tapered head tubes

Ask for advice or share your fettling tips
dominicg
Posts: 38
Joined: Tue May 24, 2011 12:36 pm

tapered head tubes

Postby dominicg » Tue Jan 22, 2013 16:27 pm

Hi,
Think I posted this on the wrong forum.

Hi,
Does anyone know if I can use a "straight" 1 1/8 steerer in a tapered 1 1/8 to 1 1/2 head tube e.g. Ribble Gran Fondo? Is there an adapter or something that could be used. I know mtbs are able to get round this but I'm not sure about road bikes.

Thanks,

Dominic

User avatar
smidsy
Posts: 5256
Joined: Tue Jan 17, 2012 20:52 pm

Re: tapered head tubes

Postby smidsy » Tue Jan 22, 2013 17:43 pm

Steerer is straight it's the headset that alters.
Yellow is the new Black.

dominicg
Posts: 38
Joined: Tue May 24, 2011 12:36 pm

Re: tapered head tubes

Postby dominicg » Tue Jan 22, 2013 18:44 pm

thanks smidsy but I still don't get it. Ribble have 2 forks: one for each incarnation of their GF (and neither available to buy BTW) so presumably there is some difference. Are you saying that I just have to get a 11/8 to 11/2 headset? That would be handy! thanks for posting on "buying advce"
cheers

User avatar
smidsy
Posts: 5256
Joined: Tue Jan 17, 2012 20:52 pm

Re: tapered head tubes

Postby smidsy » Tue Jan 22, 2013 19:02 pm

I do not know the Ribble GF specifically but it is common for manufacturers to have different rake forks as the frame sizes increase.

Is that the difference between them?

Yes you need a 1/1'18 1/1'12 headset.
Yellow is the new Black.

ellj22
Posts: 121
Joined: Fri Oct 26, 2012 17:37 pm

Re: tapered head tubes

Postby ellj22 » Tue Jan 22, 2013 19:14 pm

Is it an integrated or semi integrated headset? In other words does a cartridge bearing drop straight in the frame (integrated) or is a cup pressed into the frame and a bearing dropped into that (semi integrated)?

Just checked, doesn't the Gran Fondo have a straight 1 1/8 head tube?

dominicg
Posts: 38
Joined: Tue May 24, 2011 12:36 pm

Re: tapered head tubes

Postby dominicg » Tue Jan 22, 2013 21:15 pm

Thanks, yes you're right at least for the newest version but the 2012 model is meant to be tapered. ITS hidden?? That mean anything?
cheers D

User avatar
smidsy
Posts: 5256
Joined: Tue Jan 17, 2012 20:52 pm

Re: tapered head tubes

Postby smidsy » Tue Jan 22, 2013 21:35 pm

Another point

The forks will be different for the 1/12 as the head tube obviously flares out (bugger a the bottom) so the profile on the shoulders of the forks will be wider so that it lines in with the head tube (providing a nice smooth join).

So if Ribble have two listed that may be why.
Yellow is the new Black.

ellj22
Posts: 121
Joined: Fri Oct 26, 2012 17:37 pm

Re: tapered head tubes

Postby ellj22 » Wed Jan 23, 2013 21:21 pm

ITS will be the headset standard I believe and will define the exact dimensions of the bearing (ID,OD height and angle of bearing). Pretty sure it's a fully integrated headset. Hidden basically means the headset type is either integrated or semi integrated as you cannot see them (or hardly see them once fitted). If it is fully integrated you will not be able to get a shim to step it down to suit a straight fork but cane creek do offer step down integrated headset that MAY suit but best thing to do is ask Ribble, or measure the frame up and check against bearing dimensions.

http://www.canecreek.com/products/headsets/forty

One of the conversion headset lowers from this link may suit and if so then you should be able to order it through any Cane Creek dealership.

What is it you are trying to achieve? are you trying to fit a current 1 1/8 fork to a new 1 1/8 to 1 1/2 taper frame?

dominicg
Posts: 38
Joined: Tue May 24, 2011 12:36 pm

Re: tapered head tubes

Postby dominicg » Thu Jan 24, 2013 13:33 pm

Thanks both of you. Yes that's right. I have ordered a frame from said Ribble's clearance section but it comes without forks. In fact you can't buy the forks seaparately. I have a perfectly good set of forks already (11/8 straight) and I thought the obvious thing to do was to switch it to the new frame etc.
Cheers

User avatar
smidsy
Posts: 5256
Joined: Tue Jan 17, 2012 20:52 pm

Re: tapered head tubes

Postby smidsy » Thu Jan 24, 2013 18:27 pm

I know they say you can't buy them alone, but they must be available for spares/replacement e.g crash damage.

What do they expect you to put on there if they will not sell you some??

The GF forks are sculpted to match the GF frame, anything else is going to be a best guess.
Yellow is the new Black.

ellj22
Posts: 121
Joined: Fri Oct 26, 2012 17:37 pm

Re: tapered head tubes

Postby ellj22 » Thu Jan 24, 2013 19:36 pm

Once you receive the frame get some accurate dimensions of the head tube (to the nearest 0.1mm) and from there you may well be able to find a conversion headset to fit (like the cane creek). However It will be unattractive stepping down from a 1 1/2 lower headset bearing to a 1 1/8 fork due to the small crown size.

I would be surprised if one of Ribble's other 1 1/8 to 1 1/2 forks doesn't fit and suit well.

dominicg
Posts: 38
Joined: Tue May 24, 2011 12:36 pm

Re: tapered head tubes

Postby dominicg » Fri Jan 25, 2013 12:47 pm

Thank you both for advice. I had an email from Ribble yesterday saying that they had found some ex-display GF forks cut at 240mm that I could have for forty quid!! That's just the right length for me so happy days! Glad I don't have to get into all that reduction headset business after all. Thanks again

User avatar
smidsy
Posts: 5256
Joined: Tue Jan 17, 2012 20:52 pm

Re: tapered head tubes

Postby smidsy » Fri Jan 25, 2013 18:39 pm

This is my Basso prior to being built up.

Image

You can clearly see the uncut steerer in the tapered head tube. The shoulders of the forks are designed to blend with the frame. just to give you a better idea :wink:

Obviously this is before the headset is fitted etc.
Yellow is the new Black.


Return to “Workshop”

Who is online

Users browsing this forum: No registered users and 2 guests