Bottom Bracket Compatibility

ks04us · **Joined:** Tue Nov 25, 2003 9:38 pm **Posts:** 25

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

popawheelie · **Posted:** Wed Nov 26, 2003 10:40 pm

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

Superlite · **Posted:** Wed Nov 26, 2003 10:52 pm

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

Florian · **Posted:** Thu Nov 27, 2003 10:18 am

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.

:-) · **Joined:** Thu Nov 06, 2003 9:37 pm **Posts:** 79

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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Bottom Bracket Compatibility

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