Headset minimum stack height
05-02-21, 10:42 AM
#1
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Headset minimum stack height
How minimum is the minimum stack height on a 1'' threaded headset?
I've got a '93 Specialized Rockhopper with steerer tube @ 120.9mm and head tube @ 86.4mm, so 120.9 - 86.4 = 34.5mm.
I've got an option with a Tange Seiki Levin JIS headset, which apparently has a 33.3mm stack height.
...but would bad things happen stretching the definition of minimum to another option with a 37.6mm stack height?
All advice gratefully received. Thanks in advance.
I've got a '93 Specialized Rockhopper with steerer tube @ 120.9mm and head tube @ 86.4mm, so 120.9 - 86.4 = 34.5mm.
I've got an option with a Tange Seiki Levin JIS headset, which apparently has a 33.3mm stack height.
...but would bad things happen stretching the definition of minimum to another option with a 37.6mm stack height?
All advice gratefully received. Thanks in advance.
05-02-21, 11:38 AM
#3
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alcjphil is absolutely right. An easy way to see this is to loosen and remove just the top locknut and measure how much thread is visible. Now take away 4mm of that thread.
The one caveat has to do with the number and thickness of the spacer(s)/washer(s). If someone added additional spacers/washers to your existing headset, you have to take that into account.
John
The one caveat has to do with the number and thickness of the spacer(s)/washer(s). If someone added additional spacers/washers to your existing headset, you have to take that into account.
John
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05-02-21, 01:04 PM
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Tange MA-60 is just a tad under 32mm stack:
Source: Barnett Manual
Source: Barnett Manual
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05-02-21, 02:37 PM
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05-03-21, 05:25 AM
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05-04-21, 12:44 AM
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05-04-21, 05:24 AM
#8
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Tange-Seiki have both a "Levin" and a "Levin CDS".
The Levin CDS - the one to which I think you are referring - is pretty useful as a replacement for some mountain bikes and hybrids of that vintage.
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05-04-21, 09:23 AM
#9
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I'll add here that not too long ago, I replaced the original headset on my 1995 Trek 730 Multitrack.
The original was a Tange-Seiki Passage, which has an even smaller stack height than the Levin CDS. The original setup had one extra washer in the stack, though, and leaving that out was enough to get the Levin CDS to work.
I'll have to wait to see how it holds up over the long run, but my impression of the Levin CDS was very positive. Felt like quality stuff; looks great on the bike; reasonably priced.
The original was a Tange-Seiki Passage, which has an even smaller stack height than the Levin CDS. The original setup had one extra washer in the stack, though, and leaving that out was enough to get the Levin CDS to work.
I'll have to wait to see how it holds up over the long run, but my impression of the Levin CDS was very positive. Felt like quality stuff; looks great on the bike; reasonably priced.
05-05-21, 06:09 AM
#10
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I'll add here that not too long ago, I replaced the original headset on my 1995 Trek 730 Multitrack.
The original was a Tange-Seiki Passage, which has an even smaller stack height than the Levin CDS. The original setup had one extra washer in the stack, though, and leaving that out was enough to get the Levin CDS to work.
I'll have to wait to see how it holds up over the long run, but my impression of the Levin CDS was very positive. Felt like quality stuff; looks great on the bike; reasonably priced.
The original was a Tange-Seiki Passage, which has an even smaller stack height than the Levin CDS. The original setup had one extra washer in the stack, though, and leaving that out was enough to get the Levin CDS to work.
I'll have to wait to see how it holds up over the long run, but my impression of the Levin CDS was very positive. Felt like quality stuff; looks great on the bike; reasonably priced.
