In Reply to: anyone ditch the spare for can of Fix-a-Flat? posted by steve m on April 26, 2000 at 15:28:54:
When I bought it, they were working on it and they couldn't seem to balance the rear right tire properly... at least not for higher speeds. They started giving me words about how the rim could be messed up or warped. Eventually they took the tire off of the rim and saw fix-a-flat in it and the fix-a-flat was the culprit! They had to scrape all the fix-a-flat off the rim and out of the tire to get it to balance properly. Of course they took the fix-a-flat out and the tire deflated and killed the sidewall since I had to take it into Boston again with low pressure (slow leak)... I eventually got a new tire for free and learned never ever to use fix a flat on the car.
Fix a flat will kill your balance (in the wheel itself and also in the balance between the left and right wheels), gum up your rim, and be there perminently.
Regarding the crumple zone, taking the tire shouldn't adversly effect the crumpling of the car.
Finally... I haven't measured, but I doubt a rim, jack, tire, and wrench weigh 50lbs. I susped more like 30-35.
Hope this helps,