So I've got ekar chainset and pro tech bb, didn't have a correct bearings so fitted 6805 which are 7mm width, because its 1mm wider than original I've got +2mm over. Cannot see if it's pulling enough both chainset pieces. Do think it's safe? And did anyone tried similar combination before?
For those who don't know, Campagnolo cranks use a non-standard version of the 6805 bearing that's 1mm thinner than the standard bearing. Thus, the standard bearings will push everything 1mm outward on each side.
Modern cranksets will not tolerate that amount of change in the system. Campy and Shimano cranks require a splined interface to engage. If you add 2mm of clearance into the system, the spline won't be fully engaged. Now imagine that you are pedaling. Almost all riders probably cruise at well over 100W of power, and peak power during a sprint is much higher. If you put that amount of power into a splined system that isn't engaged fully, the splines are going to get damaged.
For SRAM cranks, there is a preload adjuster to take up variations in BB width that are within the allowed tolerance of the system. However, it is not going to be designed to take up 2mm additional slack - that's the difference between the widths of BSA and Italian BB shells. Basically, the same issue will happen.