After repeatedly trying to squish the races into my steerer tube and failing miserably I read Sheldon's headset page again and measured my old races. Sure enough they were 30.0 and my head tube was 29.9. The 27.0 version will not work on a JIS bike ( except for the fork race which fits fine) . These bearings seemed to fit into my old headset just fine, and the new top threaded nut made my old headset look a bit better.
great headset for the money. it looks great, its sturdy and it was easy to install. i did need to get a spacer to make it work, but that was more an issue with my fork. although its pretty sturdy and runs smoothly, i wouldnt use it for anything you plan on riding really hard. fixies, and townies is what this headset was made for.
Restoring this bicycle has been a long process. This Headset was so hard to find. I still have much more to do in this restoration. Everything in the stores are different tech' or wrong size. That's why I chose JensonUSA. Don't forget the Grease/Lube for the Ball Bearings.
Used this on a road bike build. Great fit and finish. The races that go into the frame are also nice metal not chromed cheap stuff you see on a lot of cheaper headsets. If you are looking for unsealed go for this.
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Plugs are top assemblies for carbon steerers. Replaces the traditional top cap assembly. Includes cap, bolt, and expander. For 1" threadless forks only (will NOT work with 1 1/8" forks)