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@ghettro
Full post here https://smutpedaller.blogspot.co.uk/2016/12/bish-bash-bosh-part-7-teething-issues.html
In the course of this build up I had to do some replacement of worn out bits, the Campag drivetrain I had was originally bought in 2010 and had quite a lot of mileage on it at this point. After replacing the bearings previously, I had to replace the chainrings too. However this was a lot easier said than done, as the availability and fit of replacement rings was not so clear...
Firstly Campagnolo changed the chainring bolt design on later cranks, going from two piece bolts as per standard, to bolt that threads directly into the small ring. New vs Old:
Secondly because of Campagnolo's hidden bolt design, and proprietary BCD pattern (the hidden bolt is offset at 112mm while the others are all 110mm on a compact crank) you are limited in choice. This is the bit that screwed me up as unbeknownst to me, the 2010 Athena Carbon CT cranks are a bit oddball and actually have a different chainring fit to the Chorus/Record cranks of the same year despite having a very similar appearance.
Due to cost and availability I ended up buying the Stronglight CT2 chainrings which are meant specifically for Campagnolo cranks... they even have a milled out section where the hidden bolt goes... fantastic I thought....
However the milled out bit was too thick and caused the crank to not sit flat on the spider... Also in small-small combination the shift pins would pick up the chain, indicating that the chainring was not sitting too far inboard...
So I had to mill it out that pad a bit and add thin 0.6mm spacers to get the big ring out to prevent that...
Looking good...
