65mph shake. What helps it?

[quadmasta]

My roll bar made it MUCH more evident. How can I lessen it?

[quadmasta]

I'm an idiot, calling a mod!

[Pitt]

Have you had your wheels and tires road force balanced?

[quadmasta]

Nope. My tires are probably all screwed up from sitting for 8 mos with low air without moving so I should spend a couple bucks getting a balance :) What's makes a force balance different from the regular type? Some sort of weight or force applied in a load to the tire, I assume :)

[ericsbestshot]

road force balance is done with the wheel on the car. so it kinda balances every thing that is rotating instead of just the wheel and tire

[CaveRacing]

Not necessarily. Eric, you are referring to On-The-Car balancing...usually high speed balancing.

Road Force Balancing is different. They use a machine (Hunter is the one that I've used) that does use force against the tire. It helps find the low and high of the wheel and the tire so they can be properly matched and mounted. It is rather precise, if done properly.

[ericsbestshot]

but isn't there a machine that does both? i could be wrong. I had my wheels balanced on the car and it was very smooth afterwards

[CaveRacing]

Perhaps On-the-car balancing is considered road force balancing, as well. Either way, on-the-car works really well.

[Oblio]

go with CaveRacings comments on balancing, the 65 MPH shimmy is quite common Force Balancing is the only cure.... or new wheels hehehe

[Reverend Greg]

28 psi and new tires

[jzilla]

65 mph shimmy is standard with all miatas. lol

[tbone heller]

Be sure that they drive your car at least 30 miles at highway speeds & your car is lifted up on the rack after the test drive. This is the only way to get accurate readings from the Hunter road force machine. This is done to eliminate "flat-spotting". Also, be sure that the "heavy" part of the tire is positioned at the 12:00 position when the lugs are torqued.

[mustangtomiata]

Go faster lol works in my car.

[BFH miata]

Officer: Why were you speeding?
You: Well, sir, the miata has a 65 mph shimmy that is very annoying. If I drive a little faster, it goes away...

[matredd]

neither one of mine ever had the shimmy and shake

[RotorNutFD3S]

Mine went away after I got the 3-point strut tower brace. A standard brace will help a lot too.

[wildfire0310]

Mine went away from a good balance.

Then I switch rims and got the shake again. The rollbar got rid of it again.

I remember reading about how the front under braces help to remove it. So based on that and Eric's comment get a good front brace to help offset all the rear bracing that the roll bar added.

[Synthmob]

I know... let's ask Don at miata.net!!

[luckyxiii]

Go faster lol works in my car.

+1 mine starts at around 60 in the auto miata (yeah...I know) and like at 70 in the manual...get on the loud pedal a little more though and it smooths out.

Honestly, I'd just suggest checking your tire pressures and buy some better rubber

[DecoyOctopus]

i had that problem but i learned alot of *******s dont balance wheels correctly theyll just put sticky weights on or the kind that they beat on the lip of the rim. i had to learn how to use that machine to realize the dudes that balanced my wheels were doing it wrong. it was a hook-up (aint no money involved) but still if you gonna do sum do it right. also torque your wheels down with a torque wrench in the right sequence to about 83 foot-libz and if you have aftermarket wheels make sure they have hub rings if necessary. discount tire gives them out for free (aint no money involved) but chyea i never had an on the car balance sounds like it would do the trick too.