Sorry-last dumb question for a while
 

Sorry i;ve been asking a lot of dumb questions lately, i promise this is my last one for a while.

After examining my ride more closely, a can see my chainline is clearly out of whack--i dont know how this can be--I've got formula hubs on my otherwsie stock bianchi pista--the measurement match up, so i dont know whats wrong--the cog is too far out. Here comes the dumb question--there looks like there is a small ring between the cog and the edge of the hub where the threading starts--i had some guy at an lbs install the cog and lockring so i dont know if he used a spacer---is this a spacer? I mean, cogs are flat--they don't have a cyclindrical ring on one side, right? I know this is a dumb question but there is only 1 lbs w/ mechanics that really knows about track bikes up here and they are booked this weekend for repairs. If its just a spacer i'll have the dude that installed it just take it off--otherwise i have to drive 30 mi to (Sk)Appleton to an lbs who knows about track bikes.

pics?

my formula hubs have nothing between the actual hub and the cog.

pull that ***** out

no camera phone or digital cam--sorry---all money spent on bike & new wheels

Let me try and explain better--looking at the hubfrom inside out--there is the surface that extends from the flange right before the threading. Next to that surface is what appears to be a ring next to the cog so looking at the back of the wheel from lef tot right i see--hub surface--ring--cog--

sounds like a spacer to me, take it off.

i see the same thing on the stock binahci wheelsetthat came with the bike


if only i had a chainwhiwp or lockring tool



why would the lbs dud put a spacer on? granted i just brought in the back wheel to have him install the cog and lockring but still-=-is that like standard practice or something?

I'm leaving for Madison in about half an hour...I'll bring my chainwhip if you want.

If there was a spacer on the hub, how would your lockring thread on completely?

good point

Some cogs do have a "flange" on one side which could be mistaken for a spacer..
I will try to find mine and take a picture.

Does it look similar to this?
http://zackuribe.com/DA14T.jpg

That is standard on DA cogs..

yes--thanks dude--that helps--that is what i am looking at

ok--still dontk now why chainlinei s messed up

If you're using a road crank, is your front chainring mounted on the correct side?

the side that says shimano is facing out

Outside or inside of the crank spider? Where's the ring fastened to the crank?

its on the inside-

I didnt have this problem wuith the stock wheel set--also i just noticed that there is a group of links in the chain stick out farther to one side

is it suppossed ot be on the outside?

....?

I know there are variations for every hub / cog combination. Sheldons' Dictionary / Chainline will give you all sorts of figures for you to pour (pore?) over while you ter to find the problem.

I have Sugino RD in 3/32, Campy Record hub with 1/8 and the line is off by maybe 1-2mm, due, I believe, to the fact that there's a difference in spec between the components. The BB is "correct" according to all sources.

Frustrating, isn't it? On paper it's supposed to work. Indeed, it does, but imperfections are seen nonetheless.

yeah i see w/ a 1/8 DA cog ona forumla hub you dont get a perfect 42mm chainline

would moving the chainring to the outside of the spider help?

time for you to actually *measure* what the chainline is in the front and back....

moving the ring to the outside of the spider will move it 5mm. Is that too much?

maybe i just need a new chain. at some point the line seems straith--at others its off--part of the chain seem to bulge in one direction---i just noticed teh chain "hopp" the back cog

MEASURE it!!!!!

The cog has a shoulder which butts against the flange.
If your chainline is off, what kind of crank are you using?

i've got the stock sugino RD cranks that came with my pista

If the bike is stock aside from the new wheel, the ring should be on the outside of the spider and you shouldn't have any problems. Have you considered that maybe the drive-side crank isn't entirely on the spindle?