Coupla Q RE: Chainline, BB spacers, etc....

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As prep for the Death Ride I moved my FSA Compact crankset over to my
primary bike (Campy 10). Afterdoing so, I noted that I no longer had
access to the eighth cog when in the small ring on the front due to

the

Quoted message said:

chain rubbing on the inside of the big ring in the front.

This doesn't seem right as the smaller rings mean a slightly less
angled chain (distance from cogset to crank rings is slightly

greater).

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Does the chainline for the FSA Energy compact differ from that for

the

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Campy Record?

Same chainline and remember the difference between the 50t and 34t.
BUT, this is a non-issue that requires no correction. You will affect
the front der shifting and the chainline, that should have a line
between the chainrings centered on the middle of the cogset, this line
parallel to the top tube.

It is NOT a problem requiring spacers. A look at a gear chart will show
that if you are in the small ring and 8th cog down, big ring and 2-3
cogs bigger(center of thd cogset-ish) will be the same ratio. Ya got
lever mounted, easy to use shifters, I suggest ya use 'em.

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I obtained some bb spacers (1, 1.5, and 2 mm) from Loose Screws to

try

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to remedy this situation. Upon looking at them,however,I am just a
little concerned.

The radial width (not edge on, but rather the face-on width of the
"torus"😉 is fairly small. Certainly not the thickness of my bb

shell,

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maybe half. Is this ok? I would think having the outer half of the
lip of the drive side BB cup unsupported would be less stable than

full

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contact as without the spacer. Possibly unacceptably so?

TIA

App

Hey, Peter -

Accepting your response about not needing the spacers - can you (or
anyone) address my second question re the spacers themselves?

Thanks,

App

email hidden said:

Hey, Peter -

Accepting your response about not needing the spacers - can you (or
anyone) address my second question re the spacers themselves?

Two observations...

First, the spacers I've received from LS were the same OD as the
flange on a Shimano UN53 BB, so unless they've changed the dimensions,
the face width should be OK. Numbers would make this easier to
evaluate than invisible comparisons.

Second, beware of trying to shim a BB. It sometimes has side issues.
Not all left cups or bushings will go deep enough into the BB shell to
allow the BB to be shimmed to the right very much; not at all in some
cases. Also, if the left crank's clearance with the chainstay is very
close, spacing the BB rightward may result in a collision there.
*Usually* there's enough room that this is a non-issue, but it's still
wise to check.

That said, I've done it a couple of times in instances where it would
work, and had no problems from it.
--
Typoes are a feature, not a bug.
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Rack:

HAD Q RE SPACERS PURCHASED:

The width of the torus is about 1 -1.5 mm. Doesn't seem right. The
text on the web page said "freewheel/BB spacers". Did I get the wrong
ones? Link to purchased spacers:

http://www.loosescrews.com/index.cgi?c=Bottom%20Bracket&sc=Cup%20Spacers&id=73849096983

ALSO WORRIED ABOUT AMOUNT OF CUP THREADS:

The FSA BB DS cup goes in at least 1.5" or so - I can't imagine having
issues with that. Additionally, there is about 1 mm of exposed ND side
cup.

ADDITIONALLY MENTIONED LEFT CRANKARM CLEARANCE:

There is plenty of crankarm clearance on the left - looks like about
1.5 cm or so - and I was only gonna bump the crankset over 1 - 2 mm.
Not a great deal, but it allows me access to the same number of cogs as
my Record crankset before the chain hits the big ring.

Thanks, Werehatrack. BTW, what are the environmental conditions that
turn you from a mere mortal to a supporting device for a chapeau?

App