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Sheldon Brown's Bicycle Frame and Cassette Spacing Crib Sheet

Frame/Fork Spacing

70 mm Bike Friday tikit, Birdy, Breezer Itzy, Brompton front hub.
74 mm Dahon Speed front hub.
79 mm Dahon Vitesse front hub (report from reader, unconfirmed).
91 mm Low-end front hubs.
96 mm Older front hubs, especially French.
100 mm Modern front hubs.
110 mm Rear older track, coaster brake and other single-speed hubs. Also, front hubs for Downhill bikes with 20 mm axles.
114 mm Rear 3-4-speed. This is US, U.K. Same as 4 1/2 inches.
120 mm Rear 5-speed, Ultra 6, newer track hubs.
126 mm Rear 6- and 7-speed (road).
130 mm Rear 7-speed (MTB) and 8- 9- and 10-speed (road).
135 mm Rear 7- 8- and 9-speed (MTB)
140 mm Rear tandem.
145 mm Rear tandem (newer models.)
150 mm Retro-Choppers, some Downhill and Freeride models.
160 mm Rear tandem (new Santana proposed standard.)

Overall axle length for quick release hubs is commonly 11 mm longer than the overlocknut distance listed, 5.5 mm on each side. For overlocknut distance of specific makes and models of internal-gear and singlespeed hubs, see the articles on chainline.

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Cassette /Freewheel Spacing

Brand and model Center-to-center
Spacing
Sprocket Thickness Spacer Thickness Total Width
5-speed
"Regular"
5-speed
5.5 mm 2.0 mm 3.5 mm 24.0 mm
G. Caimi/Everest/Simplex
5-speed
5.35 mm 1.85 mm 3.5 mm 23.2 mm
6-speed
"Regular"
6-speed
5.5 mm 2.0 mm 3.5 mm 29.5 mm
G. Caimi/Everest/Simplex
6-speed
5.35 mm 1.85 mm 3.5 mm 28.6 mm
Sun Tour "Ultra"
Freewheel 6-speed
5.0 mm 1.85 mm 3.15 mm 26.9 mm
Sun Tour Accushift
XCD-6 6-speed
5.5 mm 2.0 mm 3.5 mm 29.5 mm
7-speed
Shimano HG
7-speed
5.0 mm 1.85 mm 3.15 mm 31.9 mm
Shimano IG
7-speed
5.0 mm 2.35 mm 2.65 mm 32.4 mm
Sachs
7-speed
5.0 mm 1.8 mm 3.2 mm 31.8 mm
SRAM Freewheel
7-speed
5.0 mm 1.8 mm 3.2 mm 32.8 mm
Sun Tour "Ultra"
Freewheel 7-speed
5.0 mm 1.85 mm 3.15 mm 32.4 mm
Sun Tour
MicroDrive 7-speed
4.8/5.0 mm 2.0 mm 3 x 2.8 mm(L)
3 x 3.0 mm(H)
31.5 mm
8-speed
Campagnolo
8-speed
5.0 mm 1.9 mm 3.1 mm 36.9 mm
Mavic
8-spd w/rounded dogs
5.2 mm 2.0 mm 3.2 mm 37.0 mm
Shimano
8-speed
4.8 mm 1.8 mm 3.0 mm 35.4 mm
Sachs
1997 8-speed
5.0 mm 1.8 mm 3.2 mm 36.8 mm
Sachs 1998+
8-speed
4.8 mm 1.8 mm 3.0 mm 35.4 mm
SRAM Cassette
8-speed
4.8 mm 1.8 mm 3.0 mm 35.4 mm
SRAM Freewheel
8-speed
5.0 mm 1.8 mm 3.2 mm 36.8 mm
Sun Tour
MicroDrive 8-speed
4.8/5.0 mm 2.0 mm 3 x 2.8 mm(L)
4 x 3.0 mm(H)
36.5 mm
9-speed
Campagnolo
9-speed
4.55 mm 1.75 mm 2.8 mm 38.2 mm
Shimano
9-speed
4.34 mm 1.78 mm 2.56 mm 36.5 mm
SRAM
9-speed
4.34 mm 1.8 mm 2.54 mm 36.5 mm
10-speed
Campagnolo
10-speed
Variable (note) 1.7 mm Variable (note) 38.8 mm
Shimano
10-speed
3.95 mm 1.6 mm 2.35 mm 37.2 mm
(note)
11-speed
Campagnolo
11-speed
Variable (note) 1.6 mm Variable (note) 40.1 mm
(note)
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