Optima Mid Racer Build

[mikea96]

So I have decided to build a Optima Mid racer with a big thanks to Jake for the custom chassis, suspension arms and tranny top shaft. Im just waiting on a belt to get started on this.

[rccars4sal]

Wowsers! Going with lazer length arms? I think with all the opt mid racer builds, we should have a get together,, and RACE THEM! Im ready with my lwb blue blinger.

[mikea96]

There custom lengths for running ZX5 hubs and wheels.

[Coelacanth]

There custom lengths for running ZX5 hubs and wheels.

How much longer, exactly, are Lazer arms to the Mid arms, from hinge pin hole to hinge pin hole? With both Barney & OptiMutt, I'm running GPM alloy arms that are 5mm longer than stock, and 68mm CVDs work perfectly. Just wondering.

[Seabass]

These arms are exact measurements of the Lazer ZX arms.

The front arms with ZX5 c hubs and steering arms need the 73mm swing shaft. The rear uses ZX5 rear carriers and 62.5mm swing shafts.

Mike even though I am biased, those parts do look good and will give you one heck of a race car. Looking forward to more pictures.

Jake

[isobarik]

when using zx5 c hubs LA-219-4/7/9

65.5 in the front and 62.5 in the rear.

LA-232 front and UM-510 bone and La 231-02 axle in the rear.

Are those arms machined ????

the 73mm unis are for the sp aka losi style front suspension

mvh Isobarik

[Coelacanth]

These arms are exact measurements of the Lazer ZX arms.

The front arms with ZX5 c hubs and steering arms need the 73mm swing shaft. The rear uses ZX5 rear carriers and 62.5mm swing shafts.

That would make perfect sense for the rears, then. So the rear arms are basically the same general specs as Optima/Optima Mid arms, which require 62.5mm swing shafts. They look longer but that's probably because the rear hubs for the Lazer ZX5 have far less offset.

[mikea96]

Yes the arms are machined nylon

[Bormac]

This IS what this community is all about. Like minded enthusiasts helping other like minded enthusiasts. Jake's work never ceases to amaze and excite me and these items are stunning!

[Seabass]

when using zx5 c hubs LA-219-4/7/9

65.5 in the front and 62.5 in the rear.

LA-232 front and UM-510 bone and La 231-02 axle in the rear.

Are those arms machined ????

the 73mm unis are for the sp aka losi style front suspension

When I built my car I actually purchased the 65.5 unis initially to find out they were too short for the setup I was running. I was able to get the 73mm to fit perfect without throwing the wheelbase out of whack.

[isobarik]

if you are using the c hubs from the mid on the lazer arms the 65.5 unis will be to short but then again it will also be to wide to race with.

65.5 unis and lazer arms and zx5 c-hubs la-219-7 there is now way jose they are to short i use them myself.

the 73 mm unis are for the zx-5 sp / sp2 since they have copied losis setup i think the axle itself should be to short for the zx-5 hubs la 219-4/7/9

mvh Isobarik

[DennisM]

If it´s for racing purpose, I don´t get the idea of using nylon arms over the fibre reinforced plastic original lazer arms?
I agree it looks sweet, but a downgrade from the originals if You want to race the thing

[isobarik]

If it´s for racing purpose, I don´t get the idea of using nylon arms over the fibre reinforced plastic original lazer arms?
I agree it looks sweet, but a downgrade from the originals if You want to race the thing

yes but you said it youre self they look SWEET..

mvh isobarik

[Coelacanth]

For me, appearance is important, but not at the expense of durability or strength. I know for many racers, light weight is the priority, as you can tell by looking at all the cheese-grater RC10 pans that you could probably twist up between your hands, but I'm sure racers crash a lot less often than I would.

[Bormac]

Marc I remember my racing days back in the 80's when our cars were powered by the old 1200sc batteries. Compared to what's around now days these batteries didn't afford a lot of run time. The more current you pulled the higher the chance would be that we'd 'dump' before the end of the race. The challenge used to be to find ways to make duration with stuff like gearing and getting your car down to minimum weight.
For many people it meant drilling out chassis components. In my opinion this only weakened the cars.

Also keep in mind the tracks back then were very different from today's mini motocross designs. Most of the tracks in my region were almost flat with a few bumps thrown in.