Hi Redcogs,
Don't worry, it should be simple to remove the sprocket(with the correct tools), I'll try and talk you through it...please accept my apologies in advance, if the first part is not applicable to you but I have presumed that this information may also be of interest to others too!
It is best if you rehearse all the operations in your head, before "going for it!"
The first thing to realise is that, if you have ever used a cassette remover and chain whip to remove a cassette, you will be tightening up the sprocket on the Rohloff hub, if you attempt to use the chain whip in the same direction as you would with a cassette hub. If you have done this and used enough force to almost snap the chain whip, then you now have the sprocket on really, really tight!
The reversal of the sprocket should be planned, in advance of needing to do it...given the massive service life of the sprocket, the need to reverse it, shouldn't be a thing that takes you by surprise. I say this because you will require access to a large vice, which is mounted securely to a workbench.
Remove the QR skewer, locate the sprocket removal tool's lugs into the slots on the hub and replace the QR skewer...this is important to maintain secure location. Tighten the QR fully and then back it off a quarter of a turn.
Now locate the flats of the tool in the jaws of the vice and clamp the tool securely.
Take the chain whip and wrap it carefully around the sprocket and use its leverage to turn the sprocket ANTI CLOCKWISE.(when viewed from the sprocket towards the hub)This may take considerable force.
NOTE THAT BECAUSE THE HUB IS INVERTED (SPROCKET SIDE DOWN)THIS WILL MEAN LEVERING THE CHAIN WHIP CLOCKWISE, AS YOU SEE IT, WHEN LOOKING FROM ABOVE...once the sprocket moves, remember that you have the QR skewer locking the tool on and remove it (that's why I said you must back it off a quarter of a turn.)
I hope that this is clear...if it is not, please re-read what I've written and if it still does not make sense...please contact me.
All the best,
Andy B. (Thorn's designer)
quote:
Originally posted by redcogs
my sprocket needs reversing, because of wear (it has a 'wave' type appearance). So, i purchased the said special tool, which fits a treat.
Problem is that freeing the sprocket seems to require a great deal of force - more than i have been prepared to apply so far - i'm a bit worried about damaging any of the hubgear internals... the 'chainwhip' that i'm using seems to be straining to near its breaking point (it is also new) so i have given up (so far).
Question is, has anyone else experienced this prob? Any tips? Should i use a hammer on the cog?
i'm a bit miffed at my inability to perform what seems to be a simple operation.[
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