I have an alloy framed Walmart cruiser that I bought as a fun beater and rain bike. I've had the bike a few months and just got around to taking some of the wobble out of the rims. I started the job as I do with my other and friend's bicycles by getting the spoke tension reasonably even with my Park tension meter.
After getting the spokes close to evenly tensioned both rims are now wildly laterally but not radially out of true. I spent hours trying to get these cheap alloy rims reasonably true and they are still a mess. I noticed that many of the pairs of spokes had very different tension readings before I started try to reasonably even out the tension.
This bike has only been ridden a few times and I weigh about 132 lbs so I don't believe the rims suffered any damage. I have had this happen once before trying to tighten and true a friend's big box store Schwinn mountain bike's rims- I finally had to take it to my LBS because I screwed them up so badly. I don't want to give up on getting this bike's rims back in shape- I want to learn how to true even crappy rims.
Is there a trick not normally done with reasonable quality rims?