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Dec 1st 2016, 12:28 PM   #1
 
  Jul 2016
  tigard

  2013 Ninja 1000
tire balancing

I got some tires and mounted them up. I static balanced the front wheel and it is rock steady as I rotate it and stop and release the wheel. It doesn't budge from where I release the wheel The rear wheel originally had 40 grams on it from new. When I tried to static balance it, I had 42 grams on it and it would be rock steady as I moved it through 270 degrees of rotation. When the wheel was in the other 90 degrees of rotation it would not stay steady and would rotate on its' own. So I figured it had a secondary heavy spot and I took it in to a shop for a spin balance, rather than keep chasing my tail trying to get it perfect. I got it back and they'd put 63 grams of weights in basically the same spot I had put 42 grams. I put it on the static balancer and the wheel immediately starts rotating on its' own. I understand that spin balancing takes into account the rotational force of the heavy spot so it might place weights differently from static balancing. Should it be that much different? I took the bike for a short spin and it feels like there's some kind of imbalance coming through the chassis. Not sure that feel couldn't be coming from the front wheel that I static balanced, but that one seemed so perfectly balanced on the static balancer. Should I take it back and have them check their work? This is my first time changing/balancing street tires (changed lots of dirt tires) so any advice is greatly appreciated.
Dec 1st 2016, 12:36 PM   #2
 Flyboymedic's Avatar
 
  Jan 2016
  Hazel Dell, Wa

  Honda VFR800, Husqvarna TE 610, Ducati Hypermotard 1100S
FWIW, I've encountered the same thing where I had my wheel spin balanced and then once I got my own equipment a few months later, I static balanced it. It always had a small vibration after spin balancing and once I balanced it myself, it was perfect at high speed. I wouldn't trust spin balancing except on a car tire.
Dec 1st 2016, 01:15 PM   #3
 MarvTravis's Avatar
 
  Jan 2016
  Kirkland, WA

  Kawasaki ZX-14
If a tire has been properly static-balanced or properly spin-balanced, it will always be in static balance. Spin-balancing is a technique that includes balancing one edge of the tire against the other edge, (at the same location). Static-balancing balances only opposite sides of the tire, (around the circumference).

A tire that is out of static-balance will hop, whereas a tire that is out of spin-balance will wobble, (if it's a wide tire)

Motorcycle front tires are so relatively narrow, static-balancing is adequate. That said, if a tire is spun, it will demonstrate whether it is in static balance by exhibiting 'hop' or 'no-hop'.

If a tire is in static balance, but is out-of-round, it will 'thump'. You should be able to determine if the tire is not out-of-round by slowly spinning it with a fixed gage near the tread to visually verify there are no high or low spots.

Edited by MarvTravis on Dec 1st 2016 at 01:23 PM
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