Joined: Feb 2006
Posts: 12,286
Likes: 317
From: Lake Geneva, WI
Bikes: Ridley Helium SLX, Canyon Endurance SL, De Rosa Professional, Eddy Merckx Corsa Extra, Schwinn Paramount (1 painted, 1 chrome), Peugeot PX10, Serotta Nova X, Simoncini Cyclocross Special, Raleigh Roker, Pedal Force CG2 and CX2
Originally Posted by
AzTallRider
Barrett - Do you know whether there is a difference in friction/performance when there is enough side-flex to cause some noise?
Noise is an indication of increased chain wear. It can have several causes. If the bike is a double and has the same chainline as the OEM specification, chances are that the noise is the product of road grit that has mixed with the lubricant.
When riding normally and avoiding cross-chaining, dirt can fill the open tolerances in a sideflex chain. These open tolerances are in the pin and roller fit and in the side plates. Then when the chain is flexed, the dirt reduces the available range of motion. This can cause some noise. The dirt will increase wear, but the chain is not suddenly damaged.
There will always be some dirt and grit in a bicycle chain. Only if the bike is used indoors or at a dry and dust-free velodrome is the issue of chain wear from dirt and grime avoided.
I don't know if a cross-chaining increases mechanical loses in power transmission efficiency compared to a straight chain. Just as an elevator cable transmit power, a bike chain can side flex and continue to deliver full power. Bicycle chain is about 97% efficient. The loss in efficiency comes from friction between the pin and barrel and at the side plates. The loss occurs when the chain travels over the sprockets, cogs and pulleys.
__________________
When I ride my bike I feel free and happy and strong. I'm liberated from the usual nonsense of day to day life. Solid, dependable, silent, my bike is my horse, my fighter jet, my island, my friend. Together we will conquer that hill and thereafter the world.
Last edited by Barrettscv; 06-14-12 at 08:36 AM.