Bottom bracket for Mavic 631(?) cranks?

I've just bought a pair of the last incarnation of Mavic's distinctive
"Starfish" cranks, date stamped 1995: the spider is slightly less
extravagant than the earlier model, and the arms are slightly 'low
profile'.

Can anybody tell me what bottom bracket lengths Mavic recommended for use
as a single, double or triple?

Thanks,

James Thomson

"Defendit numerus." - Anonymous
On Sun, 20 Mar 2005 20:30:02 +0100, "James Thomson"
wrote:

I've just bought a pair of the last incarnation of Mavic's distinctive
"Starfish" cranks, date stamped 1995: the spider is slightly less
extravagant than the earlier model, and the arms are slightly 'low
profile'.

Can anybody tell me what bottom bracket lengths Mavic recommended for use
as a single, double or triple?

The spindle lengths were common to both the 631 and 631/2 crank
models. Seriatim in the order in your question: 110, 114, 119.
-------------------------------
John Dacey
Business Cycles, Miami, Florida
Since 1983
Comprehensive catalogue of track equipment: online since 1996.
http://www.businesscycles.com

James Thomson wrote:
I've just bought a pair of the last incarnation of Mavic's distinctive
"Starfish" cranks, date stamped 1995: the spider is slightly less
extravagant than the earlier model, and the arms are slightly 'low
profile'.

Can anybody tell me what bottom bracket lengths Mavic recommended for use
as a single, double or triple?

Thanks,

James Thomson



Single and double were 114mm, JIS taper, so any shimano one of this
length will work.

In article 1111355373.d4e41b739c67375c3294b37cc8a2d8a0@teran ews,
Qui Si Parla Campagnolo wrote:

James Thomson wrote:
I've just bought a pair of the last incarnation of Mavic's distinctive
"Starfish" cranks, date stamped 1995: the spider is slightly less
extravagant than the earlier model, and the arms are slightly 'low
profile'.

Can anybody tell me what bottom bracket lengths Mavic recommended for use
as a single, double or triple?

Thanks,

James Thomson



Single and double were 114mm, JIS taper, so any shimano one of this
length will work.

would not using the same spindle length on both single and double result
in a bad chainline for one of the applications?

Are you sure the taper is JIS? Were the older Mavic cranks JIS too?

Baird

Baird Webel wrote:
In article 1111355373.d4e41b739c67375c3294b37cc8a2d8a0@teran ews,
Qui Si Parla Campagnolo wrote:


James Thomson wrote:

I've just bought a pair of the last incarnation of Mavic's distinctive
"Starfish" cranks, date stamped 1995: the spider is slightly less
extravagant than the earlier model, and the arms are slightly 'low
profile'.

Can anybody tell me what bottom bracket lengths Mavic recommended for use
as a single, double or triple?

Thanks,

James Thomson



Single and double were 114mm, JIS taper, so any shimano one of this
length will work.


would not using the same spindle length on both single and double result
in a bad chainline for one of the applications?

Are you sure the taper is JIS? Were the older Mavic cranks JIS too?

Baird
They were JIS, we used un-72s all the time when somebody didn't want to
face the BB shell at 45 degrees for the Mavic BB.

I assumed as a 'single' you would put the single ring on the inside,
which would need a 114mm for frame clearance. I never saw a Mavic last
gen track crank that looked like the road one.

"John Dacey" wrote:

The spindle lengths were common to both the 631 and
631/2 crank models.

I take it 631/2 is the designation for the later model?

http://www.classicrendezvous.com/Fra..._new_crnks.htm

Seriatim in the order in your question: 110, 114, 119.

Thanks. Do you happen to have data for taper and symmetry?

James Thomson

"Qui Si Parla Campagnolo" wrote:

Single and double were 114mm, JIS taper, so any shimano
one of this length will work.

Thanks Peter.

I've just made a test fit on a UN72, and the taper fit doesn't look the
best. Are you certain it's JIS?

James Thomson

"Baird Webel" wrote:

Were the older Mavic cranks JIS too?

I have a Mavic SSC (Record copy) crank from '88 that uses - as might be
expected - Campag tapers. My 631/2 doesn't look to be a great fit on a
UN72.

James Thomson

"Rerum omnium magister usus." - I. Caesar
On Tue, 22 Mar 2005 17:28:24 +0100, "James Thomson"
wrote:

"John Dacey" wrote:

The spindle lengths were common to both the 631 and
631/2 crank models.

I take it 631/2 is the designation for the later model?

Yes.


http://www.classicrendezvous.com/Fra..._new_crnks.htm

Seriatim in the order in your question: 110, 114, 119.

Thanks. Do you happen to have data for taper and symmetry?

I cannot recall ever having seen the taper type specified in any
official Mavic literature (why don't more manufacturers do this?), but
I believe the claim found elsewhere in this thread that it's JIS is in
error. Of the Mavic cranks I've ever seen installed on Shimano bottom
brackets, the crank did not drawn up on the spindle to the same
engagement depth as when partnered with a Mavic bottom bracket.

I can't locate any written specifics about symmetricality of the
various Mavic spindles. Working from memory (with all the attendant
caveats), I believe the 110 and 112 spindles were symmetrical, whereas
the 114, 116, 119 and 123 spindles all offered various amounts of
right side offsets.

-------------------------------
John Dacey
Business Cycles, Miami, Florida
Since 1983
Comprehensive catalogue of track equipment: online since 1996.
http://www.businesscycles.com

John Dacey wrote:
"Rerum omnium magister usus." - I. Caesar
On Tue, 22 Mar 2005 17:28:24 +0100, "James Thomson"
wrote:


"John Dacey" wrote:


The spindle lengths were common to both the 631 and
631/2 crank models.

I take it 631/2 is the designation for the later model?


Yes.


http://www.classicrendezvous.com/Fra..._new_crnks.htm


Seriatim in the order in your question: 110, 114, 119.

Thanks. Do you happen to have data for taper and symmetry?


I cannot recall ever having seen the taper type specified in any
official Mavic literature (why don't more manufacturers do this?), but
I believe the claim found elsewhere in this thread that it's JIS is in
error. Of the Mavic cranks I've ever seen installed on Shimano bottom
brackets, the crank did not drawn up on the spindle to the same
engagement depth as when partnered with a Mavic bottom bracket.

I can't locate any written specifics about symmetricality of the
various Mavic spindles. Working from memory (with all the attendant
caveats), I believe the 110 and 112 spindles were symmetrical, whereas
the 114, 116, 119 and 123 spindles all offered various amounts of
right side offsets.

-------------------------------
John Dacey
Business Cycles, Miami, Florida
Since 1983
Comprehensive catalogue of track equipment: online since 1996.
http://www.businesscycles.com

Well, my memory tells me that the taper was the same as UN-72, and they
did draw up and produce the samee chainline as the Mavic one.