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1985 XR100 Stiffer rear spring?

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Hi everyone,

I just bought a 1985 XR100 for my son yesterday and would like to install a stiffer rear spring. Any ideas? Retailers? Adapt from a bigger bike?

Thanks,

Todd

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BBR makes a stiffer rear spring but I wouldn't recomend it. your shock doesn't have the dampening to control it and it won't last.

The only good solution is a works performance shock they work very well but are kind of pricey.

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Agreed.

The BBR springs completely overwhelms the rebound damping on the stock shock body. Marginal for dirt, and horrible for roadracing/motard. Works or a custom are about it.

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I have BBR springs front and rear on my 04 XR100, along with a BBR frame cradle. Personally, I'm happier with the performance of the rear spring than I am with the fork springs. The rebound damping is a little light on the stock shock when used with the BBR spring, but I'm very satisfied with the way the bike rides and handles overall. Its not perfect, but a huge improvement over stock. Then again, I weigh 200 lbs, so a small kid might not like the stiffness. The BBR fork springs, on the other hand, caused a harsh slam on rebound as the forks topped out. I changed to 30 weight oil in the fork and it helped a lot

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Thanks. After looking at the rear shock more closely, it looks as if the bushings are completely wore out with gobs of play. After replacing these, I should gain about an inch-or-so of seat height. AFter that, I'll consider the over-spring on the rear, but I shouldn't need it yet.

Thanks again.

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You might also try wrapping some sort of vinyl tubing or hose around the shock between the coils. I read about this mod for stiffening the rear of an XR100 on a site for supermoto. This sounds like a cheap and effective way to increase the stiffness of the rear end without over-taxing the rebound circuit or causing a harsh top-out effect.

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