What is the difference between JIS and ISO square taper?

JIS (Japanese Industrial Standard) taper is slightly shallower (2 degrees less than ISO), causing cranks to seat 4.2mm deeper on the axle. Shimano cranks use JIS. ISO is used by Campagnolo and some European brands. Using the wrong taper standard causes incorrect crank seating and premature loosening.

Does this fit modern Shimano Ultegra or 105 cranksets?

No — modern Shimano road cranksets (105 R7000 and above) use Hollowtech II, which requires an external cup bottom bracket, not a square taper BB. This BB is for older Shimano square taper cranks (Sora, Tiagra, Tourney, pre-2004 105/Ultegra).

How do I prevent my bottom bracket from creaking?

Creaking is almost always caused by insufficient grease on the axle and cup threads, or a loose cup. Remove the BB, thoroughly clean threads, apply fresh waterproof grease, reinstall to correct torque (34–50 Nm). If creaking persists, the bearing itself is worn and the BB needs replacement.

Token

Token JIS Square Taper Bottom Bracket Cromo Axle - 113.5

Name: Token JIS Square Taper Bottom Bracket Cromo Axle - 113.5
Brand: Token
SKU: CMB_LONGSHINE_DBB838HAL-TK02
Price: 2450.00 INR
Availability: InStock
Author: InstaSport Editorial

₹2450.00

Description

The Token JIS Square Taper Bottom Bracket with 113.5mm chromoly (CrMo) axle is a threaded external-shell BB designed for bikes using JIS (Japanese Industrial Standard) square taper cranks — the most common interface on Shimano entry-level to mid-range cranksets (Tourney, Claris, Sora, Tiagra, older