PR4 GT front, how much weight is excessive?

[smokerider]

I put a PR4 GT on the front last night, the old PR2 had 30grams weight on it. I stupidly did not balance the wheel when I had the tire off so don't have a reference.

With the new tire, it took 58grams. Bearings are great, wheel spins easily on the balancer, and I just did two tires on sport bike with it last week and they came in normally so I'm not suspecting stiction with the balancer, or a sudden change in the earth's gravity field.

 

[Ignacio]

58 grams? Oh, that's exactly 1 too many and things will explode! Everybody knows that 57 grams is the published limit!!!!!

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If it bothers you, dismount, try your wheel balance trick, and/or rotate the tire 180 degrees.

 

[smokerider]

Don't know that it bothers me, just an anomaly, in my limited experience. I've rarely had to put more than 20 grams on a bike tubeless. Next change I'll spin the wheel and see if it's the wheel out of balance.

 

[RaYzerman19]

My wheel is out 30 grams all by itself....... go ride.

 

[ionbeam]

...Next change I'll spin the wheel and see if it's the wheel out of balance.

It is out of balance. Fred W and I marked the wheels inside with a sharpie so we would know where the light spot was, this spot seems to be in a similar location on all wheels. When you look inside the rim you will probably see a rough ground out area where the factory did a rough wheel balance.

I don't see 2 oz of weight as a problem. If your bike doesn't have vibrations that start over 60, or if the vibrations don't get worse as speed goes up your wheel is balanced correctly. I have a lot of weight on my rear PR4 but it's much easier for me to ignore it than break the bead and rotate the tire on the rim which *may* help the balance.

 

[FXRS]

A tip regarding mounting & balancing PR4 GT's that I picked up from someone, somewhere on the forum.

Since there is not a traditional "balance dot" on the tire itself like you usually see on say a Dunlop or Pirelli then try this:

Position the tire on the rim so the computer bar code on the tire is opposite/across the way from the valve stem of the wheel. The gent originally posting this tip said he had found it reduced the amount of weight needed to balance on something like seven different sets of PR4's he had mounted.

I passed the tip along to my local dealer/mechanic (very trusted) when he was doing mine. He chuckled, gave it a try and wouldn't you know it, it worked. Not sure how many ounces exactly but didn't take much to do final balance.