samsavvas
100 W
Hi Folks,
Trying to improve my hub-motor-based mid-drive and am experimenting with a bit of chain management. Can anyone point me to a 2-pulley hair tensioner that works in reverse? That is, it pulls from the front at the top pulley and from the rear at the lower one. If you are trying to visualise this, it means that the rotating tensioner arm on which the 2 pulleys are located will be trying to turn anti-clockwise. I need it to assist a rear derailleur to maintain return-chain tension on a long bike and to help place the return chain below bike frame cross-members (it's on a Big Dummy).
I am thinking something made of plate like the Problem Solvers design, but rotating 'backwards'. I know I could use a regular chain tensioner like the Alfine of even just an old derailleur mounted backwards, but I'd really like the bolt-on bits and the arm to be on the distal or outside of the bike if possible.
Any ideas? Anyone know of a thread or previous post on buying or even making one?
Thanks,
Sam.
Trying to improve my hub-motor-based mid-drive and am experimenting with a bit of chain management. Can anyone point me to a 2-pulley hair tensioner that works in reverse? That is, it pulls from the front at the top pulley and from the rear at the lower one. If you are trying to visualise this, it means that the rotating tensioner arm on which the 2 pulleys are located will be trying to turn anti-clockwise. I need it to assist a rear derailleur to maintain return-chain tension on a long bike and to help place the return chain below bike frame cross-members (it's on a Big Dummy).
I am thinking something made of plate like the Problem Solvers design, but rotating 'backwards'. I know I could use a regular chain tensioner like the Alfine of even just an old derailleur mounted backwards, but I'd really like the bolt-on bits and the arm to be on the distal or outside of the bike if possible.
Any ideas? Anyone know of a thread or previous post on buying or even making one?
Thanks,
Sam.