gschreckchat@comcast.net
I had a similar problem, and had the BB shell faced, and the problem go much better. Also, the standard mego exo bearings are not very good, hence the push for ceramic. The new mego exo or other versions (Shimano et. al.) will usually spin less well than an internal BB. Remove the chain from the rings on both types of bikes, and spin the cranks. You will see a difference. After I put in ceramic bearings in the maga exo crank (after facing first), they became similar in spin. Gets expensive though.
I think the real answer is train harder, but it is more fun to buy stuff.
--
George Schreck
gschreckchat@comcast.net
(503) 502-0425
-------------- Original message --------------
From: "Erik Voldengen"
I also noticed that when I got a bike with FSA MegaExo cranks/BB.
The good people at Bike-N-Hike fixed it for me, so I don?t know what the issue was. But I?ve since dealt with a lot of external bearing BBs from FSA, Shimano, SRAM, and Truvativ. It?s pretty clear to me that when using an external bearing BB, it?s even more important to have your frame?s BB cups faced. If your frame?s BB faces are not perfectly aligned, I believe it?s quite likely you?ll noticed increased resistance when backpedaling.
If I had to guess, that?s probably the solution to your problem. But I?m not a professional mechanic, so maybe someone else will chime in with another explanation.
-Erik
From: obra-bounces@list.obra.org [mailto:obra-bounces@list.obra.org] On Behalf Of Ryan Van Dusen
Sent: Saturday, April 21, 2007 8:48 PM
To: obra@list.obra.org
Subject: [OBRA Chat] Resistance in brand new FSA drivetrain?
I'm hoping someone out there might be able to help me out here. I got my first 'real' bike and it has a FSA Carbon Pro Team Issue MegaExo crankset w/Integrated spindle drivetrain. After today's ride I was cleaning it up on the stand and while spinning the cranks by hand I noticed a lot of resistance in a few key spots. It's always in the same spot (4 o'clock through 6 o'clock on the right) and I can't seem to figure out what is causing this outside of some bearing issue. A quick Google search didn't yield anything real useful outside of replacing my bb bearings with ceramic bearings. Does anyone know if this is just from the drive train being so new? I've never seen anything like this in my short career.
Forgive me if I left out any details that might help. Any information is appreciated I'm hoping this issue might explain my poor performance this morning....
Ryan