Wheel Balancing

[Hilux2400]

I have just put some new 285 30 18's on the back my 996 and the fitter said he had to add quite a few weights, too many in my view, as the wheels rims were not running true.  I could see that when turning on the machine there was a deviation in rim position.  This showed up on both wheels.  I was surprised as I cannot recall hitting anything since the last tyre change, when balancing did not require many weights.

 

I didn't take the car to the fitting shop, just the rear wheels.  When I got home I checked the wheels when they were back on the car and both the outer and inner rim on both wheels run true, with hardly any noticeable deviation.  I checked the wheels with a fixed pointer mounted on a block. 

 

I reckon the machine in the fitting shop is running out of line, but they assured me it's OK.

 

I think I will take the wheels back and get them to run another check.  I might even take it to a different shop, but  I have traded in the same place for many years and they are a good family business.

 

Has anyone else had a tyre fitting problem like this?

 

H

 

 

[RFM]

Start with first balancing the rim, without the tire,in order to determine the most massive point of the rim. Rebalance the rim with the tire mounted, the result is the most massive point of the tire. Match the most massive point of the tire directly opposite of the most massive point of the rim, this is the point where a minimum of weight must be added. Install the tires always with a minimum mounting kit to prevent slippage of the tire on the rim under acceleration. Mark a line corresponding the side wall of the tire and the inside of the rim so you can see later on if the tire is not moved against the rim.

[Hilux2400]

Start with first balancing the rim, without the tire,in order to determine the most massive point of the rim. Rebalance the rim with the tire mounted, the result is the most massive point of the tire. Match the most massive point of the tire directly opposite of the most massive point of the rim, this is the point where a minimum of weight must be added. Install the tires always with a minimum mounting kit to prevent slippage of the tire on the rim under acceleration. Mark a line corresponding the side wall of the tire and the inside of the rim so you can see later on if the tire is not moved against the rim.

That's  really good advice - thank you for your reply. 

 

However, in the meantime I have taken the wheels to a different shop and they balanced up as normal with very few weights.  Did it this morning.  What took more time was getting the adhesive off the rims which I did with white spirit and a sharpened plastic wedge.