How to fit BB bearings to install Ultegra Crank on road bike Wilier Cento 1 I've bought a used Wilier Cento 1 carbon road bike frame (not the new Cento1SR, but the previous model). Now I would like to transfer all Ultegra 6700 groupset components from my existing bike to it. My current bike has narrower bottom bracket frame body than the Cento 1 so it uses Ultegra BB that extends from the frame. Something like this:



Wilier Cento 1 on the other hand has a wider bottom bracket body which says Wilier Oversize Bottom Bracket as seen on the image below. It's about 92-94mm wide (I haven't precisely measured it, but you know what standards are out there). This is how it looks like with fitted cranks (in this case Campagnolo):



The main question

I know I have to buy some additional BB bearings and plugs to put them directly into the frame but I don't know whether this is a kind of PressFit system so I would require some special tools to correctly install these bearing into the frame or are they just snuggly put in so I can actually do it myself without any extra tools?
Edit: frame is BB94 not 386 



Your hollowtech bb wouldn't work as you correctly identified you'd need BB386 pressfit bottom bracket, (see exploded diagram below)you'd just need to make sure the bb you choose is compatible with your chainset and yes ideally you'd need a bottom bracket press to fit this or alternatively your lbs would fit it. 

You'd need something like a bb reducer spacer kit to change your bb from bb386 to bb30...
bb386/30 converter kit

and then the pressfit bb30 bb that will accept you ht2 ultegra cranks.
FSA Reducer



bb press tool
See Also... How to service a bb30 bb