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Author Topic:   Dry Slick Swing Arm LR ,2 link RR
Dirt Roller

Total posts: 18
posted June 12, 2005 08:46 AM  
We normally run a 3/8 semi bank track that is really dry slick come feature time. Good getting in the corner but have to wait to get back in the gas coming off. I,m just wondering if the springs we are running in the rear are to soft and we are getting coil bind. The left rear swing arm that is clamped on a bird cage to the rear end is a 225lb spring and the RR is also clamped is a 175lb spring. Do you think these are a little soft for a very dry slick track? LF650,RF750

Dirt Roller

Total posts: 6
posted June 12, 2005 11:19 AM  
I run a similar setup w/ 275lb on the LR swing arm and 175 RR on the housing. I've heard of people running 400lb springs on a LR swing arm.

Dirt Forum Champ
Total posts: 879
posted June 12, 2005 11:51 AM  
Try raising your RR link up one hole.

Dirt Forum Racer

Total posts: 80
posted June 12, 2005 08:18 PM  
There is a calculator for effective spring rate on this website in the tool box section. I would suggest that you take the dimensions off of your swing arm and calculate what spring you would need to provide a 200# lr effective spring rate. Don't be suprised if it is a 350 or something like it. The same calculation can be accomplished for the right rear as well where the effective spring rate should end up around a 175. Obviously the spring rates you referenced are way too soft.

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