How much play/tolerance for rear wheel axle

[BoukeG]

Hi all,


I've finally had some time to rebuild my XB-e with the 7075 parts.


I'm at the stage replacing the read wheel hubs. I have the 10mm rear wheel axles, bearings, and the 7075 hex adapter.


After screwing on the hex adapter and tighten it down, I've found there is a little 'play' or 'tolerance' (sorry for my bad English) in lateral direction. I think its about 0.2/0.3 mm. I didn't use the ring the original had (between the bearing and the wheel mount) since I felt that made it too 'tight' and run less smoother.


So here is my question, is this play 'okay', or is it better to make it tight and then also less smoother?

 

[Deluge]

The play is fine as long as it's not excessive. 0.2/0.3mm isn't a lot.

 

[Guest]

There is always some.

 

[BoukeG]

Okay, thanks. Just to be safe, I ordered some shims, 10mm, 0.2 thick...

 

[Deluge]

Let us know how it works out.

 

[BoukeG]

Will do, I got these:

http://www.liquidrc.com/index.php?main_page=product_info&cPath=0&products_id=1061

10x14x0.2 - should be enough.

 

[Guest]

Just don't get them too tight. Touching is ok but squeezing the bearings from the sides would cause premature bearing failure.

 

[Deluge]

I like a little play in wheel bearing area. Better to have the bearings roll as free as possible.

 

[Guest]

+1

I like to feel a little bit of latteral movement. That way I know it's not to tight.

 

[Ol' fart]

Thats funny. You should be able to screw the adapter all the way down tight against the bearing. Unscrew it untill you see a "flat" on the axle then tighten a set screw on the flat. Find the other flat and put a set screw on it too. I put in four set screw holes so you will have to unscrew it LESS than a quarter turn....... Ya'know, 1/4 turn on a 1.5 MM pitch is .37 so thats about right. On the old 6x1mm the max backlash would be .25

 

[Guest]

It worked perfect on every set I've installed.

 

[BoukeG]

Ya'know, 1/4 turn on a 1.5 MM pitch is .37 so thats about right. On the old 6x1mm the max backlash would be .25

Thanks Ol'fart! Great to know a .37 space is about right. So I guess 0.37mm is better than 0.0

Thank you for the feedback.

 

[Deluge]

Nice to see 7075RC chime in. Great support.

 

[BoukeG]

Agreed, also direct support is great!

 

[rev9fan1]

so what the heck is the difference between these and the rampagehopup ones?

 

[Guest]

The 7075RC thread onto the axel in addition to the set set screws. That's why the have two choices. The 7075 RC adapters mount the wheel in the factory location.

The RAMTech adapters don't thread so no need for different choices. The same adapter will fit all the X-series platforms. They are the extended style which gives your ride a wider stance.

 

[rev9fan1]

different choices meaning if you want to switch between stock wheels and hpi wheels

 

[Guest]

By different choices, I ment 7075RC sells a 6mm and an 8mm adapter. That refers to the size of your wheel axel thread.

 

[rev9fan1]

also how do you bolt the hpi wheels onto the 7075rc adapters if there is no where to thread the nut on?

 

[Guest]

The current style uses a cap with four screws. It's unique. The idea was to prevent the cap from spinning off while driving.