Headset/stem question
- Thread starter Macka
- Start date
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accountantpete
OAP
That link doesn't work - try using the chain sybol next to the smilie or the image box next door.
accountantpete
OAP
Ah - with you now Macka.
That is a bung for a carbon steerer with what looks like a top-cap bolt threaded in it.
Simply undo the bolt with a hex key, pop the spacers and stem on and then put the bolt you have removed through a top cap and then thread it back into the hole from whence it came.
If that does the trick - don't tighten anything yet - come back to the forum for directions on how to tighten up!Unless of course you know what you are doing.
That is a bung for a carbon steerer with what looks like a top-cap bolt threaded in it.
Simply undo the bolt with a hex key, pop the spacers and stem on and then put the bolt you have removed through a top cap and then thread it back into the hole from whence it came.
If that does the trick - don't tighten anything yet - come back to the forum for directions on how to tighten up!Unless of course you know what you are doing.
Will give it a go and let you know.
Thanks for that...first time with a carbon steerer!
It is the fact that the protruding part has an outer thread and held with a hex bolt thru the centre.
Do I need to buy a top cap for that then?
How it is shown is how it came...
Thanks again
Steve
accountantpete
OAP
There should have been a top cap - but if you haven't got one then it's a trip down to the LBS to see if they have a spare.
You will need one or two spacers as well by the looks of it - the stem and spacers should be sufficient to cover the exposed bit of the steerer and an extra 1/4"
You will need one or two spacers as well by the looks of it - the stem and spacers should be sufficient to cover the exposed bit of the steerer and an extra 1/4"
Tollers
Guru
- Location
- San Francisco, California
Here's a (bit small) diagram of how it should all work
http://t2.gstatic.co...culi4BSL36g&t=1
and http://www.sheldonbrown.com/images/headset-threadless.jpg
http://t2.gstatic.co...culi4BSL36g&t=1
and http://www.sheldonbrown.com/images/headset-threadless.jpg
Thanks for all the replies...Much appreciated.
I have done a number of the 'normal' mountings but have never seen this before.
The main bolt doesnt go direct down to the star washer but into what you see sticking up from the steerer tube.
This part is threaded on the outside as if something screws over it?? The main hex bolt then its inside this
Any ideas
accountantpete
OAP
If I get this right - the bit sticking up has a thread inside it for the top cap and bolt to screw into.
I don't know the type of bung but some have a 5mm hex slot under the thread for tightening and undoing the bung - try sticking a hex key down there to see if anything engages.
I don't know the type of bung but some have a 5mm hex slot under the thread for tightening and undoing the bung - try sticking a hex key down there to see if anything engages.
accountantpete
OAP
Tollers
Guru
- Location
- San Francisco, California
The M-part should sort you out.....as an aside....the old bung in your link is an FSA compressor http://www.probikeki....php?code=A0806
http://www.bike24.net/images/products/p044549.jpg
All sorted now, got new bung etc and ready to tighten up with headset in place.
Pretty confident bike mechanic (amateur) and reasonably ok with what to do....but
always willing to take any advice offered, so directions would me most appreciated thanks.
Cheers
accountantpete
OAP
Make sure that the stem is clean inside with no pointy bits of metal waiting to stick into the carbon.
Then make sure you have the stem at the correct height - with either spacers above or below - and that there is 1/4 inch of spacer/stem above the end of the steerer.
Basically you then just tighten up using the top cap (but with the stem loose) and check for play by rocking the bike with brakes on. When you are satisfied that there is no play and the bars turn smoothly simply tighten up the stem.
Don't go overboard with the tightening of the stem as this can scar the carbon steerer - tighten up until it feels nice and snug and then tighten up a tad more.
That's it!- but keep a watch for any play that may delevop as the continued braking/rocking causes wear to the steerer as the compression ring rocks back and to.
Then make sure you have the stem at the correct height - with either spacers above or below - and that there is 1/4 inch of spacer/stem above the end of the steerer.
Basically you then just tighten up using the top cap (but with the stem loose) and check for play by rocking the bike with brakes on. When you are satisfied that there is no play and the bars turn smoothly simply tighten up the stem.
Don't go overboard with the tightening of the stem as this can scar the carbon steerer - tighten up until it feels nice and snug and then tighten up a tad more.
That's it!- but keep a watch for any play that may delevop as the continued braking/rocking causes wear to the steerer as the compression ring rocks back and to.
