Author Topic: Chainline - How much deviation therefrom is acceptable?  (Read 10267 times)

Re: Chainline - How much deviation therefrom is acceptable?
« Reply #25 on: 17 August, 2013, 07:52:53 pm »
Are you sure the lockring is the correct thread?  Annoyingly, there are two standards for it.  The wrong type of lockring would bind early when being screwed onto a larger thread.

http://surlybikes.com/uploads/downloads/Track_Cog_5.16.05.pdf
Pretty sure it's the correct thread for both lock ring and cog - both were readily fitted to both sides of the hub using only fingertips.
The issue rests with there being more cog threads on the hub, than there are on the cog itself.
Meaning that there are a few cog threads left exposed when the cog has been fully tightened.
It's these exposed threads which prevent the lock ring from butting up against the cog.
A spacer between the two appears to have sorted that.
Make sense?

rogerzilla

  • When n+1 gets out of hand
Re: Chainline - How much deviation therefrom is acceptable?
« Reply #26 on: 17 August, 2013, 08:04:51 pm »
It shouldn't be a problem if that's all that's causing it.  Apart from thin Cyclo stamped sprockets, I've never seen anything that didn't give roughly 7mm between the hub shoulder and the centreline of the teeth, and I've used Shimano, Surly* and EAI.  Chainline IS dependent on the brand of sprocket used, but not normally by much.  What brand of sprocket is it?
Hard work sometimes pays off in the end, but laziness ALWAYS pays off NOW.

simonp

Re: Chainline - How much deviation therefrom is acceptable?
« Reply #27 on: 17 August, 2013, 08:11:40 pm »
I have the same issue with phil wood sprockets on a miche hub.

Re: Chainline - How much deviation therefrom is acceptable?
« Reply #28 on: 17 August, 2013, 08:21:59 pm »
All sorted now, with a chain line to die for.
My one concession was having to fit a spacer between the lock ring and the cog as the lock ring was bottoming out on the cog thread and not making yer actual contact with the cog itself  ::-)
Does anyone see any issues with that?
I would say don't bother with the spacer, as the lock ring doesn't have to touch the cog (see my earlier reply #14).
Quote from: tiermat
that's not science, it's semantics.

Re: Chainline - How much deviation therefrom is acceptable?
« Reply #29 on: 17 August, 2013, 08:25:47 pm »
....... What brand of sprocket is it?
No brand - from my eastern european lbs - previous one he sold me was Dura-Ace - I ate that in next to no time.
I have one from Brick Lane Bikes (their own brand) waiting in the wings - along with a new chainring and chain to be deployed as and when required.
This is how things are currently lookin'

Re: Chainline - How much deviation therefrom is acceptable?
« Reply #30 on: 17 August, 2013, 08:32:41 pm »
All sorted now, with a chain line to die for.
My one concession was having to fit a spacer between the lock ring and the cog as the lock ring was bottoming out on the cog thread and not making yer actual contact with the cog itself  ::-)
Does anyone see any issues with that?
I would say don't bother with the spacer, as the lock ring doesn't have to touch the cog (see my earlier reply #14).
You mean #13 - Don't you?

Re: Chainline - How much deviation therefrom is acceptable?
« Reply #31 on: 17 August, 2013, 08:51:37 pm »
yes, that's the one.

In essence the lockring is there for emergency situations only - after it's bedded in the cog is not likely to unwind even under skid braking. There's a small chance it will do, but if it winds back a couple of threads before hitting the lock ring, it will still do the job.
Quote from: tiermat
that's not science, it's semantics.

Re: Chainline - How much deviation therefrom is acceptable?
« Reply #32 on: 17 August, 2013, 09:17:19 pm »
yes, that's the one.

In essence the lockring is there for emergency situations only - after it's bedded in the cog is not likely to unwind even under skid braking. There's a small chance it will do, but if it winds back a couple of threads before hitting the lock ring, it will still do the job.
That's a bit ugly in the engineering vein - but does make sense.
Ta.

rogerzilla

  • When n+1 gets out of hand
Re: Chainline - How much deviation therefrom is acceptable?
« Reply #33 on: 17 August, 2013, 09:19:38 pm »
Nah, it will eat away at your soul just knowing that it's not right.
Hard work sometimes pays off in the end, but laziness ALWAYS pays off NOW.

Re: Chainline - How much deviation therefrom is acceptable?
« Reply #34 on: 17 August, 2013, 09:22:26 pm »
^
Mate, my soul's gone.
A long time ago.
To a very dark place.
 ;D
Where I'm comfy  :D

rogerzilla

  • When n+1 gets out of hand
Re: Chainline - How much deviation therefrom is acceptable?
« Reply #35 on: 17 August, 2013, 09:24:20 pm »
Is your soul wearing those shorts?
Hard work sometimes pays off in the end, but laziness ALWAYS pays off NOW.

Re: Chainline - How much deviation therefrom is acceptable?
« Reply #36 on: 17 August, 2013, 09:26:06 pm »
Fuckit!
Trumped!
:P

αdαmsκι

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Re: Chainline - How much deviation therefrom is acceptable?
« Reply #37 on: 18 August, 2013, 05:41:54 pm »
Don't bother with the lockring and problem solved.
What on earth am I doing here on this beautiful day?! This is the only life I've got!!

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