Clusters and deraileurs?
08-28-05, 02:15 AM
#1
sundy hopeful
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I posted this on the 'Bike Mech's' forum but got no response. Anyone here care to comment?
I'm riding an '87, 6sp Shimano, steel road bike as a trainer/commuter. It's quite a nice bike weighing in at around 10kg, not bad for a bike of this vintage. It's in excellent condition having done very little work. I currently have it set up with TT bars and I've actually done a couple of races on it.
Recently I've been playing with clusters and bar-end shifters. I bought a 7sp Shimano set (turned out to be 8sp) off Ebay and two clusters, a Suntour 12/18 and a Shimano 12/23. The 12/23 works very well but the Suntour has very wide teeth which seem to make the shifting laboured and the chain really struggles to shift onto the 18t sprocket. I adjusted the limit screw to the point where the cage interfered with the spokes but it still wouldn't shift consistently.
I notice that the deraileur has some play in the mounting bolt bearing and the top idler has side play. I'm hoping a new derailer will help but I wonder about the width/thickness of the teeth on the cluster. I also thought about a 1 or 2mm spacer inside the cluster to keep it a bit further out on the hub.
Any advice would be much appreciated.
P.S. Could someone recommend a replacement deraileur.
I'm riding an '87, 6sp Shimano, steel road bike as a trainer/commuter. It's quite a nice bike weighing in at around 10kg, not bad for a bike of this vintage. It's in excellent condition having done very little work. I currently have it set up with TT bars and I've actually done a couple of races on it.
Recently I've been playing with clusters and bar-end shifters. I bought a 7sp Shimano set (turned out to be 8sp) off Ebay and two clusters, a Suntour 12/18 and a Shimano 12/23. The 12/23 works very well but the Suntour has very wide teeth which seem to make the shifting laboured and the chain really struggles to shift onto the 18t sprocket. I adjusted the limit screw to the point where the cage interfered with the spokes but it still wouldn't shift consistently.
I notice that the deraileur has some play in the mounting bolt bearing and the top idler has side play. I'm hoping a new derailer will help but I wonder about the width/thickness of the teeth on the cluster. I also thought about a 1 or 2mm spacer inside the cluster to keep it a bit further out on the hub.
Any advice would be much appreciated.
P.S. Could someone recommend a replacement deraileur.
08-28-05, 07:48 AM
#2
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Originally Posted by berny
I posted this on the 'Bike Mech's' forum but got no response. Anyone here care to comment?
I'm riding an '87, 6sp Shimano, steel road bike as a trainer/commuter. It's quite a nice bike weighing in at around 10kg, not bad for a bike of this vintage. It's in excellent condition having done very little work. I currently have it set up with TT bars and I've actually done a couple of races on it.
Recently I've been playing with clusters and bar-end shifters. I bought a 7sp Shimano set (turned out to be 8sp) off Ebay and two clusters, a Suntour 12/18 and a Shimano 12/23. The 12/23 works very well but the Suntour has very wide teeth which seem to make the shifting laboured and the chain really struggles to shift onto the 18t sprocket. I adjusted the limit screw to the point where the cage interfered with the spokes but it still wouldn't shift consistently.
I notice that the deraileur has some play in the mounting bolt bearing and the top idler has side play. I'm hoping a new derailer will help but I wonder about the width/thickness of the teeth on the cluster. I also thought about a 1 or 2mm spacer inside the cluster to keep it a bit further out on the hub.
Any advice would be much appreciated.
P.S. Could someone recommend a replacement deraileur.
I'm riding an '87, 6sp Shimano, steel road bike as a trainer/commuter. It's quite a nice bike weighing in at around 10kg, not bad for a bike of this vintage. It's in excellent condition having done very little work. I currently have it set up with TT bars and I've actually done a couple of races on it.
Recently I've been playing with clusters and bar-end shifters. I bought a 7sp Shimano set (turned out to be 8sp) off Ebay and two clusters, a Suntour 12/18 and a Shimano 12/23. The 12/23 works very well but the Suntour has very wide teeth which seem to make the shifting laboured and the chain really struggles to shift onto the 18t sprocket. I adjusted the limit screw to the point where the cage interfered with the spokes but it still wouldn't shift consistently.
I notice that the deraileur has some play in the mounting bolt bearing and the top idler has side play. I'm hoping a new derailer will help but I wonder about the width/thickness of the teeth on the cluster. I also thought about a 1 or 2mm spacer inside the cluster to keep it a bit further out on the hub.
Any advice would be much appreciated.
P.S. Could someone recommend a replacement deraileur.
08-30-05, 01:28 AM
#3
sundy hopeful
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Originally Posted by sydney
Well, if the 12/23 works and the 12/18 doesn't, then maybe the 12/18 needs to go back to ebay? It isn't a derailer issue. Use any shimano index SIS RD other than a pre 9 speed DA( if your 8 shifter is a DA,then you have to use a pre 9 speed DA RD with it.)...... The fact that you are using 8 speed shifters doesn't help as shimano 8 speed cog sapcing is 4.8mm, and 7 speed is 5.0mm. Suntour spacing was likely something even different.
I've done a little work on the teeth with my rotory tool, grinding some angles on the front inside of the teeth to better facilitate shifting and it's working quite well now with just the odd slow shift.
Thanks again for your help.
Bern
