I have raced the TRF511 this summer and there is no problem with the front 950 ball bearings. (TRF511 has the WO universals)
I have raced it on bumpy tracks and on tracks with big jumps.
BTW, the new suspension arms (high traction) are stronger than i thought. I´ve anly broken one front arm and that was when I hit a steel pole at full speed.
The new drive belts (reinforced) are ace. I´ve ran more than 70 batterys without changing the drive belts or pulleys.
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