Xv-01 rear knuckle mystery

[DuntmatterReally 0]

Hi all,

I was hoping to replace the standard rear knuckles on my XV-01, but am stumped! Any advice you can give would be much appreciated.

The standard knuckles take two bearings and a plastic spacer, so the axle pokes out just enough for the pin that holds the wheel hub to be inserted into the hole.

This is how it looks:

http://www.tcphotos.net/image/Ru3Om

 

The GPM XV022 knuckles that arrived in the post yesterday don't seem to work that way.

If I try to use both bearings the axle won't go far enough through the knuckle, like this:

http://www.tcphotos.net/image/RuBJO

If I only use the outside bearing the axle goes too far, like this:

http://www.tcphotos.net/image/RuFV3

The plastic spacer from the stock knuckles doesn't do anything in the new ones.

Am I missing something really obvious?

Cheers,

Mark

 

[svenb 4449]

Looks like you have a different length wheel axle

[svenb 4449]

There are different length axles that tamiya use, TA04 type 

TRF415

TB03

Each has a  different length or pin hole location.

Looks to me like the aftermarket rear uprights you have suit the earlier 415 type

[DuntmatterReally 0]

11 minutes ago, svenb said:

Looks like you have a different length wheel axle

Thanks svenb,

Could you please explain a bit more?

[DuntmatterReally 0]

2 minutes ago, svenb said:

Looks to me like the aftermarket rear uprights you have suit the earlier 415 type

Even though they're supposed to be for an XV-01?

[svenb 4449]

Left xv01/trf417/TB03

Middle trf415

Right TA04/TL01 etc

 

[svenb 4449]

15 minutes ago, DuntmatterReally said:

Even though they're supposed to be for an XV-01?

I avoid aftermarket parts for one of these reasons.

Poor fit and wrong description.

Check what type of axles you have! They don't look tamiya either

[DuntmatterReally 0]

1 hour ago, svenb said:

Check what type of axles you have! They don't look tamiya either

They're GPM CVDs, (XV1238RST) so it's odd they don't seem to work with the GPM knuckles.

[DuntmatterReally 0]

I've worked out that the problem is not with the GPM knuckles themselves. If I use the dogbone and axle included with the kit they fit perfectly into the GPM knuckle.

The CVD shaft seems to be a match for the kit axle:

http://www.tcphotos.net/image/RhoRa

I don't want to let this defeat me!

Has anyone got experience of using the GPM CVDs?

[Honza 1184]

On 5/12/2022 at 2:53 PM, svenb said:

Left xv01/trf417/TB03

Middle trf415

Right TA04/TL01 etc

 

XV01 is a little odd - rear XV01 axles are ~2mm longer than fronts. Also, rear swing shafts are 39mm, while fronts are 42mm.

@DuntmatterReally The bearing you used with the XV01 axles is same as one you used with the GPM parts? It looks like the inner bearing wasn't fit properly in the previous photo.

[DuntmatterReally 0]

@Honza Yes, I used the same bearing each time.

OK, I'll try again with the inner bearing. When you say it doesn't look like it was fitted properly, do you mean it hadn't been pushed far enough into the knuckle?