The 5-arm 130mm BCD spider is compatible with serious road chainrings. 84 grams, still less than 3 ounces.
Now you can trim weight from your bike with alternatives to heavier steel chainring discs, by using your favorite chainring and a new lightweight spider that mates to our freewheels.
The spiders are made from AL 6061-T6, an "aircraft" grade aluminum alloy with high tensile and yield strength and superior resistance to corrosion. At 4.8mm thick they are strong and resilient yet still save well over half the weight of an equivalent size steel chainring disc. They fit onto our flanged crankset freewheels and our chainring adapters.
For some builds you are going to want that steel disc, but for many setups the steel is overkill.
We are making them available in the most common sizes for all styles of cycling.
Posted by Frank on 05 16 2020
Set up with 52T(steel -1/8") and 50T(alum, 8spd) chain rings that I had so I can pedal with the motor without it slowing down too much. You can go as high as 56T if you want for even a slower pedal speed!!
Posted by Fernando Vazquez on 02 15 2013
Very well made part, planing to use a 48 and a 39 chain ring, I have had experience with using aluminum dampers on my Chevy v8 and had good improvements in RPM I hop it will do the same for my bike motor, all keep you posted.