I'm looking to do narrowed axles. Do I buy 4 of the MA004F front Hub Carriers or 4 of the MA004R Rear Hub Carriers?? They look identical, so what's the difference??
The fronts have more castor angle. It makes no difference whether the axles are narrowed so you can just get the regular 2 for the front and two for the rear. Unless you don't want all that angle in the front, then you can just get 4 rears.