ISO or JIS?

cpeachey
cpeachey Posts: 1,057
edited January 2013 in Workshop
TA Zephre cranks...are they ISO or JIS taper? Also does anyone know the correct axle length for a triple?
Chris

Comments

  • careful
    careful Posts: 720
    ISO. I use 118 but 115 also works
  • careful
    careful Posts: 720
    Oops! Should have checked first! Not sure but it could be JIS. The fitting instructions dont specify. I used a Shimano UN 54, but that doesnt specify which taper either.
  • cpeachey
    cpeachey Posts: 1,057
    Shimano is definately JIS but CURRENT TA seems to be ISO but I am not sure if older TA is also ISO.
    Chris
  • cpeachey
    cpeachey Posts: 1,057
    I found this on the CTC site...
    http://forum.ctc.org.uk/viewtopic.php?f=5&t=11976
    It seems Chicken (UK Importers of Alize & Zephre) say JIS but TA say ISO!!!!
    The consensus seems to be JIS since Chicken sold lots of these and if JIS was wrong one would have expected them to know.
    I will try a couple of UN54 BB's to see which gives best result.
    Chris
  • careful
    careful Posts: 720
    Me again! The mystery is explained on this site:
    http://www.peterwhitecycles.com/carmina.asp

    Its not just me, it really is complicated. If you read through this it explains that TA switched b/b taper types a few years back. The Zephyr c/set was replaced with the Carmina, and newer ones of these have ISO, older ones have JIS. I guess that means that your Zephyr will almost certainly have JIS. As to axle length, that also depends on down tube size. If I were you I would e-mail or call Peter White Cycles - they seem to be specialists. Hope I havent messed you about, as Peter White says, "TA drive me to drink".
  • Monty Dog
    Monty Dog Posts: 20,614
    FWIW there's no difference in taper angle between ISO or JIS - just that JIS is a little wider at the end:

    http://sheldonbrown.com/bbtaper.html

    AFAIK TA have always been ISO
    Make mine an Italian, with Campagnolo on the side..

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