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@SpamJav
Cheers, though sadly they don't come long enough for my (possibly ancient) cranks.
I'm a bit confused by "If you install an ISO crank on a J.I.S. spindle, it will sit about 4.5 mm farther out than it would on an ISO spindle of the same length." -Sheldon
Surely the problem I'm having is the cranks are sitting too far IN?
Really need my bike back on the road, so just going to order a JIS BB with a longer spindle tonight (finding it impossible to find a ISO one of the right length). This is all getting a little esoteric for me so considering the original is 118, should I go for 122 or even 127? Some pictures below of the crank on the new BB (and the contact between the ring and the chainstay).
Cheers, everyone.