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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:

Ultegra 6700 BB

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):

Wilier Oversize Bottom Bracket

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?

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  • Regarding your comment about "special tools", for any PF bottom bracket, a bearing press should be used for installation. Trying to force them in by hand or otherwise can cause uneven installation or a damaged bearing. I speak from experience, unfortunately.
    – Ben Siver
    Apr 2, 2015 at 15:05
  • Yes I replaced my press fit BB 18 months ago. A special tool is required for removal, and another one for installation. A bit of a rip off, but easy enough to do. I found both Park and Shimano did the tools, very little difference between them in price.
    – PeteH
    Apr 2, 2015 at 20:10
  • AFAIK there're tools sets that come for both. Installation and removal.
    – Robert Koritnik
    Apr 3, 2015 at 8:29
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    @RobertKoritnik: that's true, if you buy the Park Tool removal tool for a BB86/BB30 bottom bracket, it comes with properly sized metal bushings that can also be used along with a bearing press for installation.
    – Ben Siver
    Apr 6, 2015 at 18:02
  • I have the same problem as yours. My bike frame is Imperiale with Campagnolo crankset but now I am changing it to Shimano 6800. The bottom bracket does not fit to the Shimano one. Did you solve your problem at the end? I don't even know what key words I should use to search the bearing cups for fit the Shimano crankset. BB94 seems for MTB only?
    – Yang
    Feb 13, 2020 at 15:05

1 Answer 1

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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

bb386 exploded

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

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