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Old September 13th 17, 04:31 PM posted to rec.bicycles.tech
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Default program to compute gears, with table

On Tuesday, September 12, 2017 at 5:13:45 PM UTC-7, Emanuel Berg wrote:
Here is what Wikipedia says: [1]

With derailleur equipped bicycles, the
external width of the chain also matters,
because chains must not be too wide for the
cogset or they will rub on the next larger
sprocket, or too narrow that they might
fall between two sprockets.

Chains can also be identified by the number
of rear sprockets they can support,
anywhere from 3 to 11, and the list below
enables measuring a chain of unknown origin
to determine its suitability.

* 6 speed – 7.8 mm (5/16")
* 7 speed – 7.3 mm (9/32")
* 8 speed – 7.1 mm (9/32")
* 9 speed – 6.6 to 6.8 mm (1/4 to 9/32")
* 10 speed – 6.2 mm (1/4") (Shimano, Campagnolo)
* 10 speed (Narrow) – 5.88 mm (7/32") (Campagnolo, KMC)
* 10 speed (Narrow, Direction) – 5.88 mm (7/32") (Shimano CN-5700, CN-6700, CN-7900)
* 11 speed – 5.5 mm (7/32") (Campagnolo, KMC, Shimano CN-9000)

Interesting that the 7 and 8 are the same in
inches, but not in mm.

$ units -t '7.3 mm' '1|32 in'
9.1968504

$ units -t '7.1 mm' '1|32 in'
8.9448819

[1] https://en.wikipedia.org/w/index.php...&printable=yes


Presenting actual facts is not allowed on this group. You're supposed to be someone that last rode a bike in 1972 and have a vague recollection of what their bike repair guy told them they think.
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