Another Bottom Bracket question...

Newfish

Hello all,

Whilst giving my bike a thorough clean today I have managed to knacker my bottom bracket. :evil:

It is just the non drive side retaining screw thread, and believe me its beyond salvaging.

My question is simple. Can I just replace the axle, or do they come as one complete unit? It is a Shimano, Octalink spline, cartridge bearing, 73mm, or at least thats what it says on the Spesh website, and looks like this.

Any help appreciated, and all name calling is totally justified. :x

StefanP

You'd have to replace the whole thing I'm afraid and the link isn't an octalink bb.

cooldad

I won't even ask how you managed that.

Newfish

cooldad wrote:

I won't even ask how you managed that.

Well since you asked so nicely I shall divulge my stupidity. I have a crank removal tool from some time ago, about 15yrs, and decided that I would remove my cranks to give them a bloody good clean and a regrease etc. However I didn't check that the little spindle that pushed the crank off does a really good job of pushing into the hole the retaining bolt screws into, destroying the tread. I then destroyed the retaining bolt trying to sort it out.

End result, new BB. Proper hacked off as I've only just got it all back together with the new brakes. Haven't even ridden it yet cos of the weather.

@ StephanP - The spesh website says its and Octalink Spline 73mm, however it doesn't look like

This

or this

but like the original link I posted.

mrmonkfinger

Your first post is a square taper BB. if that's what your cranks take, then that's what you need. Double check the shell width - should be either 68mm or 73mm. I'd guess at 68mm on the Rockhopper. Also measure the total axle length - probably 113mm. You'll want 'English thread'.

Or, local friendly bike shoppe

cooldad

Newfish wrote:

cooldad wrote:

I won't even ask how you managed that.

Well since you asked so nicely I shall divulge my stupidity. I have a crank removal tool from some time ago, about 15yrs, and decided that I would remove my cranks to give them a bloody good clean and a regrease etc. However I didn't check that the little spindle that pushed the crank off does a really good job of pushing into the hole the retaining bolt screws into, destroying the tread. I then destroyed the retaining bolt trying to sort it out.

End result, new BB. Proper hacked off as I've only just got it all back together with the new brakes. Haven't even ridden it yet cos of the weather.

@ StephanP - The spesh website says its and Octalink Spline 73mm, however it doesn't look like

This


or this

but like the original link I posted.

Aaah yes there's a little lumpy thing that sticks on the end. I tried that once too, but with less disastrous consequences.

chez_m356

Newfish wrote:

cooldad wrote:

I won't even ask how you managed that.

Well since you asked so nicely I shall divulge my stupidity. I have a crank removal tool from some time ago, about 15yrs, and decided that I would remove my cranks to give them a bloody good clean and a regrease etc. However I didn't check that the little spindle that pushed the crank off does a really good job of pushing into the hole the retaining bolt screws into, destroying the tread. I then destroyed the retaining bolt trying to sort it out.

End result, new BB. Proper hacked off as I've only just got it all back together with the new brakes. Haven't even ridden it yet cos of the weather.

@ StephanP - The spesh website says its and Octalink Spline 73mm, however it doesn't look like

This

or this

but like the original link I posted.

are you sure? can't really see the removal tool pushing into the thread of a square taper bb, an octolink yes, which is why they have these, to stop that problem

http://www.edinburghbicycle.com/product ... moval-tool

Newfish

I have just received the Crank puller I ordered yesterday (Impressive service from Merlin Cycles) However I didn't read the small print and have ordered the Park Tool CCP-44 which says it can't be used on square tapered cranks. :oops:

What is the reason for this? or will it actually be ok to use?

The only reason I ask is that the package it came in is damaged and I'm not so sure Merlin will have it back. It arrived damaged but foresee problems...Is it useless to me?

nicklouse

Newfish wrote:

What is the reason for this? or will it actually be ok to use?

the end is too big.

and no it will damage either the tool or the cranks.

Newfish

Bother, thanks for the quick reply. I shall wait and see what Merlin say.

booldawg

If the crank you have is a square taper then I bought one in Chain Reactions Jan sale for £2.49. This'll have the non-drive side threaded cup you need. They're made out of a type of plastic and quite easily damaged, especially if someone has over-tightened it.

There is also (yet another) tool you need to remove/replace the BB.

Newfish

booldawg wrote:

If the crank you have is a square taper then I bought one in Chain Reactions Jan sale for £2.49. This'll have the non-drive side threaded cup you need. They're made out of a type of plastic and quite easily damaged, especially if someone has over-tightened it.

There is also (yet another) tool you need to remove/replace the BB.

Thanks for the info. I have sent the wrong one back and exchanged for a icetoolz one which is correct. Already ordered the removal tool and hopefully got that right. Just holding off on ordering my BB till I have the old one out and I can make damn sure I get the right one.

Newfish

Hello once again people. Last question about this I promise. :?

I have removed the bottom bracket and it is this one.



Now does the 68 refer to the thread size? I'm hoping it doesn't, CRC have stock but have 30 options.

The one that is 68mm comes in 110mm, 115mm & 118mm, however I need 113mm, as it clearly states.

I think I am right in thinking that I require the 73mm 113mm English thread (as someone already said.) but am now a bit puzzled as to why it would have 68 in massive font on it!

Any help would be awesome before I order the wrong part again.

Thanks.


EDIT - just found this on RoseBikes which might be the right one. 68mm 113mm

nicklouse

no it is the shell width.

PS reading Parktools would answer all of your questions.

Newfish

nicklouse wrote:

no it is the shell width.

PS reading Parktools would answer all of your questions.

Thanks for the quick reply Nick.

I have but not with regard to this until now, and it didn't help. Your reply doesn't help much either though, which one do I need, or am I right, its the 73mm 113mm English thread.

nicklouse

you need a 68mm 113mm presuming the one in the picture is correct.

Newfish

Thanks Nick, the one in the picture is the dead one I removed, so yes.

Cheers fella.