What type of bottom bracket shell does your frame have?

BBright connect 24x90

You might want to change your chainring sizes along with the crank arm length change to keep the Gain ratios the same (i.e. your cadence will change with the shorter crank length, but by also changing chainring sizes and/or cassette you can keep the distance your foot travels relative to the distance the bike travels the same. See here for a longer explanation by the extraordinary Sheldon Brown). Luckily Sheldon's old calculator is still available here.

Your frame has a BBright bottom bracket shell.

"24x90" means that the bottom bracket bearings/adaptor is for Shimano cranksets.

How do I find this shell information, name, or size? Wow didnt realize how confusing these bottom brackets are

"How do I find this shell information, name, or size?"


You already said it was BBright.

That's all you need to know about your frame.

Now you decide on which crankset you want that will fit it.

Thanks, guess im overthinking lol

Have you considered getting a crankset with an integrated power meter?

No do those come in 150 or 155 size. If so what brands?

Rotor.

Power meters only start at 165 single and dual sided at Rotor.

https://rotoramerica.com/...-includes-chainrings

Thanks missed that! Probably because of the cost to set this up. Will probably go with the no power meter option for now. Any knowledge of the JCobb carbon short crankset? They have 150s opposed to 155s for Rotor both about $600.

I've used a Power2max power meter with rotor cranks for years now trialling between 150-170 and never had an issue with their power meters. Just but the compatible crank power meter spider to give you the flexibility to change crank lengths. I would make sure I buy the new Aldhu Rotor cranks when you do buy them.

https://www.power2max.com/en/product/ngeco-rotor-aldhu-power-meter-set-road/

Rotor has 150mm cranks...

https://rotoramerica.com/...ks/products/aldhu-3d

30 axel 150 24 smallest is 155

BBright is based on a 30mm axle.

my head is ready to explode with these f-----n bottom brackets. more confused now

There is nothing to be confused about.

BBright is simply 11mm wider than Pressfit30.

I have a 2019 Felt IA16 (I'm pretty sure that has same BB design as your Cervelo). Not long after I bought it, I swapped out the stock crankset for a 155 crank with full compact (50/34) chain rings. At the time I made the switch, Cobb and Rotor were the only sources for 155 cranks (and, based on your OP, sounds like they still are).

I was told that the Rotor cranks were higher quality, but also much more expensive. I chose the Cobb cranks. My LBS handled all the install. Took a few adjustments at first to get the front derailleur shifting dialed in, but no issue since then. Been very happy with the shorter cranks - really like making smaller circles with my legs (for reference, I'm 5' 7", with 30" inseam).

Power meters on the cranks weren't a factor for me, as I already had Assioma Duo power meter pedals.

Hope your purchase works our well for you!

BUT, lots of companies make BBs that’ll fit in a BBRight (Cervelo) frame. I currently have a BB from Wheels Manufacturing set up for GXP, which could be used for Shimano by swapping out the left side bearing. Could also go DUB with the right bearings.

OP was under the impression that they could only use a crankset with a 24mm axle.

Not sure how you came to that conclusion. All they said is that it’s currently set up for 24mm spindles. In fact, given the admitted confusion about BB standards, I would guess the OP couldn’t possibly conclude it would only take a 24mm spindle.

Post #14 basically says that the OP wants 150mm cranks.

Post #17, OP basically says that 150mm cranks are only available with a 30mm axle and not a 24mm axle.

In post #19, OP is perplexed that BBright is based on a 30mm axle.

I am pretty sure that if you ask the OP what their thought process was, it would fit my analysis.