Stronglight 99 question
#1
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Stronglight 99 question
Messing around a little during recovery and I had my daughter bring a couple of cranksets to me for inspection and clean up. One is a Peugeot branded Stronglight 99 with 52/40 chain rings. I know this is an 86bcd crankset. The outer ring has 2 extra holes in it. I'm assuming the furthest one out would have been for a chain protector. But what about the middle hole?
I've had this crankset in a drawer for awhile and never really looked at it. The outer hole in the big ring is countersunk on the back side but the middle hole is not on either ring.
Any wisdom in why the extra holes are there?
I've had this crankset in a drawer for awhile and never really looked at it. The outer hole in the big ring is countersunk on the back side but the middle hole is not on either ring.
Any wisdom in why the extra holes are there?
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1984 Gitane Tour de France; 1968 Peugeot PL8; 1982 Nishiki Marina 12; 1984 Peugeot PSV; 1993 Trek 950 mtb; 1983 Vitus 979; Colnago Super, mid-80's Bianchi Veloce, 1984 or 85 Vitus 979
1984 Gitane Tour de France; 1968 Peugeot PL8; 1982 Nishiki Marina 12; 1984 Peugeot PSV; 1993 Trek 950 mtb; 1983 Vitus 979; Colnago Super, mid-80's Bianchi Veloce, 1984 or 85 Vitus 979
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Messing around a little during recovery and I had my daughter bring a couple of cranksets to me for inspection and clean up. One is a Peugeot branded Stronglight 99 with 52/40 chain rings. I know this is an 86bcd crankset. The outer ring has 2 extra holes in it. I'm assuming the furthest one out would have been for a chain protector. But what about the middle hole?
I've had this crankset in a drawer for awhile and never really looked at it. The outer hole in the big ring is countersunk on the back side but the middle hole is not on either ring.
Any wisdom in why the extra holes are there?
I've had this crankset in a drawer for awhile and never really looked at it. The outer hole in the big ring is countersunk on the back side but the middle hole is not on either ring.
Any wisdom in why the extra holes are there?
https://www.google.com/search?q=stro...nt=firefox-b-1
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this set is the second generation "G2" or "Mk.II" edition created by Ets. Verot-Perrin reworking the original in 1981
the outer C/W is mis-mounted in that the small hole is supposed to go under the crank arm, it is threaded and takes a small bolt with spacer/sleeve which is designed to keep the chain from wedging between the arm and chainwheel in derailments to the outside
here is the manufacturer's catalogue page showing the model 99BIS of 1982. the holes are just there for lightening/appearance.
-----
this set is the second generation "G2" or "Mk.II" edition created by Ets. Verot-Perrin reworking the original in 1981
the outer C/W is mis-mounted in that the small hole is supposed to go under the crank arm, it is threaded and takes a small bolt with spacer/sleeve which is designed to keep the chain from wedging between the arm and chainwheel in derailments to the outside
here is the manufacturer's catalogue page showing the model 99BIS of 1982. the holes are just there for lightening/appearance.
-----
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#4
Slowfoot
-----
this set is the second generation "G2" or "Mk.II" edition created by Ets. Verot-Perrin reworking the original in 1981
the outer C/W is mis-mounted in that the small hole is supposed to go under the crank arm, it is threaded and takes a small bolt with spacer/sleeve which is designed to keep the chain from wedging between the arm and chainwheel in derailments to the outside
here is the manufacturer's catalogue page showing the model 99BIS of 1982. the holes are just there for lightening/appearance.
-----
this set is the second generation "G2" or "Mk.II" edition created by Ets. Verot-Perrin reworking the original in 1981
the outer C/W is mis-mounted in that the small hole is supposed to go under the crank arm, it is threaded and takes a small bolt with spacer/sleeve which is designed to keep the chain from wedging between the arm and chainwheel in derailments to the outside
here is the manufacturer's catalogue page showing the model 99BIS of 1982. the holes are just there for lightening/appearance.
-----
#5
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-----
this set is the second generation "G2" or "Mk.II" edition created by Ets. Verot-Perrin reworking the original in 1981
the outer C/W is mis-mounted in that the small hole is supposed to go under the crank arm, it is threaded and takes a small bolt with spacer/sleeve which is designed to keep the chain from wedging between the arm and chainwheel in derailments to the outside
here is the manufacturer's catalogue page showing the model 99BIS of 1982. the holes are just there for lightening/appearance.
