pghbikedude

I have a Shimano Ultegra 6700 Groupset that I am planning to use to build out another bike. The bottom bracket is English and I want to install it on a Cervelo R3 that is BBright.

Do I just need this?
https://www.pricepoint.com/Brand/TruV...FecRMwodM0kAmw

And... do i just place this inside the existing bottom bracket. I'm assuming English is smaller than BB30 right?

Thanks!

Campag4life

Nope...don't get that one...won't work.

First, lets address what Cervelo's BBright is. BBright is PF30 but 11mm longer at 79mm wide. Will your Ultegra 6700 crank fit? Yup.
How do you get it to mount?
If you just have the R3 frameset with no extra bushings...you need some. Basically you have a 79mm wide BB shell. PF30 cups are pushed into each side of the shell. Then press in a BB30 bearing into each PF30 composite (Delrin) cup. Now you have to fit your 24mm spindle diameter to the BB30 bearing ID. This 6mm diameter difference is taken up with spacers commonly used to adapt Shimano cranks to BB30 but with different thickness because BBright is 11mm wider than BB/PF30. If you have any question about what spacers, send an email to Wheel Manufacturing...their site shows many applications but asking their customer service will take the guess work out.

That is all there is to it. Your frame may already have std PF30 bushings pressed in with BB30 bearings pressed into respective sides. If this is the case, then all you need are the Wheel Manufacturing Adapters.

Mounting a DA or Ultegra crank to a Cervelo with BBright is a popular practice. Btw, a BB30 crank that has the same diameter spindle as the bearings that go in your frame will NOT mount to your frame...it is too short.

HTH.

primov8

OP, save yourself the headache and just buy the Rotor 4624 bottom bracket. Just like a PF30 bb, but no adapters needed as the bearings are sized to accommodate 24mm spindled cranksets.

Campag4life

You want to pay for it?
I see the integrated solution proposed all the time. Integrated solutions have a cost. Also bearings are captured and not serviceable. When a bearing goes the entire BB needs to be replaced. All BBright is...is a stretched version of PF30. PF30 parts are cheap. Wheel Mfg adapters...once purchased will likely last the life of a frame...and by far the most common approach to mount external bearing cranks on BB/PF30 bikes.

So OP...be careful what you wish for. If you go plug and play you will pay for it...about 2 X's more expensive than PF30 with adapters and about 4 x's more expensive for the second BB versus buying the adapters which don't wear out.

Lastly, std 4624 will not fit BBright. OP, if you drop the 80 bux for this solution, the correct part number is 4624L....L is for the 79mm shell width.