I am looking to get my first rack for longer rappels (my petzl stop bottoms out at about 100M). I am planning on using onrope1's "build your own rack" option
http://onrope1.com/store/index.php?p=pr ... &parent=14
I'm thinking about getting either an 18 or 24 inch with 6 bars. Now, I'm curious to know which style of brake bars is better for longer rappels, the tubular style or the U shaped ones. To me, it seems the tubular shaped ones would ABSORB more heat, while the U bars wouldn't as much because they have more surface area to dissipate off. Please respond with any insight and help me understand! Thanks in advance.