PDA

View Full Version : Idler - pulley or sprocket?



adrian
10-08-2010, 02:38 PM
My plans call for a pair of idler wheels on the tension side of the chain. I've found local suppliers but the pulley wheels are (a) heavy and (b) expensive. This sprocket:

http://www.princessauto.com/driveline/drive-sprocket/components/8069932-17-tooth-idler-sprocket

looks like it would be better solution on both fronts. I'm working on the assumption that #40 chain is the same as bike chain, and I suppose there could be width issues (but that should be easy to rectify). Is there anything I'm missing here? Why the widespread use of pulley wheels?

Cheers,
-Adrian

PeterT
10-08-2010, 06:03 PM
Adrian,

You can use anything that allows the chain to slide freely over it: old scooterwheels filed to shape; A piece of thin poly pipe resting secured to a bolt with the chain running through the inside of the pipe; a block of nylon freely rolling on a bolt; a hacked coaster brake, with the pawls removed; a sprocket mounted to a bearing; etc etc

PeterT