1″ to 1 1/8″ headset. Is it possible?
08-30-20, 04:02 AM
#2
Junior Member
Quick answer: no.
Long answer: a frame builder might do it for you, for probably a unworthy price tag. Probably cheaper to get a new frame or, maybe, look from the other way around and buy a custom front fork with matching specifications from the same frame builder.
Bottom line: if everything is OK and you like your bike, just accept it as it is and live with it, there’s nothing wrong with that.
Long answer: a frame builder might do it for you, for probably a unworthy price tag. Probably cheaper to get a new frame or, maybe, look from the other way around and buy a custom front fork with matching specifications from the same frame builder.
Bottom line: if everything is OK and you like your bike, just accept it as it is and live with it, there’s nothing wrong with that.
08-30-20, 05:22 AM
#3
Member
Thread Starter
Quick answer: no.
Long answer: a frame builder might do it for you, for probably a unworthy price tag. Probably cheaper to get a new frame or, maybe, look from the other way around and buy a custom front fork with matching specifications from the same frame builder.
Bottom line: if everything is OK and you like your bike, just accept it as it is and live with it, there’s nothing wrong with that.
Long answer: a frame builder might do it for you, for probably a unworthy price tag. Probably cheaper to get a new frame or, maybe, look from the other way around and buy a custom front fork with matching specifications from the same frame builder.
Bottom line: if everything is OK and you like your bike, just accept it as it is and live with it, there’s nothing wrong with that.
08-30-20, 06:35 AM
#4
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The bike guy video I've seen uses an adapter. Is there a different one?
I don't see any disadvantage to using an adapter: you can use all the modern stems, and you still have the height adjustment that a quill affords—kind of best of both worlds. What's not to like?
I don't see any disadvantage to using an adapter: you can use all the modern stems, and you still have the height adjustment that a quill affords—kind of best of both worlds. What's not to like?
08-30-20, 07:03 AM
#5
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Edit: I found what I believe is his video and he specifically says: "A fork with a 1-1/8" streerer just won't work in a head tube made for a 1" steerer in most cases." Actually that video shows how he converted from 1" threaded fork/headset to a 1": threadless fork and headset. He did not fit a 1-1/8" anything.
Last edited by HillRider; 08-30-20 at 07:08 AM.
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08-30-20, 07:56 AM
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I use a quill adapter on my vintage steel, and happy with the ability to use modern stems.
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08-30-20, 08:22 AM
#7
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You can purchase a 1 inch threadless fork. To use a 1 1/8" stem you would use a 1' to 1 1/8" spacer. Once it is mounted, it is hidden. Other than that, the quill adapter is the other way.
08-30-20, 08:51 AM
#8
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Thread Starter
Go back to that video and see how he did it. I don't have any idea how you can fit a large steerer without replacing the headtube.
Edit: I found what I believe is his video and he specifically says: "A fork with a 1-1/8" streerer just won't work in a head tube made for a 1" steerer in most cases." Actually that video shows how he converted from 1" threaded fork/headset to a 1": threadless fork and headset. He did not fit a 1-1/8" anything.
Edit: I found what I believe is his video and he specifically says: "A fork with a 1-1/8" streerer just won't work in a head tube made for a 1" steerer in most cases." Actually that video shows how he converted from 1" threaded fork/headset to a 1": threadless fork and headset. He did not fit a 1-1/8" anything.
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08-30-20, 12:36 PM
#9
Banned
Have to replace the frame head tube to take a bigger fork headset ... essentally need a new bike.
Framebuilder-Headset manufacturer Chris King , did at one time show a headtube he machined to look slimmer,
by incorporating the headset bearings into the ends rather than as usual pressing the race assemblies into the standard head tube.
and having a 1.125" fork in it..
Framebuilder-Headset manufacturer Chris King , did at one time show a headtube he machined to look slimmer,
by incorporating the headset bearings into the ends rather than as usual pressing the race assemblies into the standard head tube.
and having a 1.125" fork in it..
08-30-20, 04:03 PM
#10
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Short answer - No
Look at the numbers in the chart in #11 here.
https://www.parktool.com/blog/repair...earing%20seat.
Look at the numbers in the chart in #11 here.
https://www.parktool.com/blog/repair...earing%20seat.
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08-30-20, 04:14 PM
#11
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It can't be converted? I saw a video from RJ The Bike Guy and he convert his vintage road bike from 1″ to 1 1/8″ . Also the reason why I want to convert it because I don't like the old style of the quill stem. Yes, I know I can change the quill stem to a quill to 1 1/8 adapter but, I don't want to.
1 1/8th to 1 1/8th....oh boy...
08-30-20, 07:40 PM
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Is it road or mountain, suspension or rigid?
You still can’t fit a 1-1/8”, just wondering.
