I just picked up a Cervelo P-series 105 from my LBS (my Holiday present to myself).
The bike has FSA Gossamer Pro cranks attached. Looking at the Cervelo web site, I see the bike should have come with Shimano RS510 cranks. I am not sure why they made the swap and they certainly didn’t tell me. From what I can tell- the two are comparable- so probably no issue there.
However, when I went to put on my pedals, I noticed that the BB was slightly eccentric in the BB part of the frame- the non-drive side of the BB is almost flush with the frame, while the drive side is out about 1/8th of an inch. The BB they used looks like it has some teeth on it that you would use a tool to screw down. Attached are some photos- hopefully you can see what I am talking about.
Should the two sides be symmetric or was the BB not installed properly? Is it going to affect the life of the BB? Should I bring the bike back to have the BB adjusted? Or would that just add to potential problems down the road?
Yes- the cranks do spin freely. I didn’t notice any creaking or resistance and rode the bike on a trainer for about 15 minutes and an additional 15 minutes on the street before purchase.
I also have a Giant Defy and a BMC Roadmachine which are press fit BB’s and they look flush with the frame on both sides. However- the BB on this Cervelo P-series clearly has external teeth suggesting it is some type of screw-in PF BB. I just don’t know which BB they used, but I pretty sure it is not the stock BB.
It’s the Holiday weekend, so I won’t be able to contact the store until Tuesday. Just hoping to get some info before I call them.
However- the BB on this Cervelo P-series clearly has external teeth suggesting it is some type of screw-in PF BB. I just don’t know which BB they used, but I pretty sure it is not the stock BB.
Yes, it’s threaded. Actually, I think on that bike that the drive-side it is reverse threaded. You tighten by going counter clockwise. If it looks like they need to use a lot of force to fully seat it, it may be cross-threaded. Be careful! https://www.parktool.com/en-us/blog/repair-help/bottom-bracket-removal-installation-threaded
I just picked up a Cervelo P-series 105 from my LBS (my Holiday present to myself).
The bike has FSA Gossamer Pro cranks attached. Looking at the Cervelo web site, I see the bike should have come with Shimano RS510 cranks. I am not sure why they made the swap and they certainly didn’t tell me. From what I can tell- the two are comparable- so probably no issue there.
However, when I went to put on my pedals, I noticed that the BB was slightly eccentric in the BB part of the frame- the non-drive side of the BB is almost flush with the frame, while the drive side is out about 1/8th of an inch. The BB they used looks like it has some teeth on it that you would use a tool to screw down. Attached are some photos- hopefully you can see what I am talking about.
Should the two sides be symmetric or was the BB not installed properly? Is it going to affect the life of the BB? Should I bring the bike back to have the BB adjusted? Or would that just add to potential problems down the road?
Any advice or guidance would be appreciated.
Thanks!
Your Cervelo has a BBRight bottom bracket shell. It is asymmetric. It is 79mm wide vs typical 90mm with the offset on the DS which is where a spacer is placed on spindle to get total width up to 90mm. If you are worried try measuring from backside of each crankarm while lined up with downtube.
ETA: this should be a PF bottom bracket shell and the BB notches are for a screw together BB assembly.
It is really hard for a bicycle manufacturing company to mess up the installation of a bottom bracket, especially when they install the same one hundreds or thousands of time every day.
This is correct. One side is thicker to center the crank in the frame. Generally a good rule of thumb, if your crank isn’t binding and you’re not able to move the crankarm back and forth, nothing to worry about here.
