Maintenance & Technical > KX500 Original
Rear Wheel balance
kajendog:
Hi,
New poster, long time lurker.
My 2000 KX 500 rear wheel really vibrates, seems out of balance.
I have trued the rim side to side, but failed to check how true it is in the diameter. The problem is the same after multiple new tire changes this summer.
I was wondering if because of only 1 rim lock, it would cause enough of an out of balance to be significantly noticeable around 40-50 MPH. I haven't seen this discussed before so am thinking I may have an out of round rim.
Any ideas/suggestions would be appreciated.
Thanks!
Paul:
Hmm, thats a good question. I'm pretty sure Rick will be along shortly to share a pearl or two of wisdon. I have two rim locks on my bike - makes it easier to ride back if it pinch flats ;) - I haven't noticed too much vibration from back there though.
DanH1:
Yes the one rimlock will cause it to be out of balance and is notcable if you are riding on a smooth surface. Offroad/MX track you probably would not notice it.
Is there any visible runout when the tire is spun to indicate an out of round/bent rim?
Depending on what brand rimlock you have about 2.5 oz +/- should do the rear, 1.75 oz +/- for the front.
I always balance mine for running the Pikes Peak Hillclimb -class A dirt track tires on asphalt and gravel race course, speeds 95+mph.
Dan
kajendog:
Thanks for the input.
The rim and hub are stockers, and came with only 1 rimlock.
Yes I only notice the vibration when I have to connect a loop trail by an asphalt stretch or very hard dirt road.
Next tire change, I will check the roundness of the rim, then I will add a second rim lock opposite of the stock one. Check the rim balance, mount a tire check the tire balance. I am not trying to be anal, it really is a significant vibration.
Thanks for the input.
Kajendog
dezracer:
What about the wheel bearings? I always use 2 rim locks. It sucks to have a rear tire come flying off the rim at speed when you get a flat.
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