Shimano Octalink

Sorting out your thrunge brackets, fettling your inter-rositers and even stuff about bike parts.
iwilldoit
Posts: 415
Joined: Thu Dec 26, 2013 15:08 pm
Contact:

Shimano Octalink

Postby iwilldoit » Mon Mar 10, 2014 22:46 pm

Hi All

Just looking at replacing my BB I have a crank puller but is to small, it goes straight through the hole in the BB, I have read you can get a pluging cap and also seen a you tube clip of a fella in America using a coin in side the BB to press the crank puller against, any one done this if so what sort of size coin am I looking at?

Also when it comes to tightening the collars that hold the BB in the frame is there a torque for them, or will this come in the info with the new BB?

My BB is this style http://www.chainreactioncycles.com/shim ... -prod34653

User avatar
nicklouse
Lives Here
Posts: 80713
Joined: Thu Mar 20, 2003 12:14 pm

Re: Shimano Octalink

Postby nicklouse » Mon Mar 10, 2014 23:25 pm

Coins bend and cause more issues than you need.

Yes they need to be tight, Park tools lists the numbers if you have a tool that you can set. Of use a couple of grunts.
"Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
Parktools :?:SheldonBrown

User avatar
craker
Posts: 1613
Joined: Wed Nov 07, 2007 21:34 pm

Re: Shimano Octalink

Postby craker » Tue Mar 11, 2014 12:25 pm

Why do you need a crank puller? I've an octolink crankset and I seem to remember the cranks just comes off once the bolt has been removed.

As for torque, you don't need a torque wrench for bottom brackets just apply a sensible amount of grunt, as Nick says.

iwilldoit
Posts: 415
Joined: Thu Dec 26, 2013 15:08 pm
Contact:

Re: Shimano Octalink

Postby iwilldoit » Tue Mar 11, 2014 12:46 pm

Hi

Thanks for the replies, not 100% sure about the puller just every where I read they all say to use a puller ( all very new to me this ) Just trying to get everything in place for when I do the job.

When putting the cranks back on is on of the splines different ie one bigger/smaller for locating are you just putting the cranks opposite each other so you know they are in the right place.

User avatar
craker
Posts: 1613
Joined: Wed Nov 07, 2007 21:34 pm

Re: Shimano Octalink

Postby craker » Tue Mar 11, 2014 12:57 pm

iwilldoit wrote:When putting the cranks back on is on of the splines different ie one bigger/smaller for locating are you just putting the cranks opposite each other so you know they are in the right place.


The axle is part of the drive side crank, you just pop the non-drive crank on 180 degrees round though I don't think there's any difference in the splines preventing you from locating it differently.

User avatar
njee20
Posts: 9488
Joined: Mon Nov 26, 2007 20:06 pm

Re: Shimano Octalink

Postby njee20 » Tue Mar 11, 2014 13:06 pm

They're not all self extracting. A couple of 5ps will probably do it, would want more than one though.

When putting the cranks back on is on of the splines different ie one bigger/smaller for locating are you just putting the cranks opposite each other so you know they are in the right place.The axle is part of the drive side crank, you just pop the non-drive crank on 180 degrees round though I don't think there's any difference in the splines preventing you from locating it differently.


That's Hollowtech 2, not Octalink. Octalink has 8 equal splines, and there's nothing on the splines to differentiate, you just line them up opposite each other.

iwilldoit
Posts: 415
Joined: Thu Dec 26, 2013 15:08 pm
Contact:

Re: Shimano Octalink

Postby iwilldoit » Tue Mar 11, 2014 19:19 pm

Hi Njee20.

Thanks for the reply, did make me smile I bought a tool kit and thought to myself right I have got everything to look after my bike, first job and ****** ordered and plug tool.

Is it possible to find out the length of the BB before taking it all apart, emailed Specialised no reply as yet, emailed a few companies and they said the spec will be on the old BB, just want to order a new one, pull it a part and put it back together.

The bike is a Specialised Carve 29er 3x10 speed, on the Specialised specs it says it's 73mm but not the length.

User avatar
alexthebear
Posts: 318
Joined: Sun Dec 08, 2013 22:23 pm

Re: Shimano Octalink

Postby alexthebear » Tue Mar 11, 2014 19:56 pm

I'm almost positive you already know what version your bike has but don't some Carves come with press fit bottom brackets? I'm sure my mate was banging on about that the other day (although I have been known to be wrong once or twice :wink:)

I have literally just had the cranks off my 2011 Camber which is sporting a Shimano BB-ES25 and I made 3 lovely little bowls for borrowers out of 5ps and a 1p before I stopped being a tight ars* and bought the shimano plug for my standard crank puller :lol: thankfully no damage to the internal threads but I'm pretty sure that's more luck than judgement.

Going to be fitting a Superstar bb mounted chain guide as soon as I get my bb tool through the post and this thread has answered a few questions I had so cheers for that :)

User avatar
njee20
Posts: 9488
Joined: Mon Nov 26, 2007 20:06 pm

Re: Shimano Octalink

Postby njee20 » Wed Mar 12, 2014 09:21 am

I'm almost positive you already know what version your bike has but don't some Carves come with press fit bottom brackets?


Not if it's Octalink.

