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Vitus 979 and headset replacement...

Old 05-02-13, 08:57 AM
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Popeyecahn
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Vitus 979 and headset replacement...

Before I get this done, are they any caveats when doing the work with regards to methods and materials? Is it straightforward or ?

The crown race was cracked and while cleaning it one of the bearing cages got wonky, so I figured it would be best just to have the whole thing replaced after 20+ years. Headset is a 105 and I've got an NOS 105 cartridge type to replace.
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Old 05-02-13, 09:48 AM
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Nope, just be sure to put a layer of grease betwixt the cups and frame. Be sure to chexck the head tube for cracks with the old headset cups in place, too.
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Old 05-02-13, 10:49 AM
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Originally Posted by mudboy View Post
Nope, just be sure to put a layer of grease betwixt the cups and frame. Be sure to chexck the head tube for cracks with the old headset cups in place, too.
Thanks will do!
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Old 05-02-13, 10:57 AM
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And make sure the two headsets have the same (or close) stack height. I am not familiar with the cartridge-type 105 headsets, but the early loose bearing-type 105 headsets (HP-1055) have an uncommonly short stack height of 33.5cm. If other headset is more than a few cms taller, you may not have enough threads to fully tighten the top lock nut.
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Old 05-02-13, 12:14 PM
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Originally Posted by gaucho777 View Post
And make sure the two headsets have the same (or close) stack height.
Hmmm good point, looking at them now to determine. The thought crossed my mind but I guess I figured that by going with a similar/same headset I'd be ok...
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Old 05-02-13, 12:28 PM
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There's also the issue of crown race size. See: https://sheldonbrown.com/headsets.html. I'm guessing it's 26.4mm, but you can measure/compare the headsets if you have a set of calipers.
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Old 05-02-13, 02:24 PM
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I'm pretty sure it's 26.4mm but I haven't mic'd it yet to be absolutely sure. I am sure that the 105 headset I bought is too tall (about 4mm according to published data) as it's 37.6mm.

I'm torn between 'giving it a go' or just replacing the crown race only, inspecting the bearings and riding on until I can source a good HP-1050 (the cartridge type I understand to be HP-1055). I've dropped the bearings in an ultrasonic to get a better look. The rest of it seems fine, no brinelling that I can see of feel.

Thanks for the advice, info BF is a cyclist's friend for sure!
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Old 05-02-13, 02:39 PM
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The newere 105 cartridge have a higher stack height...trust me!!!
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Old 05-02-13, 03:05 PM
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Yeah, I think it's a non-starter even at 4mm difference. Though I could use a thinner spacer I suppose...

So this brings me to this question (as a complete novice...) assuming the crown race is 26.4mm, do I need to source a proper Shimano of the era, or will the Tange/CDS/etc work with the remaining Shimano parts?
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Old 05-02-13, 05:03 PM
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Originally Posted by Popeyecahn View Post
Yeah, I think it's a non-starter even at 4mm difference. Though I could use a thinner spacer I suppose...

So this brings me to this question (as a complete novice...) assuming the crown race is 26.4mm, do I need to source a proper Shimano of the era, or will the Tange/CDS/etc work with the remaining Shimano parts?
If it's that tight your better of sourcing the proper Shimano parts....
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Old 05-02-13, 11:48 PM
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After putting it back together and measuring off 4mm, there's not much left for threading on the top cap. The original bearings and races look pretty decent with a good bit of life in them, sourcing out a usable and proper Shimano crown race will prove to be interesting. I could always spring for a Chris King...

I also found some other interesting makes that had 34mm or less stack height. Let the good times roll!
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Old 05-04-13, 07:33 PM
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So today I went through a cache of them at a shop in east San Diego and found a suitable candidate, the guy set it for free and off I went. Now to start putting everything back together, and once the bars and stem arrive I'll be ready to roll!
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