Bottom Bracket removal

diliff
diliff Posts: 24
edited August 2012 in Workshop
Along with seemingly almost everyone on the forum, I've started to get a clicking/creaking sound when I pedal. I'm almost certain it's in the drivetrain. I've tightened the cranks/chainrings a few times, and eliminated the pedals as a cause. The problem even happens when the bike is stationary and I put any significant force on either of the two cranks. It's a definite 'click' that seems to echo through the aluminium frame itself, but I'm pretty sure now that it's the bottom bracket. If I push down on the crank, it clicks, and if I remove the pressure, it clicks 'back' again.

I'd like to take the bottom bracket off, check it out and grease it and see if I can fix the issue myself, rather than take it to a LBS. If necessary, I'll replace the bottom bracket too. The thing is, while I've done a reasonable amount of bike maintenance over the years now, I've never needed to take apart the bottom bracket, and after researching it a bit, I'm none the wiser about the huge range of bottom brackets, and the tools that are needed to remove them. It seems like some of them such as this one:
http://www.wiggle.co.uk/lifeline-shiman ... cket-tool/
... go around the BB like a spanner... whereas others, such as this one:
http://www.wiggle.co.uk/lifeline-shiman ... cket-tool/
... slot into the BB.

And some are actual wrench tools, whereas others are just bolts that you use your own wrench to turn. Seems like the all-in-one wrenches would be more sturdy and easier to use, and price doesn't seem to be much of a factor for them, so which would you get?

I've got a Verenti Kilmeston bike, which apparently has a Truvativ Elita BB 68mm BSA, and have done about 5000 commuting miles on it in all kinds of weather, so although it's not a huge distance covered and I'm assuming a BB would have a longer lifespan than that, I guess water could have gotten into it to cause the creaks. I'm a bit confused, what tool do I need to remove this BB? I've looked on Wiggle and it's really hard to know which tool is right for the job. And if I do need to replace the bottom bracket, will the next one use the same tool or a different one!? Given that I'm not likely to be replacing the BB on a regular basis, I'd like to think that the tool will be used more than once.

Any advice (such as links to tools that I can buy online) on tools and potential replacement BBs would be much appreciated. I won't buy the new BB until I've tried to fix the creaking (doesn't appear to be rough to pedal, so I don't think it's necessarily in desperate need of replacement), but I'd like to know what options to consider if that is the next step. Thanks!

Comments

  • Rodders30
    Rodders30 Posts: 314
    Well one of those two should fit, but I cant find a picture of the one your quoting to be sure. You should be able to identify which one you need.
    If not, take a photo and put it on here.

    I think 5000 miles isnt bad? Mine never lasted anywhere near that! You wont repack the BB with grease, just change it for new, they are sealed. But its important to clean and regrease the frame thread as this can cause creaks.

    Are you running a double or triple crank? That will affect the BB choice also.
    Trek 1.5 Road
    Haro MTB
  • diliff
    diliff Posts: 24
    Well, I'll try to get a picture to confirm but from the outside it looks rather like this, which is also Truvativ/SRAM:
    http://www.wiggle.co.uk/sram-gxp-team-b ... t-cup-set/

    I assume from the grooves on the edge of it that the first tool above would fit? I've got a compact double crankset, 34t-50t.
  • phy2sll2
    phy2sll2 Posts: 680
    Does it still click if you take the chain off?
  • diliff
    diliff Posts: 24
    I don't think so, because it only happens when a lot of force is applied through the crank. It's not just a rotational click. Soft pedalling doesn't trigger it.
  • diliff
    diliff Posts: 24
    Here's a photo of the bottom bracket. Excuse the dirt, white is a hard colour to keep clean. :lol:

    http://img43.imageshack.us/img43/6729/2 ... 150152.jpg

    Will the below tool fit? Neither the tool nor the BBs with this tooth pattern seem to mention any standard that they adhere to (only the dimensions, or the brands that it suits)
    http://www.wiggle.co.uk/lifeline-shiman ... cket-tool/

    Other bottom brackets seem to have the same tooth pattern (at least, to my eye, could they be subtly different?) but don't say they are "Hollowtech II / Truvativ GXP compatible" or anything like that, hence my confusion.
  • Rodders30
    Rodders30 Posts: 314
    Hollowtech for me.

    I dont know of any 'similar' but not quite the same.
    Trek 1.5 Road
    Haro MTB
  • diliff
    diliff Posts: 24
    What do you mean Hollowtech for you? That's your choice of BB? Most of the other brands of BB don't say they're compatible with any particular system, and some photos are more obvious than others, so it's not easy to know if they will work or not with the tool I end up purchasing. But if, as you say, they look similar (ie have the same regularity of notches on the outside, like mine) then I guess I will assume they're compatible. It would be nice if there was a resource that listed (with pictures) the different types available, as it is pretty difficult to determine from a lot of shop websites.
  • That tool should work. It does say its hollwtech 2/ truvativ compatible.

    have you checked out the truvativ docs

    and also a quick search threw this up - issues about actually removing the cranks

    The different tools and bbs though is confusing. If in doubt why not ask a question on the wiggle site. FWIW when I got my BB tool I went by the tools serial number rather than relying on the descriptive title.
    The dissenter is every human being at those moments of his life when he resigns
    momentarily from the herd and thinks for himself.
  • The beauty of ordering the tool from Wiggle is that you could try it gently to see if it fits and if it doesn't return it - just a thought cause I can't help id the exact tool :D
  • Wirral_paul
    Wirral_paul Posts: 2,476
    The bottom bracket is a GXP external BB as you linked to, so you want an external BB tool - loads to choose from but all will do the same job. The drive side bearings do seem to fail pretty often with these SRAM / Truvativ GXP Bottom Brackets
  • Rodders30
    Rodders30 Posts: 314
    Sorry, i ment to me thats a hollowtech 2 tool required.
    Trek 1.5 Road
    Haro MTB
  • MrGrumpy
    MrGrumpy Posts: 288
    not got the same BB as yourself however the symptoms you describe are exactly what I have had for the last couple of months, thought it was worn chain rings, worn chain, pedals etc. Could not detect any play in the BB as all but thought what the hell, this week decided to strip the whole lot down and examine and re grease. Well once I got down to removing the BB I found it was only hand tight on the cup you remove!!! Removed the whole thing cleaned the threads, greased up the shell and refitted. No more noise :D for now anyway. Sorry no idea on the tools you need for your job but at least I can concur the noise issue. BTW this was on a brand new Langster frame with new chainset I got under warranty from Specialised.