What is the difference between JIS, JIS low profile, and ISO tapers?
Phil Wood offers all three tapers to try and best meet the needs of our customers who are using square-tapered bottom brackets. An explaination of the different bottom bracket tapers can be found here. In brief, most modern cranks will take the JIS (Japanese Industrial Standard) taper, in addition to Campagnolo cranks produced before 1994. After 1994, Campagnolo moved to the ISO (a.k.a. Campy) taper. The less common of the three tapers offered is the JIS low profile, which is used in some specific older-model Dura Ace cranks.
