Chainline Question

So I finally got around to putting the fixed cog on my flipflop wheel. The chainline is off by quite a way. The chainring is maybe 1cm further out (right from above) than the cog. I can't really get a shorter BB as it is already pretty tight in.

So I assume I need to respace the wheel to move the cog further out. Is this correct? And if so, how do I go about it? Do I need to do what is described here http://www.63xc.com/dennb/redish.htm ?

Advice appreciated in advance.

Cone spanners, a little time, and your there...

I'm actually slightly confused by the link. Am I correct in thinking that that you have a 'proper' track hub, or a converted road/mtb hub?

...If it's flip flop then yes.

You'll need to get some spacers to put between the cones on the drive side of you hub. That way the cog will...........

AAARRRGHHHH. I'm talking absolute bollox. If the chainring is as far in as it can be and the chainline is still on the wrong side of the rear driveside drop out then something is wrong...

Is the ring on the inside of the spider?

actually, that wont make a 1 cm difference

The link was me second guessing what I had to do. Picture coming in 2 mins

Terrible pictures but...

http://img5.imageshack.us/img5/3190/img2217h.jpg

http://img10.imageshack.us/img10/4636/img2212e.jpg

Ok. That doesn't seem too horrendous.

The problem you have is that the chainset/cranks were originally from a road bike and hance have those protruding parts inside which are called shoulders and hold the inner chainring on. Generally you'll not be able to fit these to track framses, but your obviously isn't

Two options;

1. Angle grind the shoulders down. This is fairly common, but does render the cranks virtually unsellable if you ever do decide to do such a thing.

2. But a proper pista/track crankset which won't have this issue.

Eitherway you'll need to re-build the BB with a slightly smaller axle I think, but not sure on that.

I've had this problem myself and can get extremely frustrating. You know your options and I think you know hich is the easiest...

Oh man, that sounds either;

1. Like an awful lot of hassle.
   
2. Like a huge expense.
   
   

Deliberation of which seems best will now ensue...

What kind of hub is it? I cant see a lockring and its got a lot of space to the dropouts.

Using some measuring calipers work out how much you need things to shift. You may need a combination of a shorter BB, and to space/dish the wheel because the chainline is way out.

In case you've not yet discovered... Sheldon Brown's pages on dishing a wheel are great.

I'm well confused by all this... If you have a flipflop wheel when flipping it Round to the fixed side the chainline should be the same. If not a proper 120mm fixed hub if you respace frMs and put a 120mm hub would improve chainline.

Not sure what hub it is. Unbranded black generic looking thing. Looks like it might of been from a stock wheel set but I'm not sure. Its laced onto Alexrims which come as stock on a Langster maybe?

I'm well confused by all this... If you have a flipflop wheel when flipping it Round to the fixed side the chainline should be the same. If not a proper 120mm fixed hub if you respace frMs and put a 120mm hub would improve chainline.

That is what I thought would happen. But looking at it with both cogs on, the fixed cog is closer into the wheel by a fair margin, 5mm at least I would very roughly guess (becuase I can't find my ruler) than the freewheel.

I think i was in the same situation coming from a roadbike that has been converted to ss/fg
My hub spacing was 130mm but it needed to be 120mm for the hubs i was getting so the lovely people at my bike shopcorrected it for me by basically crushing my dropouts, seems fine now though.

Maybe this is irrelevant though, hope it helps anyway

Yeah, mine is a conversion too. However, I am not sure if this would help because the cog needs to move out, away from the wheel. I would imagine making the spacing smaller would just move it left which is effectively closer into the wheel...

if the spacing on your wheel is the same on both sides (locknut to flange) then maybe make sure sprocket is screwed on the right way as some sprockets are dished. Always make sure the frame is the perfect width for the hub. I do single speed conversions at work all the time and always ways to make it work.

Later when I can find my ruler I think I will measure my wheel and my frame spacing. Will report back then.

worst comes to the worst just take it to any shop and they will fix it up i'm sure,
good luck in any case

The chainline on my OTP Fuji is practically a zig-zag when viewed from behind.

I'm waiting on Jimbilly to provide me with a new sprocket and chain to see if that will sort it.

You can remove the shoulders on the back of the cranks using a normal hand file. Should only cost a quid or two for one of them.

The chainline on my OTP Fuji is practically a zig-zag when viewed from behind.

I'm waiting on Jimbilly to provide me with a new sprocket and chain to see if that will sort it.

Are you running the stock chainring? If not, that may be the problem. Those stock RPM chainrings are weird and shift the chain towards the frame.

...or your frame's bent.

You can remove the shoulders on the back of the cranks using a normal hand file. Should only cost a quid or two for one of them.

+1

Do your nails while your at it.

;-)

Do your nails while your at it.

;-)

Thanks for the grooming tip :).

Still cant find my ruler but meh.

My friend came round who has built a couple of fixed gear bikes before and was stumped. Really not sure what's up. Cant get a much shorter BB in there,

Going to hit up a bike shop and ask. Will report back for future reference when I get round to it. Single speed for me in the meantime...

Thanks for advice so far though.

Are you running the stock chainring? If not, that may be the problem. Those stock RPM chainrings are weird and shift the chain towards the frame.

...or your frame's bent.

Had the frame checked by the billy of the hills and it's straight.

FSA Carbon Track Pro cranksets are from the factory bent?

Could you provide some backup before I take it to the man?