Originally Posted by
HillRider
If you can, mount the rack's leg to the inside (against the dropout face) of the fender strut. That puts less bending moment on the bolt from the rack's load.
If the bolt is bending, odds are that the rack supports were mounted outside the fender stays. The fender stays put almost no weight on the bolt but the rack supports put all the weight of the rack plus its load on the bolts. The closer the rack supports are to the bike frame the less the bolts will bend