What size bolts for a Klein Navigator?
So I've got my Klein built now and I want to add a rack. I order & receive a nice Tubus, go to put it on, and SURPRISE - the bolts don't fit!
There are tapped ears at the rear dropouts for a rack and a fender. The holes are threaded, but no bolts came with the bike. 5 mm bolts are too large & won't go into the holes. 4 mm bolts are too small and just rattle around in there. SAE bolts seem to be the right size, but the thread is wrong - I get the bolts in about half a turn and the threads bind.
Same situation with the front fork - the fork is tapped (inside and outside the fork blade). The holes are too large for 5 mm bolts, too small for 6 mm, and threaded wrong for SAE.
WHAT KIND OF GOOFY BOLTS DOES THIS KLEIN NEED?
I doubt that they'd have used English threads, so I suspect that it is some alternate SAE threading. The local bike shop didn't have anything to fit, nor did the local hardware store. I could tap the holes for the next size up in metric, but I worry about creating stress cracking in the aluminum. I'd really like to have bolts that fit the original Klein threads.
That's quite an odd problem. I'd think they would be the common M5x.8 size. Is there a thick coat of paint in the threads? Have you tried to gingerly run that size tap through yet?
5mm and 6mm taps are DEFINITELY too large for the holes - it isn't just a paint problem.
Originally Posted by Svr