I
Irish John
Guest
I have two problems to report. I have built several Honda \Grubee frame mounts on the Schwinn Deluxe 7 spd with nexus hub. The 44T chain ring that is supplied with the kits is never quite round (see attached picture) and this means that on a geared or single speed hub the chain tightness will vary. I've known for a long time that the rear sprockets aren't quite round but this hasn't affected the running of the bike much. On a coaster hub the varying chain tension causes the chain to come off when pedalling hard up hills. When the chain comes off a derailleur it's a synch to fix but no so with a coaster hub. You have to undo the coaster brake and undo the wheel nuts and slide the wheel forwards enough to get the chain to ride back over the chainring. Has anyone else noticed this problem? Taking a lot of care aligning the chainring with the rear sprocket helps to get the pedal chain to stay on but the varying tension only causes the chain to come off when it is under a lot of load. The lack of roundness in the chainring makes a lot of difference to the chain tension even though it is only miniscule the chain needs to be good and tight on a coaster hub. The coaster brake fails of course when the chain comes off.
The other problem is that the shaft bushing on a recent Grubee kit was not a good fit with the clutch bell housing and there was lateral play between the bell housing and the bushing. I'm not referring to the play inwards and outwards along the shaft that is fairly common on all kits and pretty easy to fix but a play at right angles from the shaft because the fit between the bell housing and the bushing isn't engineered well enough. This is the first timeI have encountered this problem and I will try to get a new bushing to see if it fixes the problem. If not the problem must lie with the bell housing itself.
The other problem is that the shaft bushing on a recent Grubee kit was not a good fit with the clutch bell housing and there was lateral play between the bell housing and the bushing. I'm not referring to the play inwards and outwards along the shaft that is fairly common on all kits and pretty easy to fix but a play at right angles from the shaft because the fit between the bell housing and the bushing isn't engineered well enough. This is the first timeI have encountered this problem and I will try to get a new bushing to see if it fixes the problem. If not the problem must lie with the bell housing itself.