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#1
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BB with Chorus crankset?
I just purchased a second-hand 9/10 speed Chorus crankset, not sure of the
exact vintage, but it looks very much like the current aluminum model. Can I use a 107mm (single speed chain line is perfect) square taper Shimano bottom bracket with this, or does it HAVE to be a Campy BB? TIA! Basjan |
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#2
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BB with Chorus crankset?
On Tue, 23 Aug 2005 18:01:40 +0200, "Jean Pasquet"
wrote: A 107 mm Shimano = chainline with Chorus of 111 mm; but, Chorus is a 102 chainline. I think that the older Chorus cranks, that used a spindle, do fine with a 111 ISO or 107 JIS. I recall that they frequently don't say Chorus on them. |
#3
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BB with Chorus crankset?
On Tue, 23 Aug 2005 18:58:32 +0200, "Jean Pasquet"
wrote: I think that the older Chorus cranks, that used a spindle, do fine with a 111 ISO or 107 JIS. I recall that they frequently don't say Chorus on them. Yes, it is ! But, it's old ! How years ? I have a crankset that I think is a 1991 vintage. There is no Chorus logo and the cranks use a self extracting hex bolt that uses a 7 mm hex key. This crankset would use a Campy 111 bb, i.e. AC-H. A 'b' fit would be an JIS 107 mm. |
#4
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BB with Chorus crankset?
"Jean Pasquet" wrote in message
news:mn.bc397d588fc99c1f.20929@Cycles... Bonjour, Basjan a écrit dans son message : I just purchased a second-hand 9/10 speed Chorus crankset, not sure of the exact vintage, but it looks very much like the current aluminum model. Can I use a 107mm (single speed chain line is perfect) square taper Shimano bottom bracket with this, or does it HAVE to be a Campy BB? No ! Shimano bottom bracket is square JIS and Campagnolo is ISO. A 107 mm Shimano = chainline with Chorus of 111 mm; but, Chorus is a 102 chainline. It is thus necessary to put a bottom bracket of 102 Campagnolo or Stronglight, for example. The chain line is sorted out, since it a single speed with a little more options in "line choice" than a geared bicycle. But the spindle-fit itself is what I am interested in. I just did a quick fit-test (Chorus crankset with Shimano BB) and it seems fine?! Basjan |
#5
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BB with Chorus crankset?
Paul Kopit wrote: On Tue, 23 Aug 2005 18:01:40 +0200, "Jean Pasquet" wrote: A 107 mm Shimano = chainline with Chorus of 111 mm; but, Chorus is a 102 chainline. I think that the older Chorus cranks, that used a spindle, do fine with a 111 ISO or 107 JIS. I recall that they frequently don't say Chorus on them. If it's a '9/10s' crank, then made 1997 and later and indeed used a ISO, 102mm spindle. Chorus that used 111mm was last made in 1994. |
#6
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BB with Chorus crankset?
Basjan wrote: I just purchased a second-hand 9/10 speed Chorus crankset, not sure of the exact vintage, but it looks very much like the current aluminum model. Can I use a 107mm (single speed chain line is perfect) square taper Shimano bottom bracket with this, or does it HAVE to be a Campy BB? TIA! Basjan Using a larger shimano taper will enlarge the taper of the crank, not the best solution. Ideal is the 102mm Campag taper BB. |
#7
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BB with Chorus crankset?
"Qui si parla Campagnolo" wrote in message oups.com... Basjan wrote: I just purchased a second-hand 9/10 speed Chorus crankset, not sure of the exact vintage, but it looks very much like the current aluminum model. Can I use a 107mm (single speed chain line is perfect) square taper Shimano bottom bracket with this, or does it HAVE to be a Campy BB? TIA! Basjan Using a larger shimano taper will enlarge the taper of the crank, not the best solution. Ideal is the 102mm Campag taper BB. Not to be a stickler, but I found this on Sheldon´s site: "Yet another source claimed that the squares of Campa, Mavic and Stronglight (ISO) are smaller than Shimano and Suntour (JIS) with the result that JIS cranks will move about 4.5 mm further in. This may conflict with the end of the square and result in a loose fit or braking stress. for ISO cranks on JIS squares there's less contact area between crank and spindle, since the crank does not slip perfectly on the spindle. The result again is a higher risk of braking the crank. But assuming those 4.5 mm and 2 deg, ISO is about 0.3 mm smaller than JIS (2 * sin 2 * 4.5 = 0.3)?ISO cranks (Campagnolo, Stronglight, others) won't go as far onto J.I.S. spindles as they ideally should. J.I.S. cranks (most Japanese models) may bottom out if installed on ISO spindles. In practice, you can very often get away with mixing these sizes, as long as you select an axle length that gives the desired chainline. " Since I have a longer (107mm JIS) than required (102mm; ISO) axle on there, does that mean that the combination of Chorus x 107 JIS will at least be safe? Thanks again. Basjan |
#8
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BB with Chorus crankset?
Basjan wrote: the best solution. Ideal is the 102mm Campag taper BB. Not to be a stickler, but I found this on Sheldon´s site: "Yet another source claimed that the squares of Campa, Mavic and Stronglight (ISO) are smaller than Shimano and Suntour (JIS) with the result that JIS cranks will move about 4.5 mm further in. This may conflict with the end of the square and result in a loose fit or braking stress. for ISO cranks on JIS squares there's less contact area between crank and spindle, since the crank does not slip perfectly on the spindle. The result again is a higher risk of braking the crank. But assuming those 4.5 mm and 2 deg, ISO is about 0.3 mm smaller than JIS (2 * sin 2 * 4.5 = 0.3)?ISO cranks (Campagnolo, Stronglight, others) won't go as far onto J.I.S. spindles as they ideally should. J.I.S. cranks (most Japanese models) may bottom out if installed on ISO spindles. In practice, you can very often get away with mixing these sizes, as longas you select an axle length that gives the desired chainline. " Since I have a longer (107mm JIS) than required (102mm; ISO) axle on there, does that mean that the combination of Chorus x 107 JIS will at least be safe? It'll be safe. I have done this a few times, use a Campag crank on a shimano BB, for a variety of reasons, mostly because the crank flats had been largened by the larger BB spindle. |
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