Y'all should know???

[Gula]

So, the feebay has trx4/6 transmissions for cheap imho. So here's my quarry.

Can the transmission be used on non portal axles, or is it geared too high? I think im going to try to use one as 2sp t-case. On a big big truck.

 

[casco_bay_rc]

So, the feebay has trx4/6 transmissions for cheap imho. So here's my quarry.

Can the transmission be used on non portal axles, or is it geared too high? I think im going to try to use one as 2sp t-case. On a big big truck.

The TRX trans has tall gearing, so you’ll need to compensate with your ring and pinions to optimize it for crawling. Or, make it a fast rig "thumbsup"

 

[durok]

Pretty sure someone on the forum has installed the SSD portal delete kit - hopefully they will chime in on their experience... "thumbsup"

 

[OSRC]

It's geared very tall, I've got 2 TRX trans on straight axles.

One is in the TRX4 Speedy build, using SCX10V1 axles, it's geared about the same as an SC truck. FDR is 13.4:1 in first, 5.3:1 in second.

The other is my de-portaled sport. I could get around in low gear with 9/45 gears and running 4.5" tires, but it was still a bit tall. 2nd gear was all but useless. FDR with 9/45 was about 29:1 and 11:1 IIRC. Portals were about 2.3:1,so I've added a 3:1 reduction and a bit bigger pinion to the front of the gearbox to get the gearing back into the stock zone. Now both gears are usable again.

I think if you are planning a big truck, you'd need some additional reduction somewhere (like maybe a Capra t-case?

EDIT: I built up a spreadsheet for calculating TRX4 FDR ratios, glad to run some numbers if you need it.

 

[ferp420]

the wraith 2 speed would have alot better gearing options

on my larger builds i use 2 transmissions usualy a 3 gear up front and a 2 speed 3 gear as a t case
something like that might work with the trx 4 trans also

 

[Gula]

the wraith 2 speed would have alot better gearing options

on my larger builds i use 2 transmissions usualy a 3 gear up front and a 2 speed 3 gear as a t case
something like that might work with the trx 4 trans also

Ya, I think that I'll use it as a 2 speed t-case. Only 35 bucks. I've wasted more on other bs.

 

[smc-93]

Pretty sure someone on the forum has installed the SSD portal delete kit - hopefully they will chime in on their experience... "thumbsup"

Although I can't speak to how tall the stock transmission gearing is,as I've never counted or looked it up, I have installed the SSD portal deletes.
You do get a pretty significant increase in wheel speed by removing the portals. My TRX4 with a 2800kv HH motor could lift a tire if I punched the throttle, sometimes even in low depending on terrain.
They will also result in slightly reduced track width (~4mm per side IIRC) and backwards spinning tires (fine if you switch to a standard rotation motor or reverse the stock motor)

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[Olle P]

With smaller (outer) diameter tires it should work fine.
Replacing the stock wheels with 2.2" racing wheels (~2.5" OD) didn't make my TRX-4 go any faster when using the stock gearing...

 

[smc-93]

With smaller (outer) diameter tires it should work fine.

Replacing the stock wheels with 2.2" racing wheels (~2.5" OD) didn't make my TRX-4 go any faster when using the stock gearing...

Changing the wheel OD won't make any difference except maybe offer more stability. That's more influenced by foam selection and tire OD though.
Increasing your tire OD will increase your top speed (and vice versa) but it's usually not that noticeable unless you make a big change.

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[Thorsteenster]

I've wasted more on other bs.

Whew, story of my life brother :lmao:
Glad to see you still around and active :mrgreen:

 

[Olle P]

Changing the wheel OD won't make any difference ...

Reeeeally?

With half the wheel radius the effective gearing (as in travel distance per motor revolution) is also halved.

 

[smc-93]

Reeeeally?

With half the wheel radius the effective gearing (as in travel distance per motor revolution) is also halved.

I was talking about wheel OD not effecting speed. Tire OD will.