Is it possible to find out the length of the BB before taking it all apart, emailed Specialised no reply as yet, emailed a few companies and they said the spec will be on the old BB, just want to order a new one, pull it a part and put it back together.


The other measurement is just the axle width - once you've got the cranks off just measure it.

User avatar
apreading
Posts: 3222
Joined: Thu Sep 18, 2008 23:57 pm

Re: Shimano Octalink

Postby apreading » Wed Mar 12, 2014 11:46 am

All the specialized octalinks I have seen are 118. Most are 68mm but some 73mm, as this seems to be.

If you get it from CRC http://www.chainreactioncycles.com/shim ... -prod34653 and find its the wrong one then you have free returns, so no harm in taking a punt.

Or if you want, you could order both sizes from wiggle: http://www.wiggle.co.uk/shimano-es25-oc ... 5360249421 and send back the one you dont need.

User avatar
cooldad
Posts: 28161
Joined: Sat Apr 17, 2010 22:01 pm

Re: Shimano Octalink

Postby cooldad » Wed Mar 12, 2014 19:30 pm

Or just measure it in situ.
I don't do smileys.

There is no secret ingredient - Kung Fu Panda

London Calling on Facebook

Parktools

User avatar
njee20
Posts: 9488
Joined: Mon Nov 26, 2007 20:06 pm

Re: Shimano Octalink

Postby njee20 » Wed Mar 12, 2014 20:01 pm

It'll take 10 seconds with a tape measure, don't just blindly order things which may or may not be right.

iwilldoit
Posts: 415
Joined: Thu Dec 26, 2013 15:08 pm
Contact:

Re: Shimano Octalink

Postby iwilldoit » Wed Mar 12, 2014 20:53 pm

cooldad wrote:Or just measure it in situ.


I did this yesterday, but not 100% sure if it's right, I took the pugs out of the pedals put a 5p in the one end to have something to measure to and used a vernier though the other side and I got 113mm, but hopefully the Shimano plug for my pedal removal tool will be here tomorrow so I can measure it properly.

Was hoping to order the BB take it apart once and have it all sorted, a friend of mine was telling me can tighten the collars a bit more to take up some of the play, I have a ride planned with my son on Sunday is it best not to use the bike with a bit of play in the BB ??

User avatar
njee20
Posts: 9488
Joined: Mon Nov 26, 2007 20:06 pm

Re: Shimano Octalink

Postby njee20 » Wed Mar 12, 2014 21:09 pm

He's wrong, there's nothing you can do, it's a sealed unit, in fact the RH cup is actually just the BB itself. There were some adjustable Shimano BBs years ago, I had a Dura Ace one, lasted forever, but was a pain.

Measure with the vernier with the cranks off, too much faff with them on.

You won't do any damage riding it whilst it's got some play.

User avatar
nicklouse
Lives Here
Posts: 80713
Joined: Thu Mar 20, 2003 12:14 pm

Re: Shimano Octalink

Postby nicklouse » Wed Mar 12, 2014 21:19 pm

iwilldoit wrote:
cooldad wrote:Or just measure it in situ.


I did this yesterday, but not 100% sure if it's right, I took the pugs out of the pedals put a 5p in the one end to have something to measure to and used a vernier though the other side and I got 113mm, but hopefully the Shimano plug for my pedal removal tool will be here tomorrow so I can measure it properly.

Was hoping to order the BB take it apart once and have it all sorted, a friend of mine was telling me can tighten the collars a bit more to take up some of the play, I have a ride planned with my son on Sunday is it best not to use the bike with a bit of play in the BB ??

As above he is wrong.

If you look up the crank part number of tell us what the part number is we could tell you what length you need.
"Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."

Parktools :?:SheldonBrown

iwilldoit
Posts: 415
Joined: Thu Dec 26, 2013 15:08 pm
Contact:

Re: Shimano Octalink

Postby iwilldoit » Sun Mar 16, 2014 12:33 pm

Hi All

Thanks for the replies, went for a early ride this morning and plucked up courage to pop the BB out the info on it is 73mmx113mm with a little jk by it, Shimano bb-ES25, BC 1.37 x 2.1.

I take it the BB 51 ockalink BB will be better quality as long as I order the 73x113 BB51 I take it they will be the same thing ??

User avatar
apreading
Posts: 3222
Joined: Thu Sep 18, 2008 23:57 pm

Re: Shimano Octalink

Postby apreading » Sun Mar 16, 2014 14:19 pm

Yes, the 51 is supposed to be better - I am not convinced that there is much in it - I think the main difference is that the end piece of the 25 is plastic whereas on the 51 its metal.

User avatar
stubs
Posts: 5051
Joined: Sat Jan 27, 2007 19:55 pm

Re: Shimano Octalink

Postby stubs » Sun Mar 16, 2014 23:28 pm

I fitted an ES-51 BB to a mates frame thursday to replace the worn out ES-25 and it came with a plastic left hand cup. Dont think they have come with a metal one for a while, luckily I never throw anything out and found a metal one in my spares box.
Fig rolls: proof that god loves cyclists and that she wants us to do another lap


Return to “MTB Workshop & Tech”

Who is online

Users browsing this forum: No registered users and 0 guests