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!

*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.

Jobs

Hello, what general effect same ti

Hello, what general effect same ti

(OP)
Hello,
what general effect same tire wide mounting on various rim wide?
tire cornering stiffness,vertical stiffness,slip angle,etc.
how affect cornering performance ?

Thank You
Radek

RE: Hello, what general effect same ti

Radek,

Very complex - too complex for this format.

But I can tell you that within the range listed by the tire manufacturers, tire properties don't change much.

Also, what Jim Hall was talking about was bias racing tires, which act quite differently than modern radial street tires. His point was good, but you have to take it in context.

RE: Hello, what general effect same ti

(OP)
OK,Thank You,
simply I must decide which best rim size use for my racing tires
(narrower always lighter with all obvious benefits .....unsprung,inertia.......but?)

RE: Hello, what general effect same ti

I never met a tire that didn't improve with a wider rim, including race tires. Relaxation effects (transient response in Fy, Mx, and Mz) become better (faster and co-dependent), too. Even measureable Fx goes down in many cases. Be sure to match the scrub radius, other wise you are adding some conflict. Air pressure to prevent de-beading must also be monitored more closely.

That's why we measure such stuff. It avoids the rumors, tall tales and religious theories of tire disciples.

It helps to know what the rim was that your tire was developed on.

Downside is increased sensitvity to nibbling and trough wander (steering pull problems) via the Mz/camber characteristics and limit handling degradation because your camber curves are not right for the rim you wind up with. And of course, some ride issues. You are basically messing with the sidewall impedance.

RE: Hello, what general effect same ti

(OP)
Thank You Cibachrome,
all race tire manufacturers give quite wide range rim size recommendation, then many "racers" go narrower rims for cost and weight reasons.
I think ,that is not best way how get maximum from their tires.

also seems, use narrower rim for crossply tires really affect contact patch wide

RE: Hello, what general effect same ti

Radek,

Yes, it is very helpful if you give us context for your question.

As a general rule, you want to use as wide a wheel width as you can for racing. Most of the properties desired for racing are either improved or not harmed by using wide wheels.

But it is my understanding that most sanctioning organizations limit the wheel width as part of the rules package exactly because of this. You should check the rules before you start.

But when it comes to street tires, it's a different kettel of fish. For one instance, ride is hurt by using a wide wheel.

RE: Hello, what general effect same ti

(OP)
Thank You Barry glasses

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


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close