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Sportster Motorcycle Suspension, Frame, Forks, Handlebars, Fuel Tank, Oil Tank, Fenders Discuss Sportster Motorcycle Suspension, Frame, Forks, Handlebars, Fuel Tank, Oil Tank, Fenders problems, advice, and/or how tos.

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View Poll Results: What weight fork oil do you use
5w 40 9.62%
10w 87 20.91%
15w 115 27.64%
20w 40 9.62%
30w 16 3.85%
standard weight HD 76 18.27%
Screamin eagle HD 52 12.50%
Multiple Choice Poll. Voters: 416. You may not vote on this poll

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  #1  
Old 15th July 2005
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Default Poll: What weight fork oil do you use?

Anyone ever try 30W? How much of a difference does it make?
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  #2  
Old 15th July 2005
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I've tried various weights but the one that feels the best for my riding style and the roads I ride on is 15w.
I found 20w to be a bit to harsh so I would imagine 30w to be over the top
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  #3  
Old 15th July 2005
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Yikes - 30W would be like having no front suspension at all.

I think the general concensus is 15W Bel Ray.
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  #4  
Old 15th July 2005
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Bel Ray 15W
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  #5  
Old 15th July 2005
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Bel Ray 15
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  #6  
Old 26th May 2007
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I really need to change to fork weight on my bike...what weight is the stock fluids...and it seems like most suggest 15w???
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  #7  
Old 26th May 2007
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Bel Ray 15
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  #8  
Old 26th May 2007
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Go to the various websites of aftermarket oil makers and see what they recommend as equivalent to HD recommendations. www.amsoil.com is the only one I know, but I don't remember what they recommend. I went from stock to 20 to 10 to 5 and back to 10, along with many other changes. If you have to use 30 w, your springs are probably too light, or worn out, for your weight.
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Old 26th May 2007
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This poll is rather interesting. I weigh 230 - 260 lbs, depending on what gear is in the saddlebags. Probably heavier than most other guys. Yet with my forks set up as I describe below, the initial rate of my forks are softer than lighter weight guys, yet the bike handles better. So far, I am the only one using 10 w fork oil.

What I actually did was make the foks softer and softer until they were so soft the front tire would bounce and chatter over rough bumps. Then I stiffened them up just enough to get good dampening under all riding conditions and throughout the fork travel.

If you compare my spring rates to the Progressive progressive spring, the inital rate is softer and the final rate is harder. I think this is one of the keys to getting the Roadster to handle well. Because of the odd weight bias of the bike with rider on the bike, most of the rider weight ends up on the back end, therfore, heavier riders need lighter initial spring rates in the front. Opposite anything I have ever come across before.
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Old 26th May 2007
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Been running SE 20W up front for the stiffer ride that appeals to me from years of racing, bike handles just fine even with the 3* Mid-glide conversion up front, no wobbles, wanders, or shakes. just tracks straight and true.
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