Cafe Racer Forum banner

1 - 9 of 9 Posts

·
Registered
Joined
·
1,399 Posts
Discussion Starter #1 (Edited)
Lacing a yz250 hub to 19 in xs650 rim with yz spokes. My runout right now is about 1mm. Anyone know how close to even I need my lateral runout? Specs are different for dirt and road. This is a dirt/road set up meant for the road. I'm aiming for .5 mm.



My torque spec is in question too. Right now I'm at about 40in/pds. Sound about right?
 

·
Banned
Joined
·
4,894 Posts
If you are using a used rim I doubt you will get it perfect.

Torque of spokes is not that crucial, them all being the right tension by hand is.

1.0 at the gauge is probably 2.0 total indicated run out T.I.R., BTW. ( T.I.R. gives a run out figure for BOTH sides, get it? )

Don't be surprised if there is some play in the hub bearings adding to the dial indicator T.I.R. reading.

Just true them up as best you can. Spoke wheels at speed will flex at least 1.0 in any case.

I'd only worry if I had near 3.0 T.I.R. on rims on a bike that goes regularly over 80mph.

You will need to check them again after you have run them on the bike for a while. Spokes do loosen and "bed in" .

Balance the tires.

Danger, is my business.
 

·
Registered
Joined
·
1,399 Posts
Discussion Starter #3
It's a brand new aluminum rim. I got it to about 1mm total runout. I'll try it that way and check it after it's been ridden.
 

·
Registered
Joined
·
3,449 Posts
You can get those rims to around 0.010" (0.25mm) pretty easy particularly if your using DTI.
Check your not trying to true out the weld though, that can have 0.020"~0.030" 'dip'
 

·
Banned
Joined
·
4,894 Posts
Yep, the weld bump and ally distortion can be a bit confusing at the dial.

Old school racers I have known place the tip of the dial probe inside where the tire bead runs. You might need to use a lever type dial gauge, not a straight one.

Danger, is my business.
 

·
Registered
Joined
·
1,399 Posts
Discussion Starter #9
I have another mitutoyo lever type I will hook up. The plunger type was more accessible but I think you are correct.
 
1 - 9 of 9 Posts
Top