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Replacing my headset - Help!

  • 24-06-2010 9:46am
    #1
    extra-ordinary_
    Registered Users, Registered Users 2 Posts: 1,994 ✭✭✭


    The headset on my roadbike is knackered and needs replacing. It's a 1" threadless Cane Creek.
    I went to the LBS and got a new headset but the one they gave me is about twice the height of my old one.

    If I install this new headset, will it not alter the geometry of my frame, increasing the ride height at the front of the bike and so increasing the rake and wheelbase length? The frame cups on the new set are about 15-20mm in height compared to around 10mm on my original set. The guy in the shop said the only difference the height of the new one will make will be that I'll have to use fewer spacers under the stem.


Comments

  • #2
    Morgan
    Registered Users, Registered Users 2 Posts: 2,481 ✭✭✭Morgan


    Only the lower cup will affect the geometry, and even then not by much. You can leave a spacer off the top to accommodate the upper one.

    15-20mm outside the frame sounds enormous though. The bearings must be huge. What model headset is it?


  • #3
    extra-ordinary_
    Registered Users, Registered Users 2 Posts: 1,994 ✭✭✭extra-ordinary_


    The new one is taper roller, the brand is Rudelli.

    Looking at it again now, lower cup is about 12-13mm outside the frame, upper cup is easily 20mm.

    My old lower cup (although I don't have them in front of me) was about 7-8mm with a little more than that on the top.


  • #4
    Morgan
    Registered Users, Registered Users 2 Posts: 2,481 ✭✭✭Morgan


    Never heard of that brand but it'll probably be fine.

    Sounds like the lower cup only extends 5mm more than the old one - I can't imagine that having a significant effect on your bike's geometry.


  • #5
    lescol
    Registered Users, Registered Users 2 Posts: 648 ✭✭✭lescol


    What bike are you fitting the headset to?
    There are still a few 1" headsets for sale http://www.sjscycles.co.uk/category-Headsets--1-Ahead-586.htm if you're not happy with the Rudelli


  • #6
    extra-ordinary_
    Registered Users, Registered Users 2 Posts: 1,994 ✭✭✭extra-ordinary_


    Bike is a Dawes Discovery 701. The new set looks really huge and bulky compared to my old one.


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  • #7
    lescol
    Registered Users, Registered Users 2 Posts: 648 ✭✭✭lescol


    OK, have you removed the old headset? The likelihood is that it contains cartridge bearings which can be easily replaced.


  • #8
    extra-ordinary_
    Registered Users, Registered Users 2 Posts: 1,994 ✭✭✭extra-ordinary_


    Yeh I've removed the old headset. It had steel caged ball bearings. The cages had broken up with the rust. Races were fairly pitted from the rust also. I'm just looking for a direct replacement, but I'm getting bogged down in stack heights, integrated, semi-integrated, etc.


  • #9
    lescol
    Registered Users, Registered Users 2 Posts: 648 ✭✭✭lescol


    Have a look here http://www.parktool.com/repair/readhowto.asp?id=65

    You'll need to remove the bearing cups and crown race, fit the new cups and race and then reassemble the headset. It can be done at home using makeshift tools, I've done it, but you may feel after reading Park Tools that it would be easier to have a bike shop do it for you. Or, there's Mr Skeffington http://www.boards.ie/vbulletin/showthread.php?t=2055611674 who has received nothing but praise on Boards.


  • #10
    extra-ordinary_
    Registered Users, Registered Users 2 Posts: 1,994 ✭✭✭extra-ordinary_


    As I said, I've already removed the old headset. My problem is finding a suitable replacement


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