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Crank arm clicking and coming loose, What type of arm is it?

delux123delux123 Posts: 19
edited April 2010 in MTB workshop & tech
Hi there ,

I have a specialised enduro and the left crank arm has started creacking/clicking tehn falling off , i think the threads on the arm itself are damaged however i have not seen another crank arm with the same type of thread , normally my bikes have had a square bolt that the arm attached to but on this one its got lots of splines and teh arm is fastened to it with two allen key screws .

What do i need to ask/search for when looking for a replacment crank arm , as in any sort of type or official name of this type of arm.

Your help is much appreciated

Posts

  • nicklousenicklouse Posts: 50,675 Lives Here
    Pictures would be very good.

    as over the years the Enduro has had many different cranks fitted. and even in the same year the different models had different cranks fitted.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • delux123delux123 Posts: 19
    Il take a picture of the crank itself once im home , i have this off the bike itself for now if its any help , thanks for the quick response :) :

    e38b475f.jpg
  • delux123delux123 Posts: 19
    Not sure if the picture itself hasnt worked or if its work blocking it from showing my end , il leave it till im home and get a couple pictures of the thread and crank etc
  • nicklousenicklouse Posts: 50,675 Lives Here
    year?

    which Enduro?
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • delux123delux123 Posts: 19
    Dont know which year but its a enduro supercross fsr

    Pics are below :

    faec68bc.jpg
    2220eeab.jpg

    Says Shimano hollowteck on the arm itself

    Pic of bike if you can tell anything more :

    2f1ba655.jpg
    b266f00e.jpg
  • nicklousenicklouse Posts: 50,675 Lives Here
    well it is a shimano HT 2 crank set.

    see park tools.

    part number will be on the arm somewhere.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • lugsey2k5lugsey2k5 Posts: 960
    what every it is look for the same on ebay. are you sure your tightneing the bolts properly? there should be a small latch going across them you push down once tightened
  • thel33terthel33ter Posts: 2,684
    The Hone probably will, the Dura Ace is road stuff.
    And now you know, and knowing is half the battle
    05 Spesh Enduro Expert
    05 Trek 1000 Custom build
    Speedily Singular Thingy
  • lugsey2k5lugsey2k5 Posts: 960
    id also check the arm lenght is the same. 170 mm 175 mm etc
  • nicklousenicklouse Posts: 50,675 Lives Here
    delux123 wrote:

    why?

    you have arms on it.

    refit and tighten and then check for play in the bearings.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • delux123delux123 Posts: 19
    Like i said the thread on the crank arm itself it squahed / flattened so as soon as i ride it for more than 5 mins it comes loose again , bearings in BB are all fine

    Is there a certain type of crank arm i need to fit those splines or is it just the lenth i need to check ?
  • stu8975stu8975 Posts: 1,334
    Get the part/model no. from the crank arm and get the same one. you may want to have the axle's splines inspected for damage, no good putting a new crank arm on if they are, as it will mostly likely damage the new arm and you are back to square one. Also seeing as the arm has fell off in the past, do you still have the pre-load/crank arm fixing bolt for the l/h side?
  • delux123delux123 Posts: 19
    Not sure what a pre-load/crank arm fixing bolt is , i havnt taken anythin off , the only bolts holding the arm on where the two allen keys
  • stu8975stu8975 Posts: 1,334
    There should of been one of these in the L/H crank arm, you tighten it before you do up the 2 allen key bolts. it screws into the threads on the inside of the axle.
    bb311z00__________760.jpg
  • delux123delux123 Posts: 19
    Hmm not sure on that one , il getr some more pictures of it today , I was outbid on that one on eBay so if anyone else can find one tht would fit from eBay or anywhere else cheap then please let me know
  • whyamiherewhyamihere Posts: 7,598
    Buy this (second one down) and this to fit it.
  • delux123delux123 Posts: 19
    Thanks alot for help so far guys , Would this one fit as well ( And save me buying the tool to fit as it looks like its just an allen key ) ?

    http://www.chainreactioncycles.com/Mode ... elID=31842
  • nicklousenicklouse Posts: 50,675 Lives Here
    so you want to spend £8 to save £3!

    the suggestion above total cost £5. yours £8

    :roll:
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • AlexAlex Posts: 2,086
    The Cheaper, shimano alternative will also ensure you don't overtighten your bearings and destroy them, as is easy to do with the allen key bolts.
  • stu8975stu8975 Posts: 1,334
    Well you lost the first one, no guarantees that a new arm will work so you may end up loosing that one too..£8 a pop or £2 a pop to replace, its up to you.
  • delux123delux123 Posts: 19
    I want the metal one so not the 2.99 one , Would the other fit then and save me buying the tool to fit as it looks like its just an allen key ?
  • stu8975stu8975 Posts: 1,334
    Should be ok, check what size allen key it uses, prob an 8mm, maybe 10mm.
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