Hi,
We raced allot of years with :
pitshumizu 25°
blue JB inserts (medium or thin)
proline velocity rims 24mm
Now we race with :
sorex 28
JB medium power stripe (yellow-bue-yellow)three colours
proline velocity rims 24mm
Euhm, i find that the sorex 28 loose his grip afther 3-4min.Maybe they come to hot or dont use the good additive(i use jack the gripper).The pitshumizu are on this moment n1 for me!