Ventura 1/2x1/8" and 1/2x3/32" chain
 

Ventura [1] has single speed chains that are
1/2x1/8", but also 1/2x3/32".

If there isn't a marking, can you deduct the
chain size from the width of the chainring
and/or sprocket?

Probably either chain will work, right?

$ echo $(( 1/8.0 ))
0.125
$ echo $(( 3/32.0 ))
0.09375

[1] http://www.ventura-parts.com

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Ventura 1/2x1/8" and 1/2x3/32" chain
 

On Friday, July 6, 2018 at 3:16:27 PM UTC-5, Emanuel Berg wrote:
Ventura [1] has single speed chains that are
1/2x1/8", but also 1/2x3/32".

If there isn't a marking, can you deduct the
chain size from the width of the chainring
and/or sprocket?

Probably either chain will work, right?

$ echo $(( 1/8.0 ))
0.125
$ echo $(( 3/32.0 ))
0.09375

[1] http://www.ventura-parts.com

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1/8 inch 3.2 mm is fixed / freewheel single speed only.
3/32 inch 2.4 mm is derailuer wheel inside width. Some fixed / freewheel also use this size to allow switching.

OUTSIDE width needs to be determined since it varies for each 6 to 11 gears.
https://en.wikipedia.org/wiki/Bicycle_chain#Width

Ventura 1/2x1/8" and 1/2x3/32" chain
 

mike.phone.schwab wrote:

1/8 inch 3.2 mm is fixed / freewheel single
speed only. 3/32 inch 2.4 mm is derailuer
wheel inside width. Some fixed / freewheel
also use this size to allow switching.

Okay, but what do the digits 3.2 mm and
2.4 mm indicate?

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Ventura 1/2x1/8" and 1/2x3/32" chain
 

On Sunday, July 8, 2018 at 9:58:47 AM UTC-5, Emanuel Berg wrote:
mike.phone.schwab wrote:

1/8 inch 3.2 mm is fixed / freewheel single
speed only. 3/32 inch 2.4 mm is derailuer
wheel inside width. Some fixed / freewheel
also use this size to allow switching.

Okay, but what do the digits 3.2 mm and
2.4 mm indicate?

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Those are the metric equivalent of the gap inside the chains. The outside width varies by 6, 7, 8, 9, 10, 10N, 10ND, 11 gears.

Ventura 1/2x1/8" and 1/2x3/32" chain
 

Mike A Schwab wrote:

Those are the metric equivalent of the gap
inside the chains. The outside width varies
by 6, 7, 8, 9, 10, 10N, 10ND, 11 gears.

Aha, here it is:

Chains come in 3/32 in (2.4 mm), 1/8 in
(3.2 mm), 5/32 in (4.0 mm), or 3/16 in
(4.8 mm) roller widths, the internal width
between the inner plates. 1/8 in (3.2 mm)
chains are typically used on bikes with
a single rear sprocket: those with coaster
brakes, hub gears, fixed gears such as
track bicycles, or BMX bikes. Chains with
3/32 in (2.4 mm) wide rollers are generally
used on bikes with derailleurs such as
racing, touring, and mountain bikes.
Fixed sprockets and freewheels are also
available in 3/32 in (2.4 mm) widths so
fixed-gear and single-speed bikes can be
set up to use the narrower and lighter 3/32
in (2.4 mm) chains. [1]

[1] https://en.wikipedia.org/wiki/Bicycle_chain#Width

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Ventura 1/2x1/8" and 1/2x3/32" chain
 

Mike A Schwab wrote:

Those are the metric equivalent of the gap
inside the chains. The outside width varies
by 6, 7, 8, 9, 10, 10N, 10ND, 11 gears.

Ah, seems to check out. The 1/2x1/8" notation
is (plate length) x (roller width) with "roller
width" = "gap inside the chains".

$ units '1|8 in' mm
* 3.175
/ 0.31496063
$ units '3|32 in' mm
* 2.38125
/ 0.41994751

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