Gates Tension and Alignment Challenges !
I'm new on the list, and have read a lot!
I'm trying to update our 2009 Cdale. Co-Motion has/had a sale to close out the Gates CDC system. I thought, "what the heck" and purchased. Now I am having some difficulties with install...of course I'm hoping someone will set me straight.
FSA Gossamar cranks
FSA MegaExo BB.
Cannondale dual-wedge ECC
First question: I am using the iPhone app for tension. I tested with the cranks in various positions to see what the range is and expect some differential in tension. I am getting a 15hz variation i.e 50hz in one position vs. 65 in another. That seems significant to me especially since the Gates App indicates a 5hz variation between "lightweight" and "big and powerful" for tandems.
I have repositioned the front pulley on the spider to see if it changed, it didn't have a noticeable impact.
What kind of hz ranges are others getting with this App?
Second question: Alignment. If I can rotate the cranks forward and backwards without the belt walking off, is that considered aligned? I believe I can hear the belt rubbing against the flange of the pulley but I currently have the system "aligned" such that the belt will not walk off while on the stand but have not ridden it.
I ask this question after investing a significant amount of time trying to attain alignment. I am using the ECC to attain aligment though I do have some option with shims. Once I get the alignment set I have to rotate (using a pin spanner) the ECC for tension, the ECC "walks" in the BB which throws off the alignment. If I'm lucky and get the tension acceptable (see above) and the alignment is still good, I have the challenge of tightening the ECC which again may cause the alignment to shift ever so slightly...and the belt will wander.
Am I the only one pulling my hair out? - technically not my 3rd question...
Any insight appreciated!