2X chainring change for Rbike

[Marcela]

Have a regular bike with the 2x front chain ring, FSA 110 abs 48/32 with the 4 bolts. I'd like to change the 48 to something like a 38 or 40. I don't see a way to do that at the moment, even dropping the inner chainring a little and changing them both out.

Figured someone here with all the experience would have some ideas.

 

[Chrstn]

If it’s the FSA 110 BCD setup, the main limitation is the bolt-circle diameter. A 38T or 40T outer ring may not be available for that BCD, depending on the exact crank model.
You may be better off changing the entire crankset to one with a smaller BCD, or looking at a compatible compact/sub-compact setup that gives you the gearing you want. I’d check the exact FSA crank model and BCD first, because “110 ABS” can refer to a specific mounting standard.
If you post a photo of the crank and chainrings or the exact model number, someone may be able to point you toward a compatible 38/40T option.

 

[Marcela]

I think what I am gonna have to do is use a 3x crank like fsa makes for the trike with 30/39/52 and disregard the outer chainring and remove it if possible. It just so happens utah trike has them as like new removed parts from their ebike conversions for $85. That is a no brainer right there. Cranks are 10mm shorter than on the Sequoia but no biggy. These would make great gearing for a touring bike. Hope they work out

 

[Marcela]

Got the FSA 3x crank assy in as removed from a Catrike from utah trikes. Removed the big chainring and guard because of interference with the derailleur, installed perfectly in the bb, adjusted the derailleur, and good to go! With the 11-36 cassette the 30/39 chainring is perfect, lost two teeth on the small ring which is good, been a few times wish I had a lower gear count, and the skip to the 39 ring works much better than the previous 48, and the chain line is better also cause the rings are moved inboard a little. And didn't notice the 10mm shorter cranks. Win win situation there.

 

[Chrstn]

That’s a great result! Sounds like you found the perfect solution without having to replace the entire setup. The improved chainline and lower gearing should make a real difference on those longer touring rides, especially when climbing or carrying extra weight. And saving money on a like-new crankset makes it even better. Definitely a win-win! Enjoy the new setup, and thanks for sharing how it worked out.