Join Date: Jun 2004
Location: Northern Nevada
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Hey, I remember those rims, too... But I dunno where you're going to find them today.
The good news is that there are plenty of strong rims out there, and you shouldn't have any trouble getting fixed up.
I haven't been to 300 pounds, but I was at 270 for awhile and hardly ever had wheel problems on my road or mountain bikes as long as I didn't go Stupid Lite. Any fairly stout rim would work, but absolutely avoid anything with fewer than 32 spokes (I have 36s on everything now), and use good-sized tires at a modest pressure--you don't want 26x1.0 at 100 psi. I ride mostly 700x35 or larger on the street; the mountain bike equivalent would be 26x1.5 or bigger (I don't use road tires on my MB because I have three road bikes, but if you do, don't go too skinny). If you buy new wheels and your bike shop can't recommend something strong enough, I'd look for a different shop.
The jumps, incidentally, are a bad idea. You're going to break something eventually, probably a collarbone.