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@terlg
So I've got a wee bit of an issue with flex in the vicinity of the bb area. I thought I'd pop a quick question on here to see if anyone knows anything before I start swapping out parts to figure it out.
To set the scene, this issue is with an 80s carlton 531 frame and what currently happens is the chainring moves from left to right when I apply pressure on the pedals. It needs a fair bit of force to induce the movement, which means to see it I must look down whilst pedalling, so its a bit tricky to pinpoint whats going on.
From what I can tell however, it happens more when I apply force to the drive side, and it may even be the case that it doesn't happen to the left at all and the movement is just it returning to centre. Whats more annoying is the chainring is perfectly straight when going along at a normal pace, but when in higher gears, with the application of extra force, it results in the chain rubbing the front derailleur and I can't move the derailleur out any more as the crank would hit it...
The cranks are a set of old super records and the bb is a second hand campagnolo one i got off of here not too long ago, but the issue was there with the old bb too, so I'm assuming its could be the frame?
If anyone has any ideas they would be much welcomed.