Crankset swap question

[rivers]

I have an FSA Omega MegaEXO crankset (https://shop.fullspeedahead.com/en/cranksets/road/omega-crankset) that I want to swap onto my new bike. The new bike is currently equipped with a Shimano 105 compact crankset. It has a BB86 bottom bracket. The shimano spindle width is 24mm and the FSA 19mm. Is it possible to do a straight swap or do I need to swap out the bottom bracket as well?

Reason for the swap is I want better gearing for gravel and bikepacking. The FSA is 46/30 subcompact.

 

[Deleted member 1258]

Can you just change the chainrings on the new bike?

 

[rivers]

Can you just change the chainrings on the new bike?

No, the shimano crankset can only go down to a 50/34. I already have the 46/30 salvaged from a recovered (but trashed) stolen bike.

 

[Deleted member 1258]

No, the shimano crankset can only go down to a 50/34. I already have the 46/30 salvaged from a recovered (but trashed) stolen bike.

Whats the BCD on the Shimano crankset?

 

[GuyBoden]

Use the FSA crankset and the FSA BB.

The BB needs to match the axle/spindle diameter.

 

[rivers]

Whats the BCD on the Shimano crankset?

110 bcd

 

[rivers]

Use the FSA crankset and the FSA BB.

The BB needs to match the axle/spindle diameter.

cool that's what I needed to know

 

[Deleted member 1258]

110 bcd

It will take a 46 tooth ring, and I suspect it will take a 30 tooth ring as well, I haven't tried to put a 30 ring on mine, my East way is 10 speed Tiagra, it came with 50/34, it now wears 48/38, and I've had a 46 on it in the past.

 

[rivers]

It will take a 46 tooth ring, and I suspect it will take a 30 tooth ring as well, I haven't tried to put a 30 ring on mine, my East way is 10 speed Tiagra, it came with 50/34, it now wears 48/38, and I've had a 46 on it in the past.

33T is the minimum for Shimano hollowtech cranksets. I already have a 46/30 crankset, which from the sounds of it either needs spindle adapters or a new bottom bracket, which is vastly cheaper than buying new chainrings (as the chainrings on the 46/30 are 120 bcd).

 

[Sharky]

Have you explored the cassette options?

 

[si_c]

You need one of these if it's a press-fit BB86, the Shimano BB won't work sadly as there are two versions of Mega Exo -19mm and 24mm.