The skinny wheels are the very old style wheels that were used on the Losi XX and models of that generation...
Models since the B4, have used a wider wheel, which is now standard width in 2wd. This is due to the popularity of wide ribs in the ol USA.
I would use a std width b4 wheel with inserts IMO. I know Sleigh said he ran 4wd front inserts in his!!
Hope this helps Lee.
