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  • Fitting new forks. How tight should top nut be?

     Abzz updated 11 years, 9 months ago 5 Members · 11 Posts
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  • Abzz

    Member
    10 April 2009 at 4:09 pm

    Hi

    I have finally got around to fitting the Rock Shox Toras I brought from Filthy’s big clear out.

    Went like a dream

    Wheel off…Brake caliper off…Top bolt off…Stem off…Bars hang down nicely

    spacers off…Couple of taps with a rubber mallet and the old forks slide down through the headset. The bearings stayed up in the headset the forks came off with the just the cover and the crown race.

    A few taps with a hammer and screwdriver around the crown race and its loose!…Measure up the steerer tube and its almost perfet, same length as old one. Drop the crown race on to the new forks and manage to press it on with my fingers down to the crown.

    Reassemble the forks on the bilke with a bit of grease in the bottom bearings and tighten up the top bolt and nip up the stem bolts. and then a small problem 🙁

    I tightened the top bolt a fair bit to ensure i took all the slack out and when i swivel the forks from side to side they are a bit notchy 😕

    If loosen the top bolt and just nip it up the notchiness goes ?

    BTW i didnt notice the notchiness with the old forks?

    Question How tight should the top bolt be? Can i just nip it up and then tighten the stem bolts to hold the heaset together?

    BTW it was all going too well. the forks are IS fitting and my XT callipers are post mount so I got a IS – PM adaptor for 160mm rotors from my LBS It was one he found loose in a draw with no label. Yup you guessed it, its for 180mm rotors so no good for me 👿 he shut early today so back there tomorrow 😕

  • mr-marty-martin

    Member
    10 April 2009 at 4:19 pm

    im sure you just nip it up reasonably then secure it with the stem…….

  • Abzz

    Member
    10 April 2009 at 4:32 pm

    OK marty so the notchiness could be due to me overtightening the top bolt?

  • BigBadJohn118

    Member
    10 April 2009 at 4:35 pm

    And if you have it too slack then when u have the front brake on and you move the bike back and forth u will feel the forks rocking around 😯

    if you have it too tight the Steering can be how do i describe it ‘Rough’ ?

  • Abzz

    Member
    10 April 2009 at 5:14 pm

    Cheers John I will test it out tomorrow when I have the caliper back on with the right adapter!

  • bry5

    Member
    10 April 2009 at 5:44 pm

    Abzz,

    Are you sure you have the crown race installed flat on top of its seat on the fork crown?

    Bry

  • Abzz

    Member
    10 April 2009 at 5:51 pm

    Abzz,

    Are you sure you have the crown race installed flat on top of its seat on the fork crown?

    Bry

    Well it seemed to be down as far as it would go? (no gaps to the fork crown) i didnt hit it with anything to seat it though, I didnt want to risk damaging it. Wouldnt the pressure of doing the top nut up ensure it was seated? Would that cause the problem Bry?

    Do you think its worth taking it apart and taping it down to be sure?

  • bry5

    Member
    10 April 2009 at 6:23 pm

    You can usually tell if its not seated flat by holding the crown race up at eye level, I just thought I would ask as your description of the installation suggested it went on without exerting any force, you usually need to give them a firm tap down, if not a good clout !

  • Steve Kish

    Member
    10 April 2009 at 7:50 pm

    Loosen off the top bolt and two bolts holding the stem to the steering column.

    Lock on the front brake and try and rock the bike back, gently tightening the head bolt until there is no movement between the two parts of the top part of the headset. You can check this by putting your finger on the front of the top bearings to feel any movement between the two pieces of the headset.

    Lock the stem with the two bolts to the steerer and then just very slightly loosen off the top bolt – it’s job is done.

    If newly fitted and greased, check again after riding a few hundred yards and doing some braking, just to take up any small settlement gaps.

  • Abzz

    Member
    10 April 2009 at 11:19 pm

    Cheers Steve, I will give it a go tomorrow when i can use the front brake!

  • Abzz

    Member
    11 April 2009 at 11:45 am

    Sorted!

    Yes I think I was trying to do the top nut up too much before as the notchness has gone and there is no movement in the headset when you brake.

    The RS Toras seem to have a lot more travel than my old Manitous 8)

    Thanks for your help guys

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