Which BB Help

Ok so I'm about to buy a dura ace track chainset and I need some advice on the best BB to keep a perfect chain line..
The rear spacing is 120mm on an old holdsworth with english thread.
Is there a 'idiots' way of working out what size BB is required..?

the idiots way is to buy 2 dozen different lengths and keep swapping them in and out 'till you get it right.

hopefully you'll get a sensible answer soon from someone who knows better

http://www.lfgss.com/thread3372.html

The idiots way is to use anything other than a DuraAce BB. Get DuraAce hubs and a DuraAce sprocket too. They are all made to work together, surprisingly. Oh, and since everybody else has managed to resist so far, UTFS!

I would say that you need a 109mm BB to get the right chainline

He hasn't told us which DuraAce chainset (square or Octalink) or the hubs and sprocket he's using, so any advice at this stage will be wild speculation

ahh yes. Sorry, I thought I read he had DA hubs too

Hmmm, hubs.. It's a system x hub with a dura ace fixed sprocket.
The cranks are the dura ace that Hilary stone is selling on the sale pages.

Jokes - I've been having the same issue....

The idiots way is to use anything other than a DuraAce BB. ....UTFS!

Only if you're using the Octalink, bc a square taper BB does not seem to exist!

If you're using square taper it needs to be ISO and 108.5 or 109 or 109.5 depending where you read.

RE: Octalink vs square taper - I'd go for the Octalink version just bc finding an appropriate sealed square taper seems to be a bit of a mission. Phill Wood have BB's that work bc they have adjustable cups.

WTF is UTFS!..?

Use the search. But in a mean way.

Hover your mouse cursor over UTFS and all will be revealed. As it will with BB and NJS. Not sure about ISO or JIS though.

UTFS...ah understood now...
Mr Tester...YCFRO...

Easy tiger. Its a forum welcome. Took me a year to get it though. ;)

Of course, if your next question is "Can I ride brakeless with only a freewhell?"....expect some more heat.

Actually, if you read between the lines, mdcc_tester was actually being helpful - though with the spice of some sarcasm.

Easy tiger..yes..nerves..new lingo...I'm only messin about anywayz..this place is always helpful and I'm lovin some of the dialogue and jokes...

WTF is UTFS!..?

hehe.