There is 5 cm between the braze-ons on my bike. The screws are about 2 cm long. I do need an allen wrench with a short end to fit the wrench in. Alternatively, an allen with a bondus bit that can tighten the screw from an angle. I had my frame custom made and ordered the racks with the frame, so the framebuilder set up the braze-ons to fit the rack.
What kind of rack do you have? Tubus makes one (the Fly) that has a single centered strut. Maybe you could run one long screw through both of those eyelets, with spacers to hold the rack strut where you want it.
Last edited by DebW; 07-19-2009 at 10:49 AM.
Oil is good, grease is better.
2007 Peter Mooney w/S&S couplers/Terry Butterfly
1993 Bridgestone MB-3/Avocet O2 Air 40W
1980 Columbus Frame with 1970 Campy parts
1954 Raleigh 3-speed/Brooks B72