any that have seen my various other threads will know that I recently got a cheap single speed off the Bay…
old skool 27" 10 speed turned into a single speed running 52/17
there are a couple of things that I am planning on doing to it…
new wheels… or at least rear flip flop hub… really want to try fixed
new bars… moustache maybe
now the reason for this thread…
headset… has at the moment an old rusting chromed 1" threaded (so I was told by a Cameron (?) at Corsa)
I know nothing of threaded headsets… been using threadless on mtb’s for ages
if I find one that is listed on the Bay as being 1" threaded… what diff should it matter to me if it is English threaded or whatever ??? does the fork stem (?) thread into it at all or what ??? etc etc etc
have not been able to come across any decent visual breakdown of the makeup of the threaded headset and what one needs to do and take into account when replacing just the headset
^ I’m not so convinced about that interchangeability quote because the JIS cup outside diameter is .2mm less. That is insufficient for an interference fit - IME you can push it in with your hand and there is almost no resistance - the cup falls out if bumped. On ‘older or lower quality frames’ they probably had thicker steel head tubes requiring a smaller cup OD. They all fit the same fork though, but not the same fork crown.
reviving this thread cos i just had my own interchangeability issue regarding using a JIS headset instead of ISO and thought i’d save others from the extra time/worry working it out.
sanesteban is right, the JIS cups just fall out and the crown race doesnt fit as snug, but once everything is tightened it seems to work with no play between the fork and frame.
so my conclusion is that yes JIS can be used in place of ISO, the .2mm difference isn’t enough to be a problem. Not sure about the other way around, i can’t imagine squezzing ISO cups into a JIS headtube is healthy.
hopefully i don’t end up eating my words and smashing my teeth in the next few months of riding
Slightly off-topic… I don’t know if this has just been my experience… but any ‘LBS’ in Adelaide NEVER have anything to do with old bikes. Source your own parts. And just get the right size
The older guy at Star is usually the best to talk to about their mythical cave of goodness, he is however reluctant to sell NOS track frames (I think they were branded “Vortex” back in the day) unless you race, hence my fat arse couldn’t nab one. He did offer me a NOS road frame/fork for $80. Might consider for my next build. I saw a complete NOS Shimano 600 groupset out there but it wasn’t for sale