you also need to consider whether your frame will be a limiter
and whether the crankset will limit how far inward you can move your cleats.

Like it is possible you get Crankset A with 5mm lower Q-Facts but the arms interfere with the shoe 5mm sooner

Or shoe starts hitting chain stay

You may also be able to artificially reduce Q-Factor by using an FSA BB on non FSA crank, or leaving the drive side washer off the FSA crank, but then you may need custom shaved chainring bolts to stop the crank from hitting the frame

good luck!

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Kat Hunter reports on the San Dimas Stage Race from inside the GC winning team
Aeroweenie.com -Compendium of Aero Data and Knowledge
Freelance sports & outdoors writer Kathryn Hunter

.
was interested to know of actual brands or models
of lower q-factor crank sets

is fsa the lowest q-factor bb386 ?

Agreed, I was able to get a lower stance width with a curved sram arm than a straight rotor one, despite the sram having a 2mm increase in Q-factor.

.
so rotor bb386 is known for having wider q-factor ?

I have no idea what bb386 is, I have only ever had bb30 and giants bb86, too many BBs!
But generally cannondale Si/sl seems to have the lowest, then campag, then rotor/sram/shimano seem to be about the same.

.
my bb30 cranks won't fit on this new frame the shop has built up.
they say i have to have a bb386 / bbright crank.
and they explained bb386 is wider.

i had been trying to buy hollowgram cranks for this frame.
and i would have learned the hard way.
hollowgram will not fit.

so i have to ask here for help
since bikes and part compatibility have changed so much over the years

A bbPentium?

can you tell me what bb pentium is ?

A bbPentium?[/quote]

[/quote]
A really, really bad joke.