Do Q-Rings work for Single Speed or Downhill use?
The 34t or 38t will work without the need for a tensioning device, but here are a few things you should note: If using the 38t DH ring on a DH bike, you will have to use a chain guide such as the MRP System 1 (World Cup 36t-40t model) http://www.mrpbike.com/product-system1.php, in order to avoid the chain from falling off. If using either the 34t or 38t on a single speed bike, position the crank between 3 & 4 o’clock (largest part of the Q-Rings will facing up) and then tighten the chain the same as you would on a round ring. Because the effective tooth size is a gradual change, and not that extreme, you will be able to ride in tough terrain without the chain failing on you. You will obviously have a small change in tension if you’re feet are at 12 & 6 o’clock, but when going downhill you’re feet will likely be positioned at 3 & 9 o’clock (highest tension). Therefore, the only time you’ll be at 6 & 12 o’clock is when you are pedaling, which means that you will be applying pressure on t
