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1986 Trek 500 headset question

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1986 Trek 500 headset question

Old 03-18-18, 05:04 PM
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Pars 
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1986 Trek 500 headset question

I went to change the headset out on my 1986 Trek 500 and had a question as to whether Trek was ISO or JIS? I was assuming ISO. The fork crown seat measured 26.45mm, so ISO for that. The cups seemed very tight however. The headtube measured slightly under 30mm (or right at it). The headset I had gotten for this was a Tange Levin with 30.2mm cups/26.4mm crown race. Just want to make sure I didn't screw up by pressing the cups in (homemade press with thick washers/threaded rod).

Original headset was supposed to be a Hatta Vespa (?). Short stack height, hence the Tange. The headset that was in it was something my brother cobbled together with Campy lower end and Shimano upper end. From what I could tell, the upper cup was JIS, the lower probably ISO 30.2mm. Crown race was 26.4.
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Old 03-20-18, 02:20 PM
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No one has any input on whether this Trek would be ISO or JIS?
ISO seemed to fit fine, but the cups were more difficult than I am used to to press in with a homemade press. Crown is definitely ISO, unless my brother had it machined.
Just concerned that I could split a lug...
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Old 03-20-18, 02:51 PM
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http://lmgtfy.com/?q=headset+trek+500

Oh, look! March 3rd, 2014 a headset question about a 1986 Trek 500! It's by some bikeforums user named Pars? Weird.

A headset is $40 The bike shop has one. My guess is it's a standard 1 inch threaded. If the top nut threads on easily with fingers, you've got the right one.
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Old 03-20-18, 03:56 PM
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Originally Posted by base2 View Post
http://lmgtfy.com/?q=headset+trek+500

Oh, look! March 3rd, 2014 a headset question about a 1986 Trek 500! It's by some bikeforums user named Pars? Weird.

A headset is $40 The bike shop has one. My guess is it's a standard 1 inch threaded. If the top nut threads on easily with fingers, you've got the right one.
That's weird.
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Old 03-20-18, 08:00 PM
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Originally Posted by base2 View Post
http://lmgtfy.com/?q=headset+trek+500

Oh, look! March 3rd, 2014 a headset question about a 1986 Trek 500! It's by some bikeforums user named Pars? Weird.

A headset is $40 The bike shop has one. My guess is it's a standard 1 inch threaded. If the top nut threads on easily with fingers, you've got the right one.
Well whaddayaknow, you're right! I did ask about this kind of 4 years ago. Doesn't look like I asked anything about ISO/JIS then however.

I bought a Tange Levin CDS last year, in ISO, and installed it this past weekend, but wanted to check on the cup size. Thanks for pointing that out to me however, as I missed it while doing a search here before I posted.
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Old 03-21-18, 06:56 AM
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The Trek would have left the factory machined to take an ISO headset. Perhaps this frame was machined with a worn cutter, or the replacement headset is slightly oversize? In any case, it wouldn't be hard to re-machine the head tube to proper spec.
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Old 03-21-18, 08:09 PM
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Thanks John! I may have a shop reface and check that. Headset is a standard Tange Levin CDS, 30.2/26.4. The frame was repainted before my brother got it, maybe there is some paint on the inside of the headtube lips.
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