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Bottom bracket upgrade(2 posts)

Bottom bracket upgradedan ida
Sep 27, 2002 5:18 PM
I have a really comfortable old bike with cup style bottom braket (trek420). I want to change to modern sealed bottom bracket. If it threads in and is the same width, will it work? Are the older tapers the same as the newer ones? I haven't yet taken it apart yet but I will caliper the tapers at that point. Anyone done this?
re: Bottom bracket upgradeRusty Coggs
Sep 27, 2002 6:37 PM
It's done all the time.It's english thread.Shimano and most other oriental cranks(some suntour excepted) used JIS taper(shimano cartridge).ISO taper is found on campy and other european cranks.Measure spindle length end of taper to end of taper.