I'm doing up a 2001 Trek 6700 and have all the parts bar the headset and as the one in it was a bodgie job and I'm doing a total replacement.
I've found the original 2001 Trek specs and they state that the headset was a Dia-Compe STR, 1 1/8" Sealed, and in a 2002 spec sheet (the frame specs were unchanged so I'm assuming all else was pretty much the same) with specs 25.4/34.0/30.0, Stack height 23.0mm.
What do I need to get? I've knocked out both bearing cups and they appear identical and measure around 34mm where they slide into the head tube. The head stem has an OD of 28mm.
Total confusion on replacement headset
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- queequeg
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Re: Total confusion on replacement headset
Postby queequeg » Wed Jul 11, 2018 4:06 pm
Try this little helper:- https://blue.canecreek.com/headset-fit-finderseptuagenarian wrote:I'm doing up a 2001 Trek 6700 and have all the parts bar the headset and as the one in it was a bodgie job and I'm doing a total replacement.
I've found the original 2001 Trek specs and they state that the headset was a Dia-Compe STR, 1 1/8" Sealed, and in a 2002 spec sheet (the frame specs were unchanged so I'm assuming all else was pretty much the same) with specs 25.4/34.0/30.0, Stack height 23.0mm.
What do I need to get? I've knocked out both bearing cups and they appear identical and measure around 34mm where they slide into the head tube. The head stem has an OD of 28mm.
'11 Lynskey Cooper CX, '00 Hillbrick Steel Racing (Total Rebuild '10), '16 Cervelo R5, '18 Mason BokekTi
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Re: Total confusion on replacement headset
Postby septuagenarian » Wed Jul 11, 2018 4:13 pm
Cheers queequeg
The Murphy factor has kicked in as I've already tried that tool with no joy.
The Murphy factor has kicked in as I've already tried that tool with no joy.
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Re: Total confusion on replacement headset
Postby septuagenarian » Wed Jul 11, 2018 4:15 pm
I believe Dia-Compe were acquired by Cane Creek so perhaps I should ask them.
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Re: Total confusion on replacement headset
Postby queequeg » Wed Jul 11, 2018 4:22 pm
Did you go through the "I don't know my bike". It shows you how to measure your existing headset and bike and tell you what you needseptuagenarian wrote:Cheers queequeg
The Murphy factor has kicked in as I've already tried that tool with no joy.
'11 Lynskey Cooper CX, '00 Hillbrick Steel Racing (Total Rebuild '10), '16 Cervelo R5, '18 Mason BokekTi
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Re: Total confusion on replacement headset
Postby septuagenarian » Wed Jul 11, 2018 4:51 pm
0queequeg wrote:Did you go through the "I don't know my bike". It shows you how to measure your existing headset and bike and tell you what you needseptuagenarian wrote:Cheers queequeg
The Murphy factor has kicked in as I've already tried that tool with no joy.
Thanks, I've just sent that off.
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Re: Total confusion on replacement headset
Postby septuagenarian » Wed Jul 11, 2018 7:36 pm
Already had a reply from Cane Creek and ordered a BrandX unit with sealed bearings. Fingers crossed it fits.septuagenarian wrote:0queequeg wrote:Did you go through the "I don't know my bike". It shows you how to measure your existing headset and bike and tell you what you needseptuagenarian wrote:Cheers queequeg
The Murphy factor has kicked in as I've already tried that tool with no joy.
Thanks, I've just sent that off.
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Re: Total confusion on replacement headset
Postby Duck! » Wed Jul 11, 2018 10:57 pm
I'm suspecting there's a typo there somewhere, because that combination of dimensions doesn't add up. Or the terminology is being misinterpreted...septuagenarian wrote:What do I need to get? I've knocked out both bearing cups and they appear identical and measure around 34mm where they slide into the head tube. The head stem has an OD of 28mm.
Those specs don't align with a 1 1/8" steerer; the first figure, 25.4 shouts out 1" steerer tube. So what you need to determine are: a) the diameter of the steerer tube (the top bit of the fork that goes up through the frame) - it will be either 1" (25.4mm) or 1 1/8" (28.6mm); b) whether the headset is i) an external cup (EC) type, where the cups containing the bearings sit outsside the head tube with a spigot to fit into the frame; ii) a semi-integrated/internal type with the bearing cups located inside the head tube, then the bearings fitted in the cups; iii) an integrated type, with the bearings directly fitted in the frame. Slightly confusingly, both integrated and semi-integrated headsets will be described as "zero stack", meaning the headset assembly doesn't meaningfully exceed the frame's head tube length, although an internal/semi-integrated type will do so by 2-3mm; c) the bore of the head tube - this can be anywhere between 30.something mm for an EC headset to 44mm for a ZS semi-integrated model.I've found the original 2001 Trek specs and they state that the headset was a Dia-Compe STR, 1 1/8" Sealed, and in a 2002 spec sheet (the frame specs were unchanged so I'm assuming all else was pretty much the same) with specs 25.4/34.0/30.0, Stack height 23.0mm
I had a thought, but it got run over as it crossed my mind.
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Re: Total confusion on replacement headset
Postby septuagenarian » Wed Jul 11, 2018 11:51 pm
The 25.4 reference confused me too (it doesn't take much) but the steerer tube OD is def 28.6mm so go figure.
The headset I've ordered is an EC type and the specs match those Cane Creek sent me, ie EC 34.00/28.6 and EC 34.00/30.00 and the ID of my head tube is 34mm and the OD of the head stem is 28.6mm
The headset I've ordered is an EC type and the specs match those Cane Creek sent me, ie EC 34.00/28.6 and EC 34.00/30.00 and the ID of my head tube is 34mm and the OD of the head stem is 28.6mm
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