×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

geometry calculations for difazio front suspensio

geometry calculations for difazio front suspensio

geometry calculations for difazio front suspensio

(OP)
we are in the process of building a motorcyle with a harley engine.We want to use the difazio front swingarm configuration, but we aren't quite sure of the geometries we must use in order to avoid bumpsteer. Any help or tips will be appreciated.

RE: geometry calculations for difazio front suspensio

To quote Tony Foale;
"The layout of the suspension links defines the locus of the end of the steering arm on the upright, to avoid bump-steer the steering drag link must be of an appropriate length and be located such that it describes an arc coincident with the end of the steering arm."

In other words, if you have upper and lower swingarms of identical length and they are parallel, the steering drag-link must also be parallel and the same length.
In practice - for on-road bikes - if you can almost eliminate bump-steer for steering angles less than 5 degrees of lock it will not intrude into the riding experience. Larger steering angles should only be required at walking pace or less.

I suggest you have alook at Tony Foale's book "Motorcycle Handling and Chassis Design" ISBN 84-933286-1-8 before you settle finally on a Difazio FFE.
Have a look at his website at

http://tonyfoale.com/

ZR

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources