Spacing (Cassette, Freewheel Sprockets)

Sheldon Brown's Bicycle Glossary · letter S· term in the original: Spacing (Cassette/Freewheel Sprockets)
← Spacing (Dropout, Axle) · Spanner →

	Center-to-center Spacing	Sprocket Thickness	Spacer Thickness	Total Width
"Regular" 5-/6-speed	5.3 mm	1.85 mm	3.5 mm
Sun Tour "Ultra" 6-speed	5.0 mm	1.85 mm	3.15 mm
The above dimensions are approximate. Before indexed shifting, spacing was not standardized.
Sun Tour "Accushift" 6-speed	5.5 mm	2.0 mm	3.5 mm	30 mm
Shimano HG 7-speed	5.0 mm	1.85 mm	3.15 mm
Shimano IG 7-speed	5.0 mm	2.35 mm	2.65 mm
SRAM Freewheel 7-speed	5.0 mm	1.8 mm	3.2 mm
Sun Tour 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
Campagnolo 8-speed	5.0 mm	1.9 mm	3.1 mm
Sachs 7-speed & 1997 8-speed	5.0 mm	1.8 mm	3.2 mm
Sachs 1998+ 8-speed	4.8 mm	1.8 mm	3.0 mm
Shimano 8-speed	4.8 mm	1.8 mm	3.0 mm
SRAM Cassette 8-speed	4.8 mm	1.8 mm	3.0 mm
SRAM Freewheel 8-speed	5.0 mm	1.8 mm	3.2 mm
Sun Tour 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
Campagnolo 9-speed	4.55 mm	1.75 mm	2.8 mm
Shimano 9-speed	4.34 mm	1.78 mm	2.56 mm
SRAM 9-speed	4.34 mm	1.8 mm	2.54 mm
Campagnolo 10-speed	4.12 mm	1.7 mm	2.42 mm
Shimano 10-speed	3.95 mm	1.6 mm	2.35 mm

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