question for those who ride with a White Industries double crank

[Mark Reimer]

I've been riding with a White Industries VBC crank on my Atlantis since the spring and it's been great, except for one nagging thing. The large ring doesn't seem to be dead straight/flat. If I look down at the chain ring while I am pedalling, I can see it moving from side to side in between the front derailleur. That means it is really hard to trim the front der. and not get any buzzing from the chain scrapping against it. It has to be *JUST* right to not contact.

Now I have some single speed White rings and they are all dead straight. So I'm curious... could it be the cheapo BB I have (It wasn't even 10 bucks. bought it to test the spindle length and decided to ride it till it died. Turns out it's quite tough!), or do White rings have a certain amount of flutter? 

It's about 3mm of total side-to-side movement I'd say.

[Bill Lindsay]

Mine is "pretty darn straight", but I'm using a WI bottom bracket as well.  3mm seems like kind of a lot.  Maybe pull the arms and put them back on 90 degrees different and see if that changes anything.  Maybe you should

##brace yourself for divisive comment##

grease the spindle

##resume normal level of readiness##

[Mark Reimer]

Hah! I'm ready. Great idea about turning it 90 degrees though. I'll give that a shot. While I have it off the bike, I'll try laying the large ring on a granite surface, that should shed some light as well. 

And yes, can never have too much grease. 

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[Shoji Takahashi]

Hi Mark,

Another data point: I've got VBC double on my Hunqapillar, and it's also "pretty darn straight". 

BTW: love the cold-weather pix! Stay warm my friend.

shoji

[Anton Tutter]

You can even try removing the crank and re-seating it (with grease) without rotating. That happened to me with a new Rene Herse crankset, but simply re-seating it on the spindle fixed it.

If it doesn't fix it, try noting the phase of the lateral out-of-round. i.e., where along the 360 degree path is the crank arm when the chainring is the farthest "out".  Then remove and reinstall 180 degrees out of phase. Is the farthest out point of the out-of-round still in the same place relative to the crank arm?  Or is it now 180 out of phase?  If the former, then likely the chainring is bent, and the crank arm is installed perfectly straight. If the latter, the BB is bent.

Anton, who is frequently out of phase with things.