46t for 105 11 speed crank

I've got 105 5800 11 sp 50-34 double. Would like to change out big ring for 46. Can't find a 105 level 46t but it's available in Ultegra for $120! Any other options out there?

The outer rings on the Shimano crankset are always way more expensive than the inners.  Often you can get a complete crankset, including bottom bracket, for not much more than the outer ring.  Especially so from some of the UK vendors.  I'm pretty sure you can get a 5800 crankset for less than $120.  So buy a 46/36 and then switch out the 36 for the 34 from your current crankset.  Well, it looks like I may have to take that back.  The 105 crankset is much less than $120 but it looks as though it may not come in a 46/36.

Another option then would be to get the Ultegra 46/36 crankset and switch out the 36 for a 34.  I've seen them in the $140 to $150 range.  And they are lighter than the 5800 and I'm sure stronger.  Or you could buy a 34 for it and keep the your current crankset whole in case you want to go back to the 50/34 - perhaps for group rides, flat rides, etc.

That said, going from a 50 to a 46 in front doesn't have a huge impact on gearing.  It's about equal to 1 1/2 teeth in back.  Of course, it may be helpful in the middle part of the cassette.

Good luck.

Specialties TA does the X110 series chainring. Pricey, but cheaper than the Shimano rings. Lot more tooth options.

I have a set of CX70 46/36 cranks on my Grade.  They are presumably Ultegra level and shift oh so smoothly and just as fine as the 5800 crankset that I have on one of my road bikes.  Both are amongst the best front shifting that I've experienced. 

Henry


 

I did exactly what DrSpoke mentioned when I built up my FCX frame last month.  After looking at the prices, I got an Ultegra 46/36 and a separate Ultegra 34 ring and swapped it in.  Shifts just fine.