Originally Posted by AnthonyG

OK, your a long legged guy so ANY standard crank length is reasonable for you. I just didn't want to reccomend a crank length of say 170mm and find that you have only a 28" inseam in which case it would still be FAR too long. I recommend cranks to be from 19% to 20.5% of inseam. Now for your inseam, 175mm is still in my recommended range but that doesn't mean that you should stick with them. Everyone is different and my recommendation is based on a range to cover many factors and preferences.

Anyway you probably couldn't go wrong with many lengths but try some 170mm cranks in order to increase the difference. The 105 cranks should work fine. You just have to put them on and see how they work. You will then be able to find out for yourself how the length is and if you like the length but the chainline is wrong you can then get another BB with a shorter spindle.

Another thing I always recommend is that when you go to shorter cranks you usually need to move the saddle rearwards as well as up to compensate. This is assuming that you were positioned near KOPS (knee over pedal spindle) in the first place.

Anthony