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Message: [QUOTE="osheen, post: 24460, member: 17476"] Why is there not a factor in the rate equation for distance between coils? If a spring has less distance between the coils it will be softer than one with a larger space between coils as in progressive wound springs. Another thing that I'm puzzled about is, I have two shock springs that are 5.3 Kg/mm. One is from RT and the other an OEM Yamaha (KYB). I trust that RT is acurate with their rating. The Yam spring was supposed to be a 5.2 Kg/mm. I had it tested by a reliable source and it came out to 5.3. The Yam spring was about 20mm shorter and I believe a tad smaller in dia. (the spring itself, not the wire dia.) Here's the dilema. They were each installed on identical 99 KX250s. The one with the RT spring was definitely softer. The one with the Yam spring felt way stiff and had too much static sag (without rider) to accomplish correct sag with rider aboard.It actually only had a couple mm of spring preload. Hence the spring being to stiff. I installed a 20mm spacer on the spring to make up for it being shorter, just to make sure I didn't run out of threads. But the spacer shouldn't matter in the equation anyway, because the spring was not shortened. When I had the spring on my YZ250 it felt just slightly stiffer than the 5.0 I took off, just as it should have. So what gives? Since the RT spring had more active coils for the same given rate would that change the characteristics dynamically? I just love these spring questions. It sounds like we have some intellegent guys among us too. ------------------ osheen BRC, AMA life member '01 YZ250F '77 KD100m '95 KDX200 '75 Road Toad '79 KX250 '74 Z50A [/QUOTE]

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