Road quill stems including higher rise and short reach are easy to find. Mountain quills may be a bit more limited. Mountain 1” steerer tube forks are tougher to find, especially suspension forks.
John
You still can’t fit a 1-1/8”, just wondering.
Road quill stems including higher rise and short reach are easy to find. Mountain quills may be a bit more limited. Mountain 1” steerer tube forks are tougher to find, especially suspension forks.
John
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08-30-20, 09:00 PM
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We just went through this in the framebuilder forum. The answer is no.
The math just doesn't work on that. A standard head tube for a 1" steerer has a 30mm internal diameter. An 1 1/8" steerer tube is 28.6mm, which leaves a difference of 1.4mm. Divide that 1.4mm by 2 and you get .7mm of clearance between the steerer and the head tube. Allowing for a .1mm clearance between the steerer and the headset cup leaves a .6mm wall thickness for the cup. Even with a steel cup, that is not thick enough for safety.
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08-31-20, 02:58 PM
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If the question is can you put a 1.125" headset into a frame meant to take 1", the answer is no.
If the question is can you put a 1" headset into a frame meant to take 1.125" then I suppose there might be an adapter out there.
If the question is can you put a 1" headset into a frame meant to take 1.125" then I suppose there might be an adapter out there.
08-31-20, 03:19 PM
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I have a bike with a 1" threadless headset and carbon fork, and a Ritchey 1" threadless stem. They are out there!
From the late 90s to early 2000s, road bikes were commonly specced with 1" threadless headsets. Before that it was all quills, and after that they went to 1 1/8".
From the late 90s to early 2000s, road bikes were commonly specced with 1" threadless headsets. Before that it was all quills, and after that they went to 1 1/8".
09-01-20, 05:01 PM
#17
Junior Member
Headtube reducer:
https://www.jensonusa.com/Problem-So...adtube-Reducer
Steering tube spacer:
https://www.sjscycles.co.uk/stems/mp...54-mm/?geoc=US
https://www.ebay.com/itm/Steer-Tube-...-/233470928651
09-01-20, 06:58 PM
#18
Full Member
Indeed. I purchased adapters for a 1" headset and steer tube fork into a 1.125" headtube frame, and paid a LBS mechanic for the installation. Frame and fork were early and late 90's respectively, and the installation was successful.
Headtube reducer:
https://www.jensonusa.com/Problem-So...adtube-Reducer
Steering tube spacer:
https://www.sjscycles.co.uk/stems/mp...54-mm/?geoc=US
https://www.ebay.com/itm/Steer-Tube-...-/233470928651
Headtube reducer:
https://www.jensonusa.com/Problem-So...adtube-Reducer
Steering tube spacer:
https://www.sjscycles.co.uk/stems/mp...54-mm/?geoc=US
https://www.ebay.com/itm/Steer-Tube-...-/233470928651
09-02-20, 05:54 AM
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I have a bike with a 1" threadless headset and carbon fork, and a Ritchey 1" threadless stem. They are out there!
From the late 90s to early 2000s, road bikes were commonly specced with 1" threadless headsets. Before that it was all quills, and after that they went to 1 1/8".
From the late 90s to early 2000s, road bikes were commonly specced with 1" threadless headsets. Before that it was all quills, and after that they went to 1 1/8".
John
09-02-20, 07:48 AM
#20
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I just discovered this thing: https://www.bikeforums.net/classic-v...n-headset.html it does not quite adapt a frame with a smaller head tube to accept a fork that can't realistically fit in it, but it does a much better job of making a clean conversion to a modern threadless fork.
the bike in this video uses it
the bike in this video uses it
Last edited by mack_turtle; 09-16-20 at 07:49 AM.
09-02-20, 07:55 AM
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I build road frames with 1" steerers and see nothing wrong with it. 1" quill has a few downsides, but they really aren't significant. I use quill adapters on all of my bikes with threaded 1" steerers, and shims with the threadless ones.
09-03-20, 11:12 AM
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If the OP is curious, the dimensions here should clarify. The OD of a 1-1/8 steer time is bigger than the ID of the head tube. You'd have to remove the headtube on the frame to replace it.
09-16-20, 12:17 AM
#24
Senior Member
This might not sound like good advice, but here is how I converted my 1" Mondonico to 1 1/8".
1. I loaded my bike on my roof rack, it had 1" head tube at this time
2. drove it into the garage (you saw this coming, I assume)
3. framebuilder replaced head tube and top tube, using 1 1/8"
voila...now you could skip the part about driving it into the garage
honestly though, just get a bike with a 1.125" head tube if you don't wanna run 1"
1. I loaded my bike on my roof rack, it had 1" head tube at this time
2. drove it into the garage (you saw this coming, I assume)
3. framebuilder replaced head tube and top tube, using 1 1/8"
voila...now you could skip the part about driving it into the garage
honestly though, just get a bike with a 1.125" head tube if you don't wanna run 1"