-----
this set is the second generation "G2" or "Mk.II" edition created by Ets. Verot-Perrin reworking the original in 1981
the outer C/W is mis-mounted in that the small hole is supposed to go under the crank arm, it is threaded and takes a small bolt with spacer/sleeve which is designed to keep the chain from wedging between the arm and chainwheel in derailments to the outside
here is the manufacturer's catalogue page showing the model 99BIS of 1982. the holes are just there for lightening/appearance.
-----
As mentioned, the outer of the three large holes on the big ring is countersunk on the back. I can't figure out the purpose unless it's for a chain guard. If those extra large holes are there to save weight then why would you make them that big. Just looks awkward like that. But, that's also personal opinion. I like that you could make a decent compact double with a combination of rings but... those extra holes, ugh.
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1984 Gitane Tour de France; 1968 Peugeot PL8; 1982 Nishiki Marina 12; 1984 Peugeot PSV; 1993 Trek 950 mtb; 1983 Vitus 979; Colnago Super, mid-80's Bianchi Veloce, 1984 or 85 Vitus 979
1984 Gitane Tour de France; 1968 Peugeot PL8; 1982 Nishiki Marina 12; 1984 Peugeot PSV; 1993 Trek 950 mtb; 1983 Vitus 979; Colnago Super, mid-80's Bianchi Veloce, 1984 or 85 Vitus 979
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Actually, may have found part of the answer to the outer hole and the countersink on the back of the ring from the photo of the bike I this came off I acquired a couple of years ago. This is how it was on the bike.
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1984 Gitane Tour de France; 1968 Peugeot PL8; 1982 Nishiki Marina 12; 1984 Peugeot PSV; 1993 Trek 950 mtb; 1983 Vitus 979; Colnago Super, mid-80's Bianchi Veloce, 1984 or 85 Vitus 979
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The five 10 mm holes outboard of the 86 mm BCD holes are at 122 mm BCD. This means a 99 ring of that type can be used as a middle "triplizer" ring on a Stronglight 93 or other 122 BCD crank. I don't think they intended for it to be used that way, it's just a happy accident. I think they had the die for punching holes at 122 mm, so some clever industrial designer said "eh, why not just punch some holes there with this punch we have already, little lighter and looks nice..."
To use it as a triplizer, you need to counterbore the 122 mm holes, or else the chain will hang up on the protruding head of the chainring nuts. You also need to saw off the five little shelves on the backside of the spider arms on the 93 crank, similar to making it into a track or 1x crank. Here's a modest example:
Mark B in Seattle
To use it as a triplizer, you need to counterbore the 122 mm holes, or else the chain will hang up on the protruding head of the chainring nuts. You also need to saw off the five little shelves on the backside of the spider arms on the 93 crank, similar to making it into a track or 1x crank. Here's a modest example:
Mark B in Seattle
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He is referring to the outer ring being clocked incorrectly. The hole for the chain stop pin, visible at 3:30 in your photo, should line up with the crank arm. Minor issue, since the pin is missing anyway.
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The five 10 mm holes outboard of the 86 mm BCD holes are at 122 mm BCD. This means a 99 ring of that type can be used as a middle "triplizer" ring on a Stronglight 93 or other 122 BCD crank. I don't think they intended for it to be used that way, it's just a happy accident. I think they had the die for punching holes at 122 mm, so some clever industrial designer said "eh, why not just punch some holes there with this punch we have already, little lighter and looks nice..."
To use it as a triplizer, you need to counterbore the 122 mm holes, or else the chain will hang up on the protruding head of the chainring nuts. You also need to saw off the five little shelves on the backside of the spider arms on the 93 crank, similar to making it into a track or 1x crank. Here's a modest example:
Mark B in Seattle
To use it as a triplizer, you need to counterbore the 122 mm holes, or else the chain will hang up on the protruding head of the chainring nuts. You also need to saw off the five little shelves on the backside of the spider arms on the 93 crank, similar to making it into a track or 1x crank. Here's a modest example:
Mark B in Seattle
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1984 Gitane Tour de France; 1968 Peugeot PL8; 1982 Nishiki Marina 12; 1984 Peugeot PSV; 1993 Trek 950 mtb; 1983 Vitus 979; Colnago Super, mid-80's Bianchi Veloce, 1984 or 85 Vitus 979
1984 Gitane Tour de France; 1968 Peugeot PL8; 1982 Nishiki Marina 12; 1984 Peugeot PSV; 1993 Trek 950 mtb; 1983 Vitus 979; Colnago Super, mid-80's Bianchi Veloce, 1984 or 85 Vitus 979
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