Eccentric Bottom Bracket Adjustment

[SatNavSaysStraightOn]

Having one of those insane, do I know what I am doing moments prior to leaving on my first solo tour tomorrow morning... (OK so nothing new there except of for the first solo bit..)

Can someone please confirm that with an eccentric bottom bracket, the adjustment should not leave the thinnest part against the adjustment nuts? That is the one position that is 'bad' isn't it?

so the adjustment in the picture is the exact opposite and is OK. can't get the change to even vaguely the correct tension if I take it either side of that - new chain and it needs to stretch a touch.

Piccie is with the bike upside down

 

[raleighnut]

You might have to drop a link from the chain as it looks like that's the tightest adjustment possible, I take it that's on the Rohloff and you've not gone over to the dark side (tandem).

 

[SatNavSaysStraightOn]

You might have to drop a link from the chain as it looks like that's the tightest adjustment possible, I take it that's on the Rohloff and you've not gone over to the dark side (tandem).

no wish to look at my OH's backside all day, or surrender all control to him...

yep its a Rohloff hub. I know last time around early on it was similar and once the chain had stretched enough I just removed a link and then when it had stretched some more another link... ... It went around 9,000 mile on that chain, has done very little on this chain (£4.29 chain, so not too worried).

I think there is plenty of room to adjust the chain tension (crank is effectively at 11 o'clock if you rotate the picture), its just that one position that you have to avoid... can't remember which way around it is...

 

[betty swollocks]

Yes; the thicker part of the eccentric should be nearest the adjustment nuts,
As you look at the pic - if you loosen the nuts and wind the eccentric anti-clockwise - i.e. the bb axle gets a little further away from the hub, the chain will become tauter.

 

[srw]

What the others have said. That's Thorn's "crude, but effective" eccentric, isn't it? As I understand it what you're tightening is a nut with a pointy end which pierces the BB shell. You obviously don't want to pierce it where there's a bearing. You can run a Rohloff chain very loose without any materially ill effects - we let our drive chain get to about double Thorn's recommended maximum play before I got around to taking out a link to get it reasonably taut again.

 

[SatNavSaysStraightOn]

What the others have said. That's Thorn's "crude, but effective" eccentric, isn't it? As I understand it what you're tightening is a nut with a pointy end which pierces the BB shell. You obviously don't want to pierce it where there's a bearing. You can run a Rohloff chain very loose without any materially ill effects - we let our drive chain get to about double Thorn's recommended maximum play before I got around to taking out a link to get it reasonably taut again.

we work on the when it falls off if the bike is laid down approach as well.
I'm only doing 400 miles so nothing too major - should be OK and seems I have remembered it correctly... thank you everyone

 

[gwhite]

What the others have said. That's Thorn's "crude, but effective" eccentric, isn't it? As I understand it what you're tightening is a nut with a pointy end which pierces the BB shell. You obviously don't want to pierce it where there's a bearing. You can run a Rohloff chain very loose without any materially ill effects - we let our drive chain get to about double Thorn's recommended maximum play before I got around to taking out a link to get it reasonably taut again.

I've always thought this was a bad system in that the point creates a depression in time.