There is some damage to the headset bearing races on this bike and so I would like to replace them. The problem is that no one seems to know if it has a JIS or ISO headset. I'm on an extended tour, so taking the headset apart to measure everything would be a pain, plus I would have to buy a dial caliper. Also, how would I determine what "stack height" this bikes headset has?
When I had the headset apart to investigate the looseness in it last week I wrote down and photographed the parts and the numbers on them. It is a 1" by 24 TPI Tange Seiki Levin NL500 threaded headset. There are a couple of Tange NL500 headsets for sale on eBay, but one has a JIS crown race and the other an ISO, so it appears that the NL500 was made in different sizes. I've called Harris cyclery and they don't know what size I should get either.
I'm hoping some forum member has replaced a headset on a vintage Expedition and could let me know what size theirs was. Since this bike was only made for a few years I'm hoping they would all be the same size.