GMM

A friend mentioned that he noticed people with big feet tend to run larger saddle setbacks. Haven't confirmed yet, but seems like it could be true, or maybe it depends on their crankarm length.
Any 'big feet rider', or, 'fitter' opinions?

10 Wheels

Not true says a size 14 rider.

Rimmer

I would guess femur length would affect fore-aft position more than feet. If the balls of your feet are over the pedal axles, then feet length should barely make any difference. I've never seen a fitting calculator ask for my foot size.

adriano 

its true, but its a very small difference.

ColinL

size 12, zero setback seatpost, saddle in the middle of the rails.

not true for me. btw cleats are as far back as possible.

adriano 

farther back cleats will reduce your setback.

ColinL

also reduces torque on your planter fascia which is why I do it.

carlosflanders

Big feet riders tend to run cleats further back a little. That will tend to decrease setback. Femur length has the big effect on setback.

mikerhymeswith

seatpost angle affects setback as well; most production road bikes seem to fall in the 73-74 deg. range; one degree significance increases as seat height increases; body position and cadence most used seem to factor in as well, for example, my TT bike feels correct with the seat pushed forward and it has a 75 deg seatpost, while my cross bike has seat pushed all the way back in a 25mm SB seatpost; 175mm cranks used on both; agree with comments about the femur being a determining factor; large feet could be a factor but as mentioned above, the cleat position is the important thing; if the goal is to get knee-over-spindle (KoS) then you'll find arguments for and against this rule; my technique is to adjust using guidelines, then adjust and ride hard for over an hour to see if there's discomfort; a power meter really helps too in finding your optimal comfort/power/position combination