Octalink & ISIS BB Tool Are They Both The Same?

Hi the chainguide on the youngest boys bike (in my opinion!) is pushing his chainline out of whack and somehow causing his bike to keep lunching rear mechs. (Second one croaked this morning) so i would like to remove the said guide and see if this helps. Alas i only have a square taper BB tool and i see the buggers have made the axle just SLIGHTLY to large for the BB tool :evil:. So i now have to get ANOTHER one...... Which looks near identical! (i love progress :roll:).
Just wanted to know if the Shimano Octalink BB tools are compatible with the ISIS BB tools (i'm not 100% sure what BB the bike has)...... Though i swear it said FSA on the drive side BB cup so to be honest i'm at a bit of a loss which to purchase (cranks are RPM's of some kind?).
Thanks.
Just wanted to know if the Shimano Octalink BB tools are compatible with the ISIS BB tools (i'm not 100% sure what BB the bike has)...... Though i swear it said FSA on the drive side BB cup so to be honest i'm at a bit of a loss which to purchase (cranks are RPM's of some kind?).
Thanks.
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Or all of the above.
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Parktools
The bike arrived from it's last owner as a single speed (but where we live this is borderline "insanity"). So i swapped the transmission from a donor bike and within hours it had torn off the mech hanger and destroyed mech #1!!! (the return spring for the mech had snapped so the cogs just hung there). This time it has happened when he lent the bike to a friend and once again the mech return spring is kaput and the mech is just hanging instead of tensioning the chain!!
When the bike is in the large cog at the rear WITHOUT the chain device attached by eye it appears to have about similar chain length (the mech is in about the same place) as mine in the same gear so i'm not sure if chain length is the cause however if you can show me a way to check if this COULD be the case i will of course check
Thanks.
Then add 2 whole links.
If it's too short, it will continuously trash the rear mech.
Even if there is a BB mounted chain device, it shouldn't cause the chain to drop into the BB - it sounds like you have a badly set up chainguide.
Pictures from a few different angles so we can see what's going on, please - and in the meantime, check that chain. I'm almost certain it's too short.
But as to the issue it could be Chainline but ht will be incorrect bb for whatever cranks are fitted.
But if the rear mech spring is going then it is something very different.
But without knowing what th bike is. What the set up is etc who knows.
But chain length should be as above include ant chain device. But if a fully check with the sus fully compressed.
Parktools :?:SheldonBrown
This is the frame (NOT his mind) don't know anything about it really infact when i emailed On One for a mech hanger they said they don't even have spares anymore
viewtopic.php?p=16352546
Thanks.
So what cranks?
What bb?
What bb width? Etc etc etc.
Parktools :?:SheldonBrown
Can't identify parts if i can't see them/didn't install/or purchase myself. The nipper has returned now so i will get some pics up as soon as poss.
Thanks.
Thanks.
Thanks.
Oh, and those shots show us NOTHING about the chainguide alignment.
Parktools :?:SheldonBrown
And to top it off he ain't here so can't tell me where he put the chain :roll: *jesus wept*!!
Not sure whats up with the pics tbh i have Firefox and can see them??
Thanks.
The roller isn't a guide, it's just there to stop the slack from the mech whipping about from unseating the chain from the chainring.
Thanks.
Get one.
Thanks.
Thanks.
right. So... if you want to keep it as a geared setup, then you're going to need some kind of chain device. The simplest, and most commonly available one is just a front mech, with the limit screws set so that the mech keeps the chain on.
You can ditch that thing that's on there now, but that may mean the BB won't fit properly.
I'm rusty on how the old style BBs measured up, so I'll let Nicklouse handle that one.
Parktools :?:SheldonBrown
Thanks for the help if i had hair it would be all over the floor by now LOL!
EDIT cheers Nick i won't mess with them.
Thanks.