Hi, I've gathered thus far that while the '08 Kapu takes a 1" threadless headset, it's not a standard ISO 1" size but rather a JIS (Japan Industrial Standard) 1" size. However, I'm having a lot of trouble locating a specific model of threadless headset that comes in 1" JIS instead of ISO. Apparently when Kona chose the FSA Orbit X, they must have specced some kind of custom version of it, because I've read that the commercially available FSA Orbit X is an ISO 1" and won't fit the crown of an '08 Kapu without reaming.

Could someone suggest a specific make and model of headset to me, ideally with a retailler who carries it currently? Thanks so much.

This question came up a few years ago https://www.bikeforums.net/archive/in.../t-218054.html
and https://www.bikeforums.net/archive/in.../t-221412.html

At the time, Nashbar had a 1" JIS threadless headset (Aheadset I think) but it looks like they no longer do. Can you can mill your fork down and ream your head tube out for an ISO headset?

EDIT: Another possibility would be to install a 1" JIS threaded headset. Skip the keyed spacer and lock nut and just put on the threadless stem and top cap. You can probably pick up a 1" top cap at any bike shop if you don't already have one. You may need to ream out the threads on the top cup.

I think that exceeds my current skillset as a home mechanic. But if I can't find someone who currently carries a JIS threadless, perhaps it'll be the only option. Is a milling/reaming job of this scope something that should be a routine job for any LBS?

Ahhh! I think I heard a choir singing in the background as I found this:

Ritchey Logic 1" Threadless Black/Silver Headset 27.0 crown
$22.99 from www.racepacebicycles.com

Woohoo!!!

https://racepacebicycles.com/page.cfm...ils&sku=HD3224