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05 RM250 stock rear spring for what weight

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Been slowly rebuilding a new to me 05 RM250 but haven't got to play with the suspension yet. What was the target rider weight for that bike. Or my real question is will I have to change the rear spring for my weight 180-185 without gear on. And what about the front?

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.46 & 5.5 , same weight as you.  Stock setup is l-i-g-h-t.

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Stock setup is very light.  I'm 185-190lb.  I run a 5.7kg rear spring.  Could get away with a 5.5kg.  I also wear a bunch of tools and water and have a 3g tank though.  MX, desert and singletrack.

 

The difference in springrates between this and other bikes is from the slightly longer swingarm.  Stock is 5.2 on the RM, stock is 4.9 on the YZ, and that ratio is exactly the ratio between the swingarm lengths of the two bikes.

 

Been running 0.48kg front springs to prevent headshake and diving on big hills.  I like it overall, but have been wanting to try a set of 0.46kg springs back to back with it.

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