
1.63" |
3.0 LBS |
55B8 |
8 |
B |
4.26" |
2.50" |
2.00" |
1.63" |
4.0 LBS |
55C9 |
9 |
C |
4.76" |
3.00" |
2.00" |
1.94" |
5.0 LBS |
55C10 |
10 |
C |
5.26" |
3.50" |
2.00" |
2.19" |
5.0 LBS |
55C11 |
11 |
C |
5.77" |
4.50" |
3.00" |
2.88" |
6.0 LBS |
55C12 |
12 |
C |
6.30" |
4.50" |
3.00" |
2.88" |
10.0 LBS |
55C13 |
13 |
C |
6.80" |
4.50" |
3.00" |
2.88" |
10.0 LBS |
55C14 |
14 |
C |
7.31" |
4.50" |
3.00" |
2.88" |
12.0 LBS |
55C15 |
15 |
C |
7.83" |
4.50" |
3.00" |
2.88" |
13.0 LBS |
55C16 |
16 |
C |
8.34" |
4.50" |
3.00" |
2.88" |
13.0 LBS |
55C17 |
17 |
C |
8.85" |
4.50" |
3.00" |
2.88" |
17.0 LBS |
55C18 |
18 |
C |
9.39" |
4.50" |
3.00" |
2.88" |
20.0 LBS |
55C19 |
19 |
C |
9.92" |
4.50" |
3.00" |
2.88" |
20.0 LBS |
55C20 |
20 |
C |
10.43" |
6.00" |
3.50" |
2.88" |
20.0 LBS |
55C21 |
21 |
C |
10.94" |
6.00" |
3.50" |
4.00" |
23.0 LBS |
55C22 |
22 |
C |
11.43" |
6.00" |
3.50" |
4.00" |
24.0 LBS |
55C23 |
23 |
C |
11.97" |
6.00" |
3.50" |
4.00" |
29.0 LBS |
55C24 |
24 |
C |
12.47" |
6.00" |
3.50" |
4.00" |
32.0 LBS |
55C25 |
25 |
C |
13.00" |
8.00" |
4.00" |
6.00" |
31.0 LBS |
55C27 |
27 |
C |
14.07" |
8.00" |
4.00" |
6.00" |
38.0 LBS |
55C28 |
28 |
C |
14.54" |
8.00" |
4.00" |
6.00" |
42.0 LBS |
55C29 |
29 |
C |
15.08" |
8.00" |
4.00" |
6.00" |
26.0 LBS |
55C30 |
30 |
C |
15.59" |
8.00" |
4.00" |
6.00" |
54.0 LBS |
55C31 |
31 |
C |
16.11" |
8.00" |
4.00" |
6.00" |
58.0 LBS |
55C32 |
32 |
C |
16.63" |
8.00" |
4.00" |
6.00" |
63.0 LBS |
55C34 |
34 |
C |
17.67" |
8.00" |
4.00" |
6.00" |
31.0 LBS |
55C35 |
35 |
C |
18.20" |
8.00" |
4.00" |
6.00" |
69.0 LBS |
55C36 |
36 |
C |
18.70" |
8.00" |
4.00" |
6.00" |
77.0 LBS |
55C38 |
38 |
C |
19.75" |
8.00" |
4.00" |
6.00" |
35.0 LBS |
55C40 |
40 |
C |
20.79" |
10.00" |
4.00" |
8.00" |
37.0 LBS |
55C41 |
41 |
C |
21.31" |
10.00" |
4.00" |
8.00" |
36.0 LBS |
55C48 |
48 |
C |
24.94" |
10.00" |
4.00" |
8.00" |
45.0 LBS |
55C50 |
50 |
C |
25.98" |
10.00" |
4.00" |
8.00" |
47.0 LBS |
55C54 |
54 |
C |
28.00" |
10.00" |
4.00" |
8.00" |
50.0 LBS |
Weld On Hub 55-Series Sprockets
Sprocket Size |
Tooth Count |
Bore |
Root Diameter |
Outside Diameter |
Hub Type Needed |
Width (B) |
Weight |
55W6 |
6 |
1-5/8" |
2.62" |
3-3/4" |
W |
9/16" |
0.88 LBS |
55X7 |
7 |
2" |
3.11" |
4-1/4" |
X |
9/16" |
1.00 LBS |
55X8 |
8 |
2" |
3.61" |
4-3/4" |
X |
9/16" |
1.44 LBS |
55X9 |
9 |
2" |
4.12" |
5-1/4" |
X |
9/16" |
2.06 LBS |
55X10 |
10 |
2" |
4.63" |
5-3/4" |
X |
9/16" |
2.50 LBS |
55X11 |
11 |
2" |
5.14" |
6-1/4" |
X |
9/16" |
3.32 LBS |
55X12 |
12 |
2" |
5.65" |
6-3/4" |
X |
9/16" |
4.00 LBS |
55X13 |
13 |
2" |
6.16" |
7-1/4" |
X |
9/16" |
5.00 LBS |
55X14 |
14 |
2" |
6.67" |
7-3/4" |
X |
9/16" |
5.92 LBS |
55X15 |
15 |
2" |
7.19" |
8-1/4" |
X |
9/16" |
6.77 LBS |
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Requesting 55-Series Sprockets
To get a quote on 55-Series Sprocket simply fill out the request for quote from and someone from our customer service team will contact you. Please note that if you don't see the sprocket size you need above send us an email or give us a call.
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