According to Sheldon they have a slightly different spec: ISO 1.375' x 24 tpi English 1.370' x 24 tpi Although strangely enough he lists them as the exact same here: Anyway I have always heard that you can change them up, but don't keep switching back and forth. ISO and English are IDENTICAL and, in fact ISO accepted English threading as it's standard. The numbers you quote are the same thing, just expressed a bit differently.
Italian threading is almost identical and English and Italian components will interchange. There is a minor difference in the apex angle of the threads with English threads having a 60° included angle and Italian threads a 55° angle. You can substitute one for another but it is not recommended you go back and forth.
Dragon city generator no survey. The games are interesting and captivating, thereby engrossing you.
Powerful and versatile Pipe Threading Machines can thread up to 4 inch pipe. How many freewheel thread sizes are there? Have been ISO. Some hubs use 'British' threading. French diameter is smaller, an Italian, ISO or British. Bottom bracket replacement parts. We stock shimano, SKF, Phil Wood bottom brackets. Also Velo-Orange French bottom brackets. We ship worldwide.
If you thread an English freewheel onto an Italian threaded hub, use English threaded freewheels thereafter. French threading is different in both diameter and thread pitch from both English/ISO and Italian and won't interchange with either. ISO and English are IDENTICAL and, in fact ISO accepted English threading as it's standard. The numbers you quote are the same thing, just expressed a bit differently.
Italian threading is almost identical and English and Italian components will interchange. There is a minor difference in the apex angle of the threads with English threads having a 60° included angle and Italian threads a 55° angle.
![French French](https://sc01.alicdn.com/kf/HTB1ChJHKpXXXXXlXFXXq6xXFXXX3/Taiwan-Accessories-for-Car-Auto-Parts-Wheel.jpg)
You can substitute one for another but it is not recommended you go back and forth. If you thread an English freewheel onto an Italian threaded hub, use English threaded freewheels thereafter. French threading is different in both diameter and thread pitch from both English/ISO and Italian and won't interchange with either.
Ah, that makes sense. This page threw me a bit: It lists British and ISO as very slightly different thread sizes. But the question was about Italian threading so I was way off anyway.
![French French](http://sheldonbrown.com/harris/images/compassloupblackkkkk.jpg)
Older multi-speed bicycles have simple rear with a set of threads on the right side of the hub shell. A traditional freewheel cluster has matching threads which screw onto the hub. This is different from the more modern ' or 'cassette hub' design, in which the freewheeling mechanism is a more-or-less integral part of the hub. See also my A standard freewheel attaches to a hub by screwing on to external threads that are part of the hub.
Pedaling tightens the freewheel down on the threads, so no tools are required to install a freewheel. Freewheel Threading. All recent freewheels and threaded hubs, regardless of where made, use ISO threading. Force brute hacker. The older British and Italian standards use the same thread pitch but a very slightly different thread diameter, and are generally interchangeable.
However, for strong riders and on tandems, it is best not to mix and match -- freewheels sometimes do strip the threads of aluminium hubs. A French freewheel may start to thread onto an ISO/British/Italian hub but will soon bind. An ISO/British/Italian freewheel will skim the top of the threads of a French hub and will slip forward if an attempt is made to use it. Do not force a freewheel -- you will ruin the hub. A bottom-bracket cup can serve as a thread gauge for a freewheel: Dimensions are usually marked on cups. Hold the threads of the bottom-bracket cup against those of the hub, and look in between, against the light. If the threads engage tightly all the way across, the thread pitch is the same.
If they rock across each other, it is different. You may check the thread pitch of a freewheel by threading an ISO left bottom-bracket cup into it (not a right cup, which is left-threaded). The cup will go in easily if the thread pitch is the same -- but do have a freewheel extractor tool handy so you can unscrew the cup. Freewheels screw onto the hub without any tools, then, as you ride the bike, your pedaling effort tightens them down. A freewheel that has been ridden for a long time, especially by a strong rider with low gears, may be quite difficult to remove because the threads are so tight. Freewheel bodies have a larger diameter than the spoking flange of many hubs. Warning: loosen a freewheel before cutting the spokes to replace the rim, otherwise you may not be able to loosen the freewheel or to replace the spokes on the right side of the wheel.