The rear shock/springs I used in my build off bike seem to be extremely stiff....ass rattling stiff. I have no idea what make or rating they have, but the spring wire is .300" in diameter, and I can't compress them more than about 1/2" even when I jump on it. I've been looking at replacements, and I just wanna make sure I don't make a mistake, again. I've been looking at the ones on the OldMiniBikes site, SKU: AZ_1700-15, that are rated at 450lbs. Can anyone tell me what the spring wire diameter is?