Bottom Bracket Compatibility

Discuss light weight issues concerning road bikes & parts.
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ks04us
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Joined: Tue Nov 25, 2003 9:38 pm

by ks04us

Does any one know the difference between JIS taper and ISO? Thanks

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popawheelie
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Location: in Colorado

by popawheelie

I think the J one stands for Japanese and the other stands for Italian.

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Superlite
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by Superlite

Really, thats what that means? Who would have thought! But whats the I, S and O stand for huh? :wink:

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Florian
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by Florian

ks04us wrote:Does any one know the difference between JIS taper and ISO? Thanks

Different tapers:
JIS has a "tip size" of 12.65 mm and a 2° gradient angle
ISO is a little smaller and has a 1.8° angle

JIS means Japanese Industry Standard and ISO means International Organization for Standardization :wink:

Nowadays the ISO standard is only used by Campagnolo, most other use JIS square tapers.

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by :-)

Florian wrote:
ks04us wrote:Does any one know the difference between JIS taper and ISO? Thanks

Different tapers:
JIS has a "tip size" of 12.65 mm and a 2° gradient angle
ISO is a little smaller and has a 1.8° angle

JIS means Japanese Industry Standard and ISO means International Organization for Standardization :wink:

Nowadays the ISO standard is only used by Campagnolo, most other use JIS square tapers.


i looked in to this a while back as im not oversure the info i found agrees with you... i seem to remember the info i found claimed european & japanese tapers were the same angle 2 degrees but the taper tips were different.... european 12.1 mm japanese 12.3 mm.....

i think stronglight & TA also use the european taper

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