fork steerer diametres

Questions about purchasing bicycles and parts

fork steerer diametres

Postby uMP2k » Thu Feb 01, 2007 4:12 pm

Just wondering if somebody can clear this up for me.

As my current bike is a much loved mid-80 vintage, the whole world of carbon forks and threadless headsets is a bit strange to me! What I am trying ot work out is whether the description 1 inch (25.4mm) or 1 1/8 inch (28.6mm) refers to the actual steerer or to the headtube it is designed to fit into. With the new types of fork/headset/stem combinations how much space is there between the steerer and the actual inside surface of the head tube - I presume it should be a fairly snug fit?

Any comments welcome!
User avatar
uMP2k
 
Posts: 614
Joined: Mon Nov 27, 2006 5:22 pm
Location: Perth, Western Australia

by BNA » Thu Feb 01, 2007 4:57 pm

BNA
 

Postby mikesbytes » Thu Feb 01, 2007 4:57 pm

Can you post a picture of the head of your frame
A helmet saved my life
User avatar
mikesbytes
Super Mod
Super Mod
 
Posts: 14532
Joined: Thu Dec 01, 2005 10:42 pm
Location: Tempe, Sydney

Postby uMP2k » Thu Feb 01, 2007 4:58 pm

mikesbytes wrote:Can you post a picture of the head of your frame


Will do when I get home from work! The frame in question is a 2004 Apollo RD Z1000 that I am building up for a friend and they are looking at putting carbon forks on it.
User avatar
uMP2k
 
Posts: 614
Joined: Mon Nov 27, 2006 5:22 pm
Location: Perth, Western Australia

Postby Mulger bill » Thu Feb 01, 2007 5:29 pm

AFAIK the sizing is the actual diameter of the steerer tube.

Bruce, my old Shogun MTB got a conversion from a 1 inch rigid fork to a 1 1/8 suspension fork with a headset swap.

Not sure if this applies to roadies too, I don't keep any references at work to check.

Hope this helps. :)


Shaun
User avatar
Mulger bill
Super Mod
Super Mod
 
Posts: 25268
Joined: Sun Sep 24, 2006 2:41 pm
Location: Sunbury Vic

Postby LuckyPierre » Thu Feb 01, 2007 7:45 pm

The diameter refers to the actual steerer, but I think that the issue of fit is pretty complicated - almost variable from frame to frame. Things to consider include head tube diameter, whether the frame was designed for an integrated headset or not ......
But - I've sourced (fleaBay) a 1" threaded carbon fork as an experiment. If it works out OK, I'm thinking of getting a more serious one for a project. There are 1" carbon forks available, ie. http://cgi.ebay.com.au/Reynolds-Ouzo-Pro-Carbon-Fork-1-x-43mm-rake-NIB-NR_W0QQitemZ250078553078QQihZ015QQcategoryZ56196QQrdZ1QQcmdZViewItem.
You might get a 1 1/8" fork to fit in a frame that once had a 1" fork, but it would pretty much be pot luck.
User avatar
LuckyPierre
 
Posts: 1432
Joined: Fri Jul 14, 2006 4:37 pm
Location: Canberra, ACT

Postby uMP2k » Thu Feb 01, 2007 11:18 pm

Here is are two photos of the headtube in question:

Image Image

Any ideas what sort of headset/fork I need?
User avatar
uMP2k
 
Posts: 614
Joined: Mon Nov 27, 2006 5:22 pm
Location: Perth, Western Australia

Postby Mulger bill » Thu Feb 01, 2007 11:28 pm

It looks like you might need a 1 inch steerer, with a standard, (non integrated) headset. Bit hard to be sure, your LBS will definitely be able to help, you'll need them to fit the headset anyway, I wouldn't recommend the "lump of wood and a hammer" installation. :shock:
User avatar
Mulger bill
Super Mod
Super Mod
 
Posts: 25268
Joined: Sun Sep 24, 2006 2:41 pm
Location: Sunbury Vic

Postby Mulger bill » Thu Feb 01, 2007 11:31 pm

Sorry, forgot :oops: Can you get a threadless headset for a 1 inch steerer? (showing total ignorance of roadie tech again :oops: )
User avatar
Mulger bill
Super Mod
Super Mod
 
Posts: 25268
Joined: Sun Sep 24, 2006 2:41 pm
Location: Sunbury Vic

Postby uMP2k » Thu Feb 01, 2007 11:35 pm

Mulger bill wrote:It looks like you might need a 1 inch steerer, with a standard, (non integrated) headset. Bit hard to be sure, your LBS will definitely be able to help, you'll need them to fit the headset anyway, I wouldn't recommend the "lump of wood and a hammer" installation. :shock:


That is pretty much what I thought! I will take the frame down to the LBS and find out for sure.

BTW - good to get a response so late in the night for somebody in the East!
User avatar
uMP2k
 
Posts: 614
Joined: Mon Nov 27, 2006 5:22 pm
Location: Perth, Western Australia

Postby Mulger bill » Thu Feb 01, 2007 11:41 pm

No worries mate, it's called Arvo shift.

Shaun
User avatar
Mulger bill
Super Mod
Super Mod
 
Posts: 25268
Joined: Sun Sep 24, 2006 2:41 pm
Location: Sunbury Vic


Return to Buying a bike / parts

Who is online

Users browsing this forum: dudleygb, Google Adsense [Bot], rifraf, Yahoo [Bot]



Support BNA
Click for online shops
Torpedo 7 Torpedo7 AU
Ground Effect Ground Effect NZ
Chain Reaction Cycles CRC UK
Wiggle Wiggle UK
Cycling Express Cycling Express
Ebay Ebay AU
ProBikeKit ProBikeKit UK
Evans Cycles Evans Cycles UK
JensonUSA Jenson USA
JensonUSA Competitive Cyclist