| Threading |
CYCLES PEUGEOT
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Threading
Peugeot bikes prior to approximately 1980 have French threading for both bottom
brackets and forks/headsets. Around 1980 Peugeot began converting over to
British threading or 'B.S.A.' During the conversion period they also used 'Swiss'
not used at the same time. Full conversion to British threading was completed by
1986 and possibly sooner.
Information on dating the transition away from French threading (metric tubes) is
partialy based on an E-mail from the Reynolds Tubing company based in England.
Reynolds has documentation of Peugeot using metric and Imperial tubing in the
U.K during 1978, Imperial only in the U.K. for 1981 and metric only for the French
market in 1980. Its very clear the transition began around 1980. Information is
also based on first hand accounts from Peugeot owners with bikes from a known
year and Peugeot catalogs.
Peugeot bikes prior to approximately 1980 have French threading for both bottom
brackets and forks/headsets. Around 1980 Peugeot began converting over to
British threading or 'B.S.A.' During the conversion period they also used 'Swiss'
not used at the same time. Full conversion to British threading was completed by
1986 and possibly sooner.
Information on dating the transition away from French threading (metric tubes) is
partialy based on an E-mail from the Reynolds Tubing company based in England.
Reynolds has documentation of Peugeot using metric and Imperial tubing in the
U.K during 1978, Imperial only in the U.K. for 1981 and metric only for the French
market in 1980. Its very clear the transition began around 1980. Information is
also based on first hand accounts from Peugeot owners with bikes from a known
year and Peugeot catalogs.
Forks/headsets
French headsets have 25x1 threading which is slightly less than 1 inch (25.4mm) across with a pitch of 1
thread per mm.
British headsets have 1' (25.4mm)x24 t.p.i threading. British headsets are slighly larger in diameter than
French headsets (25.mm) with a pitch of 24 threads per inch or 1.058mm versus the French pitch of 1mm.
The easiest way to determine if your Peugeot has French or British threading is to remove the stem and
check for a stamping, 22.0 will be French while 22.2 is British If you cant find a stamping your next option is
to measure the stem. If it measures 22 mm or less (mine measures 21.97) its French. If it measures 22.2mm
its British. Replacement French headsets are becoming difficult to find and problems arise when
replacement parts are needed. Peugeot forks can found on Ebay in like new condition for reasonable prices.
French headsets are more difficult to find and can be expensive. If your in need of a new headset there are
several solutions. Choose the one that best fits your needs.
1. Replacement French headset. Direct replacements can be found and are often expensive
2. Hybrid headset. If only the lower portion of your headset needs replacing, British headset parts will
interchange with the lower half of a French headset. The entire lower half needs to replaced as a unit.
3. Replace fork and headset. Convert to British!!!. British headsets and forks are inexpensive. A full
conversion can be done at a reasonable cost. Parts needed are:
a. Fork
b. Headset
c. Stem (British forks take a larger 22.2mm stem)
d. Handlebar (British stems take a larger diameter handlebar)
Some people like to cut corners and 'shim' a French 22.0mm stem up to the 22.2mm British size. This is
easily done by cutting a thin soda can. Remember you only need a thickness of .1mm for the shim. I'm not a
proponent of shimming stems and DO NOT recommend this technique.
Bottom Brackets
Bottom brackets can be either French, Swiss or British threaded. Left = adjustable = non-gear side. Right =
fixed = gear side.
French bottom brackets have 35x1 threading thats right hand threaded on both the adjustable (left) and fixed
(right) cups
Swiss bottom brackets have 35x1 left handed threads on the gear side (fixed) and right hand threads on the
left (adjustable) side
British bottom brackets have 1.370"x24 threading thats left handed on the gear side (fixed) and right handed
on the non-gear side (adjustable). 1.370" diameter threading converts to 34.798mm while 24 tpi converts to
a pitch of 1.058
In general if you have a 70's model Peugeot it will have French threading. Bikes produced around 1980 and
later will have either French or Swiss threading and bikes produced in the early to mid eighties will have
Swiss or British threading. Peugeots 1981 U.K. catalog clearly states a '35X1 thread L.H. fixed cup' indicating
Swiss threading. By 1986 all bikes were built with British threading. Check the cup on the gear side for a
stamping, some are marked while others are not. Swiss cups can be identified by a 'ring' on the outer
circumference of the cup or a 'gold' coloring.
All cups on the non-gear/left side un-thread in the direction the crankarms move while pedaling
French fixed cups (gear side) un-thread in the direction the crankarms move when pedaling backwards.
Swiss fixed cups un-thread in the direction the crankarm moves while pedaling forwards.
British fixed cups un-thread in the direction the crankarm moves while pedaling forwards.
If you need a replacement bottom bracket your needs change depending on the style of BB.
French bottom brackets need to replaced with French bottom brackets only.
Swiss bottom brackets should be replaced with Swiss only. British bottom brackets may fit as the threading
is very close. British cups in a Swiss frame will be a little lose or sloppy as the British thread is a slighly
smaller diameter but its also a slightly different pitch. Because of the difference in thread pitch they may not
thread all the way in. Some times they work, sometimes they dont. British bottom brackets are readily
available at any local bicycle store. French bottom brackets are now being manufactured and should be
available through your local bike store.
Derailleurs
Early Peugeot frames do not have threaded derailleur hangers. Derailleurs were attached with a fixing bolt
that threaded into the derailleur from the inside of the hanger. Beginnig in the late 70's Peugeot began
using Campagnolo style threaded derailleur hangers. Derailleurs for Campy style dropouts have either an
integral fixing bolt or a fixing bolt that threads into the derailleur through the hanger.
