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Shimano cassette bodies
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by John "Splines" Allen
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About Shimano cassette body types

When Sheldon Brown wrote his page about Shimano cassettes, Shimano had offered only a few cassette body types. Now there are several more. This page will help you identify them and discover compatibilities with hubs and sprockets.

Compatibility with hubs depends on the type of splined or threaded attachment to the hub, and the clearance for the axle: a large-diameter thru axle requires a larger opening in the cassette body. In the table below, cassette bodies used with 3/16" or 5/32" balls are for hubs with (larger-diameter) thru axles.

Most but not all Shimano cassette bodies are compatible with the same series of sprockets. Exceptions are the Capreo, the Dura Ace 7850 with aluminum body, also the Micro Spline 12-speed freehubs, which achieve a very wide range by the use of a 10-tooth smallest sprocket and an inner sprocket as large as 51 teeth.

Freehub body length depends on the number and thickness of sprockets. Common lengths from base of the splines that hold the sprockets to the outer end of the freehub body are

The image below shows how this is measurement is taken. The cassette space of both of these 7-speed Freehub bodies is 31mm long. The body on the left has external threads for a threaded Uniglide outer sprocket. The body on the right is a Hyperglide C body which can take an 11T outer sprocket. The measurement is to the outer end of the Freehub body, not to the outer end of the splines.

Freehub body with Unigilde threads

Hyperglide C cassette

Some nonstandard options:

A 7-speed cassette may be installed on an 8-9-10-speed body by adding a 4mm spacer.

There are so many different models of Shimano Freehubs -- well over 100 -- that we can list only representative cassette bodies of each type. Many newer cassette bodies are for hubs with thru axles. When a thru axle is thicker, the bearing balls most be smaller to fit inside the Freehub body.

To search Shimano's site for Freehub bodies with thru axles, run this search. Results run to two pages. Then select EV only for parts lists, and model as the sort key. This will place the Freehubs together and you may click on the links to bring up parts lists. Each parts list gives compatibilities with one or two other hubs, but there are additional compatibilities when, for example, changing to a cassette with a different number of speeds. You may run a similar search on a different characteristic, or the name of a product line.

Shimano 7-8-9-10 speed cassettes fit many other brands of hubs, but the cassette body attachment to the hub is different. For some, the body is not removable.

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Some Shimano cassette body types

Used in...Part no. Identify by Sprocket spline length Series
Micro-spline, used with 10T smallest sprocket M9100 Micro-spline MTB 11-speed and 12-speed with 10T smallest sprocket   Small splines for sprockets and angled splines to attach to hub ? M9100
11-speed cassette body 11-speed road  15 internal splines. 8-9-10 speed cassettes may be used with 1.8mm spacer. Possibly compatible with Dura-Ace 7850 10-speed hub body. 36.75mm  
TX-800, FH-RM33 cassette body FH-TX-800
FH-RM33
FH-M3050
FH-RM35
8-9-10-speed
Y30V98050 12 external splines to attach to hub. Cassette body removes with 10mm Allen key. 35mm  
TX505 freehub body FH-TX-505
FH-MT200
8-9-10-speed disc-brake hub
There is a similar hub for 11-speeds.
Y31S98020 Large threads, protruding inner flange, 9 1/4" bearing balls. Cassette body removes with 12mm Allen key. 35mm  
Shimano M640 cassette body FH-M640
FH-M645
FH-M648
8-9-10-speed
Y3TS98060
Large threads, 13 3/16" bearing balls 35mm Zee
M678 freehub body FH-M678
FH-M788
FH-M828
8-9-10-speed
disc-brake hub
Y3TL98050 Large threads, 13 3/16" bearing balls 35mm SLX
FH-M825 Freehub body
FH-M810
FH-M815
FH-M820
FH-M825
8-9-10-speed
Y3TH98050 Large threads, 13 3/16" bearing balls 35mm Saint
Shimano 7850 freehub body Dura Ace 7850
8-9-10 speed
  Body is of titanium. 15 internal splines to attach to hub shell. See Dura-Ace page. Possibly compatible with 11-speed road hub. 35mm  
Dura Ace 7800 Freehub body Dura-Ace 7800
10-speed
  Aluminum cassette body, tall splines for cassette, ratchet is inside the hub shell. See Dura-Ace page. 36.85mm
special
 