A 4.75 tire on a 1.55 wheel will give you the same effective gear ratio as a 4.75 tire on a 2.2 wheel.

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[Olle P]

I was talking about wheel OD not effecting speed. Tire OD will. ...

That's semantics and a definition of words.

Wheel = Tire and Rim.
So wheel OD = Tire OD
Tire ID = Rim OD.

 

[smc-93]

That's semantics and a definition of words.



Wheel = Tire and Rim.

So wheel OD = Tire OD

Tire ID = Rim OD.

I agree with you, partially. It is a matter of semantics and growing up around different uses of words.
That being said, neither I nor anybody I know (personally) has ever referred to the tire+wheel combo as a wheel. The tire mounts to the wheel. The wheel mounts to the vehicle.
I've only ever heard "rim" used as a slang term for a wheel or occasionally slang for aftermarket wheels.
By the definitions I used to make the statement I did, Tire ID would be equal to Wheel/Rim OD. Tire OD, being a separate piece of the whole assembly, would have it's own separate measurement.

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[ferp420]

I agree with you, partially. It is a matter of semantics and growing up around different uses of words.
That being said, neither I nor anybody I know (personally) has ever referred to the tire+wheel combo as a wheel. The tire mounts to the wheel. The wheel mounts to the vehicle.
I've only ever heard "rim" used as a slang term for a wheel or occasionally slang for aftermarket wheels.
By the definitions I used to make the statement I did, Tire ID would be equal to Wheel/Rim OD. Tire OD, being a separate piece of the whole assembly, would have it's own separate measurement.

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a wheel is any thing thats round used to move something a wagon wheel would be a good exsample a rim is 1 part of the wheel a tire would be another part of the wheel

but in car world a wheel is considered the same as a rim

unless your talking about the wheels like the wheels on the bus go round or my wheel fell off

but if talking about a set of wheels that would be the same as a set of rims

but dose it really matter

basicly a tire is or could be a wheel but

a rim is also or could also be a wheel

and a wheel could be ether a rim and or a tire but it CANT be a wheel under any circumstance ?

 

[smc-93]

"a wheel is any thing thats round used to move something"

If you want to oversimplify it that far, sure.

"but dose it really matter"

No. It really doesn't. I'm sure we've all got better things to worry about.

In the end whether you single out the tire, refer to the wheel and tyre combo as "the wheel", or you call your wheel+tire Kevin, none of that is important.
The important information is that changing the Kevin's outer diameter changes the wheels relationship to the ground resulting in a different overall speed. Regardless of what's going on in the center of the tire.

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[ferp420]

If you want to oversimplify it that far, sure.


No. It really doesn't. I'm sure we've all got better things to worry about.

In the end whether you single out the tire, refer to the wheel and tyre combo as "the wheel", or you call your wheel+tire Kevin, none of that is important.
The important information is that changing the Kevin's outer diameter changes the wheels relationship to the ground resulting in a different overall speed. Regardless of what's going on in the center of the tire.

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so do you have a name for each tire or just the combo

 

[ferp420]

dose the name change when the combo changes like one wheel and tire combo called kevin maybe change the tires dose the name change to sherly

 

[Goro Majima]

I agree with you, partially. It is a matter of semantics and growing up around different uses of words.
That being said, neither I nor anybody I know (personally) has ever referred to the tire+wheel combo as a wheel. The tire mounts to the wheel. The wheel mounts to the vehicle.
I've only ever heard "rim" used as a slang term for a wheel or occasionally slang for aftermarket wheels.
By the definitions I used to make the statement I did, Tire ID would be equal to Wheel/Rim OD. Tire OD, being a separate piece of the whole assembly, would have it's own separate measurement.

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All of this.

When I was a kid I referred to wheels as rims. I was always into cars but when I started learning more, proper terminology became important especially when becoming a big fan of quality wheels in the car world.

 

[ferp420]

cave man invented the wheel the rim came much later