Early style hangers will only accept original style Simplex derailleurs as direct bolt-ons. Early style frames
can only accept Campy style derailleurs with modifications. Frames can either be drilled, tapped and filed or
a bolt-on hanger can be added.
Freewheels
Freewheels can be either British/BSA or French threading. French threaded freewheels were used through
at least 1982. B.S.A. freewheels will thread on as the diameter is larger by .1mm but may become tight and
have difficulty fully threading due to a difference in thread pitch.
French headsets have 25x1 threading which is slightly less than 1 inch (25.4mm) across with a pitch of 1
thread per mm.
British headsets have 1' (25.4mm)x24 t.p.i threading. British headsets are slighly larger in diameter than
French headsets (25.mm) with a pitch of 24 threads per inch or 1.058mm versus the French pitch of 1mm.
The easiest way to determine if your Peugeot has French or British threading is to remove the stem and
check for a stamping, 22.0 will be French while 22.2 is British If you cant find a stamping your next option is
to measure the stem. If it measures 22 mm or less (mine measures 21.97) its French. If it measures 22.2mm
its British. Replacement French headsets are becoming difficult to find and problems arise when
replacement parts are needed. Peugeot forks can found on Ebay in like new condition for reasonable prices.
French headsets are more difficult to find and can be expensive. If your in need of a new headset there are
several solutions. Choose the one that best fits your needs.
1. Replacement French headset. Direct replacements can be found and are often expensive
2. Hybrid headset. If only the lower portion of your headset needs replacing, British headset parts will
interchange with the lower half of a French headset. The entire lower half needs to replaced as a unit.
3. Replace fork and headset. Convert to British!!!. British headsets and forks are inexpensive. A full
conversion can be done at a reasonable cost. Parts needed are:
a. Fork
b. Headset
c. Stem (British forks take a larger 22.2mm stem)
d. Handlebar (British stems take a larger diameter handlebar)
Some people like to cut corners and 'shim' a French 22.0mm stem up to the 22.2mm British size. This is
easily done by cutting a thin soda can. Remember you only need a thickness of .1mm for the shim. I'm not a
proponent of shimming stems and DO NOT recommend this technique.
Bottom Brackets
Bottom brackets can be either French, Swiss or British threaded. Left = adjustable = non-gear side. Right =
fixed = gear side.
French bottom brackets have 35x1 threading thats right hand threaded on both the adjustable (left) and fixed
(right) cups
Swiss bottom brackets have 35x1 left handed threads on the gear side (fixed) and right hand threads on the
left (adjustable) side
British bottom brackets have 1.370"x24 threading thats left handed on the gear side (fixed) and right handed
on the non-gear side (adjustable). 1.370" diameter threading converts to 34.798mm while 24 tpi converts to
a pitch of 1.058
In general if you have a 70's model Peugeot it will have French threading. Bikes produced around 1980 and
later will have either French or Swiss threading and bikes produced in the early to mid eighties will have
Swiss or British threading. Peugeots 1981 U.K. catalog clearly states a '35X1 thread L.H. fixed cup' indicating
Swiss threading. By 1986 all bikes were built with British threading. Check the cup on the gear side for a
stamping, some are marked while others are not. Swiss cups can be identified by a 'ring' on the outer
circumference of the cup or a 'gold' coloring.
All cups on the non-gear/left side un-thread in the direction the crankarms move while pedaling
French fixed cups (gear side) un-thread in the direction the crankarms move when pedaling backwards.
Swiss fixed cups un-thread in the direction the crankarm moves while pedaling forwards.
British fixed cups un-thread in the direction the crankarm moves while pedaling forwards.
If you need a replacement bottom bracket your needs change depending on the style of BB.
French bottom brackets need to replaced with French bottom brackets only.
Swiss bottom brackets should be replaced with Swiss only. British bottom brackets may fit as the threading
is very close. British cups in a Swiss frame will be a little lose or sloppy as the British thread is a slighly
smaller diameter but its also a slightly different pitch. Because of the difference in thread pitch they may not
thread all the way in. Some times they work, sometimes they dont. British bottom brackets are readily
available at any local bicycle store. French bottom brackets are now being manufactured and should be
available through your local bike store.
Derailleurs
Early Peugeot frames do not have threaded derailleur hangers. Derailleurs were attached with a fixing bolt
that threaded into the derailleur from the inside of the hanger. Beginnig in the late 70's Peugeot began
using Campagnolo style threaded derailleur hangers. Derailleurs for Campy style dropouts have either an
integral fixing bolt or a fixing bolt that threads into the derailleur through the hanger.
Early style hangers will only accept original style Simplex derailleurs as direct bolt-ons. Early style frames
can only accept Campy style derailleurs with modifications. Frames can either be drilled, tapped and filed or
a bolt-on hanger can be added.
Freewheels
Freewheels can be either British/BSA or French threading. French threaded freewheels were used through
at least 1982. B.S.A. freewheels will thread on as the diameter is larger by .1mm but may become tight and
have difficulty fully threading due to a difference in thread pitch.
| Swiss cups are easily identifiable by a ring around the circumference. They may also be yellow/gold in color |
| 5 mm allen bolt threads into rear of derailleur. Tab for Campy style derailleurs can be seen below fixing bolt. |
| click image |
| click image |
| Campagnolo style hanger with tab for Campy type derailleur tang, threads and notch for Simplex style tang. |
| click image |
| Installation of a Campagnolo style derailleur requires drilling and tapping of the mounting hole followed by fabrication of a tab by grinding. A Dremel type tool can be used for grinding the tab. |
| click image |
| click image |
| An alternative to drilling, tapping and grinding is a bolt on hanger. These allow mounting of Campagnolo style derailleurs with no frame modifications.DO NOT HACK YOUR FRAME UNLESS ITS ABSOLUTELY NECESSARY |
