Type Tridoron having one black arm makes sense. It matches up with Tridoron's front left wheel well being exposed and black in color.

I originally posted a comment saying I didn't like the black arm, but after reading this it makes a lot of sense.

Look too big, waiting to see this type.

It is very red but looking at it with consideration to the theme (ie: a suit version of Tridoron) I do like it. Still need to see it more clearly and with the helmet but my initial impressions are good.

Pretty good explanation. :D

Type Tridoron is basically Shinnosuke wearing Tridoron as a suit. The white is Tridoron's stripes and the black arm is Tridoron's hollow section. To make it even more like Tridoron they should have gave Type Tridoron four wheels.

Unfortunately he only seems to get the super wheel combinations as I am calling them but with the tridoron shift car it has 6 wheels so it almost counts as him getting all 7 wheels.

https://pbs.twimg.com/media/CEyd4tCUMAAP7OQ.jpg
Type Tridoron is nearly visible in this catalog entry! Alongside the Shift Car for Type Next and a key like item for the MachDriver!

Type Tridoron looks so good! Especially the helmet. The only funny thing I can see are those vents on the helmet that almost look like eyebrows. :lol

He's in a constant state of angry eyes XD. Need the Figuart of this now :lol