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 Post subject: mavic chainset question
PostPosted: Mon Jan 17, 2011 12:02 pm 
Section Moderator & South West AEC
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Joined: Mon Jun 25, 2007 3:33 pm
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Location: new forest
just bought/won a mavic starfish chainset on evilbay, never had one before, always wanted one as i think they are one of the most beautiful chainsets ever made. :D

http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... 500wt_1054


haven't decided what to do with it yet, whether it will replace something on a current build or be the first part of a new bike :oops: :lol: but either way info would be good.

what's the correct year(s) for this model, i thought early 90's?

the main thing i will need to know is what b/b axle length works with these chainsets and does it have to be mavic? i know campag and shimano didn't mix to well because the tapers are slightly different but i have no clue about mavic either way.



:D


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 Post subject:
PostPosted: Mon Jan 17, 2011 12:42 pm 
Dirt Disciple
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Location: Looking for some bits
I've got one and use a standard Shimano UN51 BB in 113mm. To get the chainline spot-on I put a 3mm spacer on the drive-side cup.

Works fine and yes, looks great :)


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 Post subject:
PostPosted: Mon Jan 17, 2011 1:13 pm 
Old School Grand Master
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That model came in in 1989, and was superseded in about 1994 by the similar 631/2. There's a date code (year and month) on the back of each arm.

Spindle lengths are in the catalogue here:

http://www.cadre.org/bike_stuff/Mavic/Manuals/89-90/

Tapers are ISO (Campag).


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 Post subject:
PostPosted: Tue Jan 18, 2011 7:23 pm 
Section Moderator & South West AEC
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thanks for the replies, hadn't noticed that anyone had! :oops:

the code on the back is 930624 so how does this code break down?

here's a pic of the chainset, think these are loverly!! :D


Attachments:
mavic starfish.jpg
mavic starfish.jpg [ 146.49 KiB | Viewed 2572 times ]
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 Post subject:
PostPosted: Tue Jan 18, 2011 8:02 pm 
Old School Grand Master
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jonnyboy666 wrote:
the code on the back is 930624 so how does this code break down?

I think it's safe to assume 9306 is June 1993.

The 24 may simply be the day, but I've also seen codes with letters at the end (e.g. 9306EE) and four-digit codes (e.g. 9306).


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 Post subject:
PostPosted: Tue Jan 18, 2011 8:41 pm 
Section Moderator & South West AEC
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i had assumed the 93 was the year, trust the french to do it all different though :lol:


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 Post subject:
PostPosted: Tue Jan 18, 2011 10:45 pm 
Retro Guru

Joined: Mon Feb 01, 2010 8:57 pm
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I have one, but one of the chainring studs is seized in the back of the arm and was damaged trying to get it out using a stud extractor - suggest you dismantle and regrease the threads to save yourself future trouble. Lovely chainsets, but fairly hefty by modern standards.


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 Post subject:
PostPosted: Wed Jan 19, 2011 2:04 pm 
Gold Trader
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one-eyed_jim wrote:
Tapers are ISO (Campag).


Now I'm not saying you're wrong - I think it's most likely you are right going by the symptoms of my own, sat on a Royce JIS BB. I was trying to find that out forever and all I found suggested it was JIS.

Where did you find the info?

And who wants to swap a 111 Royce JIS BB for 113 ISO? Or BSA Campag Athena sealed BB cups for Ital?


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 Post subject:
PostPosted: Wed Jan 19, 2011 2:19 pm 
Old School Grand Master
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dbmtb wrote:
Where did you find the info?

I made some measurements of a MAVIC axle, a Campag axle, and a Shimano JIS axle, and compared the depth of taper engagement on a NOS set of 631 cranks.

I'm away from home, and I don't have the figures with me. Perhaps to be more precise I should have said "ISO - or as near as makes no difference."

If you read the thread here (I'm the OP):

http://groups.google.com/group/rec.bicy ... 386dbcf68/

you'll find links to images of a JIS axle, a Campag axle, and a MAVIC axle with a caliper set on the first for comparison:

JIS
http://www.businesscycles.com/graphics/taper.jpg

Campag
http://www.businesscycles.com/graphics/taper2.jpg

MAVIC
http://www.businesscycles.com/graphics/taper3.jpg

Many people seem to find they work well enough on a JIS taper though.


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 Post subject:
PostPosted: Wed Jan 19, 2011 2:35 pm 
Old School Grand Master
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There's a little dimensional information here:

http://groups.google.com/group/rec.bicy ... 46c2?hl=fr


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