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  • 1" fork crown race setting isue..
  • slimjim78
    Free Member

    Trying to fit a 1″ Chris King crown race to my 1″ steel road fork.

    Am even using a Park race setting tool. Trouble is the race seems just a bit too tight to seat on the fork, its sticking on the lip that its supposed to be pressed against.
    Despite a hefty whack, the crown race just sits there, loosly fitted.

    Do I need to have the base/lip of the steering tube reamed to remove a tiny amount of material, or do I need to get more hefty with the mallet?

    I dont want to whack much harder for fear of bending the fork drop outs on the work surface.
    Never had this problem with 1.1/8th, is it a 1″ thing?

    Posted 12 years ago
    18bikes
    Full Member

    I would suggest getting the fork to a shop with a crown race cutter to check that the fork is the correct size. 1″ should fit in exactly the same way as a 1 1/8′

    Hope this helps

    Matt

    Posted 12 years ago
    stAn-BadBrainsMBC
    Free Member

    forks in freezer – race on heat ???

    worth a punt IMO

    Posted 12 years ago
    slimjim78
    Free Member

    both good advice, thanks

    Posted 12 years ago
    andyl
    Free Member

    dont wack down onto the drop outs – use something under the bridge. TBH I hold the bridge in one hand and bash down with the other – that way no damage to anything.

    Might be LBS time though as it would be best to check the sizes.

    Posted 12 years ago
    slimjim78
    Free Member

    I dont get what sizes there are to check?

    I understand there are different tolerances, but its not like i can order a different size 1″ king race is it?..or is it?

    Posted 12 years ago
    andyl
    Free Member

    It is the tolerance I would want checking.

    Posted 12 years ago
    frank4short
    Free Member

    Failing all of the above, though i reckon the freezer heat idea is the best so far, if you’re feeling brave gently file a small amount of material off of the crown race seat on the fork. As unless your LBS is particularly good they’re unlikely to have a crown race cutting reamer set let alone a 1″ crown race shoulder cutting die. Which means they’ll probably be doing this themselves anyway.

    Posted 12 years ago
    slimjim78
    Free Member

    just tried applying heat, no joy at all (doesnt heat apply expansion inwards as well as outards to a ring?).

    might be tempted to file a minimal amount of the shoulder down, but can detect the cringes already..

    Posted 12 years ago
    andyl
    Free Member

    no the whole ring will expand – the perimeter is longer than the width so the total expansion will end up in the outer and inner diameters being bigger.

    I think I’d be more tempted to file a chamfer onto the crown race – at least that is replaceable.

    They do undersize ones: http://chrisking.com/parts/baseplates

    maybe the one you have is one of them?

    Posted 12 years ago
    MTB-Rob
    Free Member

    Are the bearings Cartridge type bearings and NOT lose bearings?

    If cartridge bearings, get a hack saw and cut a Slot in the the crown race.
    De-burr etc, and fit, the race should spead a little and fit onto fork.
    And with a cartidge bearing having it own “race” to run on you don’t feel the slot.
    Also it is a lot easier to remove the crown race at a later date if needed.

    Posted 12 years ago
    letmetalktomark
    Full Member

    IIRC BITD some 1” forks required a larger than std crown race.

    I have experienced exactly what the OP describes and only remedied it by using a split crown race 😕

    Just a thought.

    Worth a measure up I guess.

    Posted 12 years ago
    slimjim78
    Free Member

    its a Chris King headset & ‘race’ (base plate).

    Not sure of the effect that cutting it would have, being King quality and all that..

    Ive called a fairly local LBS and they reckon they can do the job, but I detected a sense of ‘not quite sure what you mean’ when I was describing the issue over the phone so not sure I want to hand the fork over for reaming as its the original one supplied with the frame back in ’98.

    The base plates are sacrificial to an extent, so may have a go at splitting it unless anyone here screams no to.
    Or may take the fork to LBS and see what they say in the flesh.

    Posted 12 years ago
    taxi25
    Free Member

    I’ve split crown races before, never had a problem. Some fsa models come split as standard.

    Posted 12 years ago
    walleater
    Full Member

    There’s two 1″ headset sizes:

    http://en.wikipedia.org/wiki/Headset_(bicycle_part)#Headset_sizes

    So if it’s not clearing the ramp, there’s a good chance that you are trying to hammer a 26.4 race on to a 27.0 steerer, and you will probably crack the race.

    Posted 12 years ago
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