"Walt Shekrota" <[email hidden]> wrote in message
news:[email hidden]...
Quoted message said:Jean Pasquet said:Bonjour,
[email hidden] a écrit :
Quoted message said:> What is the difference in these? Is it thread direction? Choices are
> eng/french/swiss?
Quoted message said:http://draco.acs.uci.edu/rbfaq/FAQ/8f.8.html
Motobecane french bike was with :
- 1.370" x 24 F tpi (BSC)
- but, the right cup was with a screw thread to the left and no right
nonetheless !
Ok in that doc it says
"The type of thread is usually marked on the face of both left
and right cups."
Mine say the same 35xP1 on either ring. So does it follow that the right
or
Quoted message said:drive side also tightens to the right or comes off to the left as a
french?
Quoted message said:I say this because the above implies the threads are the same if marked
the
Quoted message said:same.
Now if I take that a step further I would think a cartridge BB would
only
Quoted message said:work in a french or italian that could thread straight through both
sides
Quoted message said:instead of encountering opposing thread as in english.
Thanks
-Walt
35xP1 is METRIC = 35mm x 1mm PITCH.
SI is French for Système international or ISO - the International
Organization for Standardization.
I have a collection of older Motobecanes form the 70s and early 80s.They
all have metric BB threads, either French or Swiss threads. The difference
being Swiss fixed cups have Left Hand threads and French are Right Hand.
Both my 1974 Grand Jubiles have French BBs. My 1980 Grand Jubile has a
Swiss BB as does my 1982 Grand Record. My 1978 and 1982 Team Champions
both have French BB. Some later Motobecanes came with English BBs.
You can also get a Phil sealed bearing BB which are expensive but will
last for years of trouble free service. One of the early Shimano sealed
bearing BBs with removable cups on both sides will also work with Phil
French cups. You'll need to use a BB with the same length and style of
taper as your original spindle.
Chas.