Brampton track crank arms with Aluvac 46t chain ring sprocket

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dave429

Wore out three sets of tires already!
Oct 24, 2012
532
Wisconsin
Looking for info on this crankset. What years or era, rare or desirable? Any other info? Thanks!

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Roger Henning

Finally riding a big boys bike
Dec 2, 2018
280
71
Sharon Wisconsin
See my response in your other post. They are not special and were used on English and other 3 speed bikes. Roger
 
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juvela

I live for the CABE
Aug 2, 2014
1,379
Playa del Rey, United States
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what is the length?

for Brampton of this era one would expect 6 1/2"

what is the wedgebolt size?

for Brampton one would expect 3/8" / 9.5mm

a 9.0mm wedgebolt would suggest a continental origin

what is the chainwheel bolt thread?

are chainwheel teeth cut for 1/8" or for 3/32" chain?

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ALUVAC -

this is a frankish producer of cycle fittings which was active in the 1930's and 1940's. do not have start/stop dates for them.

in addition to chainwheels, pedals, tools, and number plates were offered. found one report that they did a derailleur in cooperation with Freres Huret; it was product nr. 3716.

ALUVAC alloy pedals on a REXA machine of the 1930's -

1121308


Number plate -

1121311


1121314


Tool -

1121316


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dave429

Wore out three sets of tires already!
Oct 24, 2012
532
Wisconsin
I have seen the Aluvac chainring used on track racer bikes. Is this something that would commonly be used.
 

bulldog1935

Cruisin' on my Bluebird
Jan 21, 2013
3,853
Bulverde, TX
46T is exactly the chainset used on lightweights with internal geared (Sturmey Archer, etc.) rear hubs, just as @juvela showed.
A track chainset is probably going to be 54-58T
 
Last edited:
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juvela

I live for the CABE
Aug 2, 2014
1,379
Playa del Rey, United States
-----

Here is another chainset wearing a five-pin ALUVAC chainwheel.

1122679




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fat tire trader

Cruisin' on my Bluebird
Oct 29, 2010
3,501
San Quentin, California
www.fattiretrading.com
46T is exactly the chainset used on lightweights with internal geared (Sturmey Archer, etc.) rear hubs, just as @juvela showed.
A track chainset is probably going to be 54-58T
Wow, I rode on the Encino velodrome for a few years and never used a front chainring that big. Most modern and vintage track bikes that I have and have seen have front chainrings smaller than 54T.
 
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dave429

Wore out three sets of tires already!
Oct 24, 2012
532
Wisconsin
-----

what is the length?

for Brampton of this era one would expect 6 1/2"

what is the wedgebolt size?

for Brampton one would expect 3/8" / 9.5mm

a 9.0mm wedgebolt would suggest a continental origin

what is the chainwheel bolt thread?

are chainwheel teeth cut for 1/8" or for 3/32" chain?

---

ALUVAC -

this is a frankish producer of cycle fittings which was active in the 1930's and 1940's. do not have start/stop dates for them.

in addition to chainwheels, pedals, tools, and number plates were offered. found one report that they did a derailleur in cooperation with Freres Huret; it was product nr. 3716.

ALUVAC alloy pedals on a REXA machine of the 1930's -

1121308


Number plate -

1121311


1121314


Tool -

1121316


-----
Crank arms are 7.5” overall and there is a B stamped on the inside.

A247B844-A847-4163-8EB4-B001B00889D9.jpeg


94561719-FB06-4174-856D-9A7A4120923A.jpeg


D448D86C-EF03-4A9E-B29D-610EDEADCE75.jpeg
 
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juvela

I live for the CABE
Aug 2, 2014
1,379
Playa del Rey, United States
----

Thank you. ;)

Trade convention for crank length measurement is center of spindle hole to center of pedal hole.

Appears they are 6 3/4" / ~170mm which is the continental standard for adult machines.

AFAIK the letter B does not necessarily make them Brampton.

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dave429

Wore out three sets of tires already!
Oct 24, 2012
532
Wisconsin
----

Thank you. ;)

Trade convention for crank length measurement is center of spindle hole to center of pedal hole.

Appears they are 6 3/4" / ~170mm which is the continental standard for adult machines.

AFAIK the letter B does not necessarily make them Brampton.

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Any idea what the B could mean? It’s on both arms.
 

juvela

I live for the CABE
Aug 2, 2014
1,379
Playa del Rey, United States
-----

Have seen Bianchi cycles fitted with cottered steel chainsets where the inner face of the arms is marked with a letter B.

For these , the possible makers would have been Magistroni, Way-Assauto and Fratelli Brivio.

IIRC I have such an arm in my parts boxes. Will see if I can locate it in the coming week and check to see if the font employed matches that of your set.

"Usually" with the Bianchi ones the name is marked on the outer face.

Do not wish to suggest that B could not stand for Brampton.

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Thus far readers have not been informed as to:

a) correct length measurement

b) pedal thread

c) intended spindle diameter

d) wedgebolt size

e) dentition: is it cut for 1/8" chain or for 3/32"

f) thread of chainwheel bolts

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Last edited:
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juvela

I live for the CABE
Aug 2, 2014
1,379
Playa del Rey, United States
-----

Regarding the ALUVAC term -

it looks like that at one time it could be both a brand name and a synonym for dural and duralumin...much like CEGEDUR was.

in this post at disraeligears the host writes about its use on a Huret rear mech of the 1940's:


there is a current ALUVAC entity in operation in France. their business seems to be concerned with the control of humidity in indoor environments.


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