The DB01R comes with the 54141 and 54142 high traction arms. There are "only" 3 types of arms. So Dave, youīre right. It is consistency issue between batches.
They are not good for "bashing", but works for racing. Team drivers used them at the euros. Seemed to work just fine.
I used them last season on my 511 and they worked fine as long as I didīnt smash into things...
When you run into things the thin material of course snaps of easier than the thicker arms.
Those who have tested the db01 arms for racing says that they are to soft. I havenīt tested them yet.
Migs, I think your are right. The high traction arms should be lighter than the others. They have less material and therefore allow also more flex than the 501X arms.
EDIT!
A high traction front arm weigh 8,8 grams. A TRF501X front arm weigh 12,6 grams. Thats 43% more...
A DB01 arms weigh 12,8 grams.
Rear high traction arm weigh 9,8 grams and DB01 rear arm 12,4 grams. Thats 26% more.
I have some pics of the arms at the bottom of this page:
http://www.tamiyaclub.com/showroom_m...87535&id=13377