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Discussion Starter · #1 ·
My wife has a bike with a 50/34T FSA 110mm BCD. I just looked up the Specialized 2016 version of her bike, and they have replaced the crank with a "sub-compact" described thusly:

FSA Gossamer Pro, alloy, MegaEVO BB, sub compact, 48/32T, 110mm BCD spider
I can't find this anywhere on the FSA website, and had thought 33T was a lower bound.

She is having back issues on steep climbs, so if I could switch the inner ring, or even put in a new crank, it might help her out a bit.
 

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I'm not familiar with the BB terms being used here (MegaEVO, MegaEXO, BB386EVO, etc..)

Both the Pro and the Light BB386 some in 'smaller than compact' versions. Would one of these work?

FSA Gossamer Pro ABS BB386EVO - FSA
SPECS


  • — Length - L165mm, L170mm, L172.5mm, L175mm
  • — Q-Factor - 145mm
  • — BCD-110mmABS
  • — Chainline - 44mm
  • — 53/39T, 52/38T, 52/36T, 50/34T, 46/36T
  • — 751g

FSA SL-K LIGHT BB386EVO DB - FSA
SPECS


  • — Length - L165mm, L170mm, L172.5mm, L175mm
  • — BCD - 110mm
  • — 53/39T, 52/36T, 50/34T, 46/36T
  • — 619 grams

Or is it possible there is a typo and they meant MegaEXO instead? That one matches your description
FSA Omega MegaExo - Full Speed Ahead
SPECS


  • — Length - L165mm, L170mm, L172.5mm, L175m
  • — BCD - 110mm
  • — Chainline - 44mm
  • — Q-factor - 146mm
  • — 50/34T, 52/36T, 48/32T, 46/36T, 46/30T
  • — 925 grams (Megaexo version)
 

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I'm calling typo.
 

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Discussion Starter · #4 · (Edited)
I'm not familiar with the BB terms being used here (MegaEVO, MegaEXO, BB386EVO, etc..)

Both the Pro and the Light BB386 some in 'smaller than compact' versions. Would one of these work?



Or is it possible there is a typo and they meant MegaEXO instead? That one matches your description
FSA Omega MegaExo - Full Speed Ahead
SPECS


  • — Length - L165mm, L170mm, L172.5mm, L175m
  • — BCD - 110mm
  • — Chainline - 44mm
  • — Q-factor - 146mm
  • — 50/34T, 52/36T, 48/32T, 46/36T, 46/30T
  • — 925 grams (Megaexo version)
I missed that, but I can't blame it on the typo.

Anyway, many thanks.

(If I have to get the whole crank, I might get her a 46/30T; this would be ideal, since the only other one I found is one which requires a square taper bb.)
 

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I missed that, but I can't blame it on the typo.

Anyway, many thanks.

(If I have to get the whole crank, I might get her a 46/30T; this would be ideal, since the only other one I found is one which requires a square taper bb.)
Wow! I didn't know they made 48/32T or 46/30T. I've seen the FSA Afterburner in 42/28T, 40/28T and 39/27T.

Getting just a lower low ring would not be a good idea. A 50/34T is already a 16 tooth jump. You wouldn't want to have a jump any greater than this.
 

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A few years ago they had a solution for this problem, it's called a triple crankset.
Well yes, very true. Unfortunately, if he wants to go that way, he will need a new left shifter.
 

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Discussion Starter · #8 ·
A few years ago they had a solution for this problem, it's called a triple crankset.
I agree, and there is a Crampy Athena triple I am seriously considering for my Bianchi. (The only thing holding me back is I just purchased a $200 46/30T IRD crank for it. Had I known I could get the Crampy for only $75 more, I probably would have.)

The problem is the index shifters. Frankly, her bike really isn't worth it, and I doubt she would ever visit the large chain-ring. (My Bianchi has friction shifters on the down tube.)

This one has the merit of being a drop-in replacement for what she has (and the 48/32T version is used on this year's version of her bike).
 

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Discussion Starter · #9 ·
Well yes, very true. Unfortunately, if he wants to go that way, he will need a new left shifter.
This is a hybrid-ish bike with a mtn shifter, so I wonder if there is a way to set it to use 3 positions?

Edit: Nope. Says "Tiagra Double". Since she would be unlikely to use the large ring, a 46/30T would probably be the most straightforward thing. It would also only cost her one gear at the top end (50/12 = 46/11).
 

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Discussion Starter · #11 ·
Triples have crappy Q-factors. :(
I can't speak for her, but I could actually use a little more Q-factor. My right shoe heal has a worn spot where I hit the chain stay.
 

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I can't speak for her, but I could actually use a little more Q-factor. My right shoe heal has a worn spot where I hit the chain stay.
Different folks, different strokes.

But Q-Factor in general has crept up over time... 'back in the day', higher-end doubles were often in the upper 130s. Now it's more like upper 140s or lower 150s. :(

Triples are even wider, of course... I personally can't abide 'em, I'm not built wide enough in stance/hips for 'em.
 

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Discussion Starter · #13 ·
My ultegra 11-sp Q-factor is 147 mm
 

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Since she would be unlikely to use the large ring, a 46/30T would probably be the most straightforward thing. It would also only cost her one gear at the top end (50/12 = 46/11).
This sounds like the best option. Though if she never uses the large ring, why not explore the Afterburner I mentioned with a 42/28T, 40/28T or 39/27T.

Keep in mind that if she does go into the large ring, a smaller large ring may need a different FD for smooth shifting since the arc will be different.
 

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Discussion Starter · #16 ·
Not terrible, but I have a DA 7400 crank with a Q of 138.

It pedals like buttah. :cool:
Well, at least that explains why my chainring melts so easily.


This sounds like the best option. Though if she never uses the large ring, why not explore the Afterburner I mentioned with a 42/28T, 40/28T or 39/27T.
I might well do that, but I meant she never uses 50/11. Also, she is currently running the very same crank in a different chainring size, so the operation would be less painful for the bike.

Keep in mind that if she does go into the large ring, a smaller large ring may need a different FD for smooth shifting since the arc will be different.
I found that out the hard way on my Bianchi.
 
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