[giro]

Hi guys,
My story started since I started my TT bike project more than 4 months ago. during studying of frame geo, I collected parts I will need for making my 2nd bike, 1st TT. One of the component I got (which I thought it must be cool on my bike!) is FSA aluminum aero crank. I got FSA aluminum aero 54T ring in great condition and good price, then I got FSA aluminum cheap crank without BB.
ok, I got crank, I will got BB later.......

For a week, I 've been searched for the BB, which BB ??
.....Some said the crank will fit with Shimano BB system(24mm). Unfortunately, many said the FSA aluminum won't fit the Shimano. It will fit FSA BB or Truvative low rank BB which is small axle. Then I searched in the internet again. Found that the crank I have is "FSA Energy Aluminum crank" Hornestly, I just figure out 20 minutes ago after I took a look at the crank that my crank is Energy model, not Isis or gossamer.

What is "FSA Energy"? How is it placed in the FSA line? And the most important, which BB should I get?? I found this crank oftenly come with MegaEXO BB, but also found very few with Shimano BB system. Is it 24mm axle and can fit with Shimano BB?

I found some information that the Energy model is the mid rank between 105 and Ultegra and fairly stiff in pretty good weight. The model was born before FSA launched external BB system lik MegaEXO. I may be the reason why I found the Energy crank come with Shimano and MegaEXO BB. The question is how can I know which BB is for my crank??

please share me some experiences and give me some information of the part.
I 'm feeling like I am a realy stupid tried to make a low-cost aero crankset!! Not only it will never look as cool as top level aero crank, it lead me so many trouble.

 

[Crawf]

Fsa Bb-6000.

 

[giro]

Fsa Bb-6000.

thank you!!
searched from what you post. I found that BB-6000 is for gossamer and 110BCD energy only
please come and share

ps.some said MegaEXO and Shimano 7900 BB is compatible for each other, true??

 

[orlin03]

Good luck with your build! My TT bike was the first bike I built from scratch, and it was worth it. I also use FSA TT rings, which makes me wonder if you got the matching little ring for your 54t; I believe the TT rings are all ramped for a 42t small ring (I know mine is) and won't shift right with a 39.
I've ridden the Energy crank (ISIS) before and did not think it fell between a 105 and Ultegra level, but a) I am comparing it to the modern versions of Shimano cranks with outboard bearings, and b) much, if not all, of the fault I found in the crank was with the rings, which I felt were flexy and shifted very poorly. With a good set of TT rings, I'm sure your budget crank will perform fine.

 

[wim]

I've ridden the Energy crank (ISIS) before and did not think it fell between a 105 and Ultegra level

Correct, it appeared to be well below 105. As a matter of fact, the ISIS Energy was rebranded by Nashbar to be their house-brand economy compact crank some years ago. I had one and thought it was, well, OK. But there's FSA Energy ISIS and FSA Energy MegaExo now, and the cranks (not just the BBs) are very different.

 

[Jim311]

If it's MegaExo, then it is compatible with Shimano external BBs as well as Race Face. Truvativ uses a stepped down axle and is not compatible with other brands.

 

[giro]

Thank you guys,
So there 're Energy ISI and the current Energy which is placed over Gossamer. What is the different between these two Energy?
Also, how to specified which Energy I have? If it is 24mm crank axle, can I assume that it is external bracket such as Shimano 7900 or Megaexo?

I tried testing by put the axle in the BB. Unfortunately, it was extremely tight. Then I didn't forced it hardly. But some said I should hammer it. The FSA crank axle will fit tightly when we put it in Shimano BB, but it is compattible.

Is it true???

 

[Argentius]

An FSA crank that is two-piece -- that is, the axle is permanently attached to the spider -- is MegaExo. These can use FSA MegaExo BB's -- the external BB mentioned below -- or any Shimano Hollowtech II (external) one, from Sora to Dura-Ace.

The fit will be a loose press fit -- that means you will need some force to drive it in. Usually I can do so with the flat of my hand, but it may take a rubber mallet.

Some older FSA cranks used "Isis" splined bottom brackets. You can tell if you have this if the bottom bracket is not permanently attached to either crank. They used similar series names for these, like "team issue" and "energy," so it can be a little confusing if you are just reading.