Originally Posted by kaptondave
That depends on where you buy the CF. I got mine from Goodwindsn p/n 020975. The weight is almost identical to the stock Radian spar but it is much stiffer.
I looked at the specs on the Goodwinds rod and they are the same as my CST rod. .375 OD, and .290 ID. The weight as quoted for 32.5 inches is 34.3 grams. Once cut down to size, it should weigh the same as the CST rod, somewhere around 28 or 29 grams. The stock spar weighs 21 grams. This is all speculation on my part, because I don't have a Goodwinds rod to weigh. Do these numbers agree with what you see?
Obviously, you can't go wrong with either option. It amounts to a weight gain for a Radian and a weight saving for a RP. A thinner-walled tube would be a better choice if you wanted to keep the Radian as light as possible.