Headsets & Stack Heights - Colnago Master
10-07-15 | 01:44 PM
#1
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Headsets & Stack Heights - Colnago Master
Trying to figure out which headset to get for my late 80's (I believe) Colnago Master:
I've been doing some searches and found an old post - see response #7 :
https://www.bikeforums.net/classic-vi...dset-type.html
Now I'm worried about stack height. Here's what I was originally considering:
wiggle.com | Campagnolo Record HeadSet 1 Threaded | Headsets
I'm assuming this will be fine, but was hoping someone on here could give me a little reassurance.
I've been doing some searches and found an old post - see response #7 :
https://www.bikeforums.net/classic-vi...dset-type.html
Now I'm worried about stack height. Here's what I was originally considering:
wiggle.com | Campagnolo Record HeadSet 1 Threaded | Headsets
I'm assuming this will be fine, but was hoping someone on here could give me a little reassurance.
10-07-15 | 02:05 PM
#2
Senior Member
Joined: Jun 2005
Posts: 1,899
Likes: 933
From: In transit
Bikes: 07 Vanilla, 98 IRD road frame built up with 25th Ann DA, Surly cross check with 105 comp, 78 Raleigh Comp GS, 85 Centurionelli
Slebo,
Stack heights are very specific to whatever the owner before you cut the steerer tube to. From the pic there isn't a lot of excess tube and you won't likely have much room to play with. What you can do to assess prior to installation is measure how much steerer tube you have, then look up the stack height for the given model headset and see if you have enough tube for it. Your part lists a stack height of 36.5mm, so you just need that much free steerer tube above the frame. Hard to tell without measuring, but it looks like you've got enough, and may even need a spacer or two.
Stack heights are very specific to whatever the owner before you cut the steerer tube to. From the pic there isn't a lot of excess tube and you won't likely have much room to play with. What you can do to assess prior to installation is measure how much steerer tube you have, then look up the stack height for the given model headset and see if you have enough tube for it. Your part lists a stack height of 36.5mm, so you just need that much free steerer tube above the frame. Hard to tell without measuring, but it looks like you've got enough, and may even need a spacer or two.
10-07-15 | 02:09 PM
#3
Thread Starter
Senior Member
Joined: Jul 2014
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Slebo,
Stack heights are very specific to whatever the owner before you cut the steerer tube to. From the pic there isn't a lot of excess tube and you won't likely have much room to play with. What you can do to assess prior to installation is measure how much steerer tube you have, then look up the stack height for the given model headset and see if you have enough tube for it. Your part lists a stack height of 36.5mm, so you just need that much free steerer tube above the frame. Hard to tell without measuring, but it looks like you've got enough, and may even need a spacer or two.
Stack heights are very specific to whatever the owner before you cut the steerer tube to. From the pic there isn't a lot of excess tube and you won't likely have much room to play with. What you can do to assess prior to installation is measure how much steerer tube you have, then look up the stack height for the given model headset and see if you have enough tube for it. Your part lists a stack height of 36.5mm, so you just need that much free steerer tube above the frame. Hard to tell without measuring, but it looks like you've got enough, and may even need a spacer or two.
10-07-15 | 02:20 PM
#4
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Joined: Jun 2005
Posts: 1,899
Likes: 933
From: In transit
Bikes: 07 Vanilla, 98 IRD road frame built up with 25th Ann DA, Surly cross check with 105 comp, 78 Raleigh Comp GS, 85 Centurionelli
Yes, stack height includes the entire height of the headset, including the bottom race and cup. Just make sure the crown race (top of fork at base of tube) surface is against the bottom of the frame's tube and not inside (if you let it go inside this will give you a greater measurement that is not true). There's your stack height, you want the number you measure to be equal or a bit longer than 36.5 mm.
Ignore the google images that show a diagram of "stack height" including the entire steerer tube, those are clearly not correct.
Ignore the google images that show a diagram of "stack height" including the entire steerer tube, those are clearly not correct.
10-07-15 | 02:23 PM
#5
Thread Starter
Senior Member
Joined: Jul 2014
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Yes, stack height includes the entire height of the headset, including the bottom race and cup. Just make sure the crown race (top of fork at base of tube) surface is against the bottom of the frame's tube and not inside (if you let it go inside this will give you a greater measurement that is not true). There's your stack height, you want the number you measure to be equal or a bit longer than 36.5 mm.
Ignore the google images that show a diagram of "stack height" including the entire steerer tube, those are clearly not correct.
Ignore the google images that show a diagram of "stack height" including the entire steerer tube, those are clearly not correct.
10-07-15 | 02:28 PM
#6
Senior Member
Joined: Jun 2005
Posts: 1,899
Likes: 933
From: In transit
Bikes: 07 Vanilla, 98 IRD road frame built up with 25th Ann DA, Surly cross check with 105 comp, 78 Raleigh Comp GS, 85 Centurionelli
Happy to assist, and can't wait to see build pics of this gorgeous frame. Please take the time during the build process to document this with pictures, it's a great way to share your bike with the forum.
