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-   -   RS-80 Wheel not true? (http://www.bikeforums.net/road-cycling/883486-rs-80-wheel-not-true.html)

wheelingmike 04-10-13 07:50 PM

RS-80 Wheel not true?
 
I bought a set of brand new Shimano RS-80 wheels from Ribble Cycles. Installation went smoothly. After installing them and spinning them, I thought I saw some wobbling when compared to a fix feature like the brake pad. Took out my disc brake runout indicator and checked the wheels. The front is running out of true by .015", the back is .010". Is this normal? What is the expected runout for a new wheel? All the spokes are tight with a squeeze test. These wheels have 0 miles on them. Thanks!

November Dave 04-11-13 10:23 AM

Quote:

Originally Posted by wheelingmike (Post 15496387)
The front is running out of true by .015", the back is .010". Is this normal?

Mike,
It's fine - actually better than fine. I would actually be very shocked if you could see that kind of an error with your naked eye against a brake pad. .015" is roughly the thickness of a piece of card stock. It is far better to have high and even spoke tension than to have a scientifically laser straight true wheel - it is rarely possible to build a wheel with very balanced tension and not get tiny errors like yours has. A balanced wheel that has a .015" error will be a far far better wheel than a wheel with .0000" error and unbalanced spokes - soon the latter will have much bigger errors than the former.
Enjoy them.
Dave

Clipped_in 04-11-13 10:25 AM

Quote:

Originally Posted by wheelingmike (Post 15496387)
I bought a set of brand new Shimano RS-80 wheels from Ribble Cycles. Installation went smoothly. After installing them and spinning them, I thought I saw some wobbling when compared to a fix feature like the brake pad. Took out my disc brake runout indicator and checked the wheels. The front is running out of true by .015", the back is .010". Is this normal? What is the expected runout for a new wheel? All the spokes are tight with a squeeze test. These wheels have 0 miles on them. Thanks!

That's less than .5mm. Fugettaboutit, and ride them 'til the rims asplode! ;)

wheelingmike 04-11-13 06:54 PM

Thanks guys. When you work as a manufacturing engineer in the aerospace industry for 15 years, you look at things a little differently. .015" runout is a mile off in my work place. But it's all relative. I'm just glad I don't have to send the wheels back. Thanks again!

TrojanHorse 04-11-13 08:36 PM

Check your tires and make sure they're mounted correctly! There should be a mold line all the way around the tire just a bit above the wheel that you can use as a visual indicator - if you don't get the tire seated correctly it can make your wheel look terribly out of true.

(don't ask me how I know)

Psimet2001 04-11-13 09:14 PM

Quote:

Originally Posted by wheelingmike (Post 15500484)
Thanks guys. When you work as a manufacturing engineer in the aerospace industry for 15 years, you look at things a little differently. .015" runout is a mile off in my work place. But it's all relative. I'm just glad I don't have to send the wheels back. Thanks again!

Yeah...you can practically hit 15 thou with a hand file, but remember this is also on a wear surface. Your brake pads will also lap the surfaces.

Clipped_in 04-15-13 03:48 PM

Quote:

Originally Posted by wheelingmike (Post 15500484)
Thanks guys. When you work as a manufacturing engineer in the aerospace industry for 15 years, you look at things a little differently. .015" runout is a mile off in my work place. But it's all relative. I'm just glad I don't have to send the wheels back. Thanks again!

Ha, that's because I'm just a Civil Engineer. We build terrorist targets, so If it's within about 1/2 inch were good!:thumb:

jsharr 04-15-13 04:06 PM

Wow, so cycling is rocket science now? Cool.


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