Too many others to list. Many variants   From here on down in the list, 8-9-10-speed bodies have the common 10-spline attachment, with a hollow bolt which installs and removes with a 10mm Allen key. A few variants are shown. Dustcaps differ. See the Shimano Freehub search page for information. Freehubs of this same type may be identified as "road", "MTB", etc. 35mm  
freehub-body-m675 FH-M665
FH-M629
FH-M675
8-9-10-speed, disc-brake hub
Y3D398080 Common 10-spline attachment to hub shell, 9 1/4" balls, 34mm spline length. See Sheldon's cassette page for variants. 35mm SLX
Cassette body Y32X 98040 FH-5501 Y-32X 98040 This cassette body has an included dustcap made for use with sealed bearings. Note also wider flange at left end of splines than with earlier model. See Sheldon's cassette page for variants. 35mm 105
Y3E198030 cassette body FH-2200
FH-2400
FH-3500
FH-RM35
FH-RM66
Y3E098060
Y3E198040
8-9-10-speed Freehub body. No Uniglide threads. Body is held in place by a hollow bolt which installs and removes with a 10mm Allen key. Outer end of splines is relieved for 11T sprocket. Common 10-spline attachment to hub shell, 9 1/4" balls, 35mm spline length. See Sheldon's cassette page for variants. 35mm Claris, Sora
Cassette body 3AP 9801 FH-M737 32P-9801 8-9-10-speed Freehub body. No Uniglide threads. Body is held in place by a hollow bolt which installs and removes with a 10mm Allen key. Outer end of splines is relieved for 11T sprocket. Body is made for use with a rubber seal ring. Common 10-spline attachment to hub shell, 9 1/4" balls, 35mm spline length. See Sheldon's cassette page for variants. 35mm Deore XT
Cassette body 31D 9801 FH 1056-8 31D 9801 8-speed Hyperglide/Uniglide body. Body is held in place by a hollow bolt which installs and removes with a 10mm Allen key. Outer end of splines not relieved for 11T sprocket. 35mm 105SC
Cassette body 32J 9801 FH-M900 32J 9801 8-speed Hyperglide/Uniglide body. Body is held in place by a hollow bolt which installs and removes with a 10mm Allen key. Outer end of splines not relieved for 11T sprocket. 35mm XTR
Cassette body 3AP-9802 FH-A410
FH-M290
FH-M330
FH-M563
FH-C070
3AP-9802
3AP-9804
"Compact" 7-speed body. No Uniglide threads. Body is held in place by a hollow bolt which installs and removes with a 10mm Allen key. Body includes dustcap made for use with seal. ring. Outer end of splines is relieved for 11T sprocket. Common 10-spline attachment to hub shell, 9 1/4" balls, 31mm spline length. See Sheldon's cassette page for variants. 31mm RSX
Acera
Acera-X
Deore LX
700CX
Cassette body 3AP 9801 FH-M290

3AP-9801
32N 9801
"Compact" 7-speed body. No Uniglide threads. Body is held in place by a hollow bolt which installs and removes with a 10mm Allen key. Body includes dustcap not made for use with seal. ring. Outer end of splines is relieved for 11T sprocket. Common 10-spline attachment to hub shell, 9 1/4" balls, 31mm spline length. See Sheldon's cassette page for variants. 31mm Acera-X
700CX
Cassette body HH-HG20 FH-HG20 30H-9801

Uniglide/Hyperglide body: One narrow spline. 6-speed Uniglide with 5.5mm sprocket spacing or 7-speed Hyperglide with 5.0 mm sprocket spacing; body has threads on inside for lockring and on outside for threaded sprocket. Body is held in place by a hollow bolt which installs and removes with a 10mm Allen key. Outer end of splines not relieved for 11T sprocket.

31mm  
Uniglide cassette body FH-1050-6
FH-6208-5
FH-6208-6
FH-A450-6
FH-M730-6
369-9802
359-9821
359-9822
379-9040
Uniglide body held in place by a hollow bolt that installs and removes with a 10mm Allen key. 9 equal splines -- will not work with Hyperglide sprockets unless a lug is ground down. 5 and 6-speed with 5.5mm sprocket spacing; has threads on outside for threaded sprocket. Dustcaps may differ. 24mm,
29.5mm
 
Early Uniglide FH-N510
FH-N610

FH-Q510
FH-Q610
3-353-9004
(5-spd)

3-353-9005 (6-spd)
Early Uniglide body used with hub shell that has a protruding "snout." 9 equal splines -- will not work with Hyperglide sprockets. Held in place only by the bearing cones. See section of cassette page about these. External threads for threaded sprocket and no internal threads for lockring. This body was available in two lengths, 29mm for 5-speed, 31mm for 6-speed, each with standard 5.5 mm sprocket spacing. 24mm,
29.5mm
 

Links>

Joe Tierney, compatibility of SRAM and Shimano 11-speeds

Slowtwitch, table of cassette/body compatibility

Spoke Divider

Spoke Divider

Articles by Sheldon Brown and Others


Reports of the demise of this Web site are greatly exaggerated! We at sheldonbrown.com thank Harris Cyclery for its support over the years. Harris Cyclery has closed, but we keep going. Keep visiting the site for new and updated articles, and news about possible new affilations.

Copyright © 2022 John Allen

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Last Updated: by John Allen