Out of round tires?

[Rando]

What is meant by "our of round" tires? Is the tire defective or just mounted improperly? I'm getting a lot of frontend vibration around 40 mph and it seems to be caused by the tires, at least from what I can tell. I'm pulling them off tomorrow to have them checked. Maybe bent rims since the potholes in Michigan could swallow a car!

 

[GeoffCee]

What is meant by "our of round" tires? Is the tire defective or just mounted improperly? I'm getting a lot of frontend vibration around 40 mph and it seems to be caused by the tires, at least from what I can tell. I'm pulling them off tomorrow to have them checked. Maybe bent rims since the potholes in Michigan could swallow a car!

I have no idea what is meant by out of round tires. It seems to me that a tire made of rubber, a pliable material, is obliged to adopt the roundness of the wheel it is mounted on. But I do know what is meant by an unbalanced wheel when it throws its weights. I've had that happen and vibration follows as reliably as night follows day.

Before you pull your tires off their rims, jacking up the front end and spinning the wheels by hand against a fixed pointer will show readily enough if your wheel and tires are running true. If you have bashed a wheel down a Michigan pothole hard enough to knock it out of shape I'm sure you would remember, I imagine an impact severe enough to do that would hardly go unnoticed. :yikes:

 

[NancysToy]

An out of round tire is a tire that does not spin true axially. Same deal as rim run-out. If the rim is true but the tire surface is not, the tire is out of round. All tires are this way to some extent, at some times. After sitting still for a long while, especially in the cold, flat spots develop that take a while to heat up and work out in use. The problem with out-of round tires was more prevalent with bias-ply tires, which could have stiffer spots in the casing, which cause the tires to roll out of round. Severe out-of-round conditions that adversely affect the vehicle are not real common with radial tires and modern production methods.

 

[SpyderAnn01]

An out of round tire is a tire that does not spin true axially. Same deal as rim run-out. If the rim is true but the tire surface is not, the tire is out of round. All tires are this way to some extent, at some times. After sitting still for a long while, especially in the cold, flat spots develop that take a while to heat up and work out in use. The problem with out-of round tires was more prevalent with bias-ply tires, which could have stiffer spots in the casing, which cause the tires to roll out of round. Severe out-of-round conditions that adversely affect the vehicle are not real common with radial tires and modern production methods.

Scotty your knowledge never ceases to amaze me!

 

[NancysToy]

Scotty your knowledge never ceases to amaze me!

Be glad I didn't regale you with stories about tire-truing machines (and scams).

 

[Bob Denman]

Question: Can a tire be mounted "improperly"? By that I mean could some extra attention given to getting the bead more evenly into the rim? :dontknow:

 

[GeoffCee]

Question: Can a tire be mounted "improperly"? By that I mean could some extra attention given to getting the bead more evenly into the rim? :dontknow:

Every tire I've had fitted, and I've had a few over the years, has had soap wiped around the tire and wheel rim so that one will readily slip against the other. Then the tire has been inflated with sufficient pressure for the tire bead to eventually "pop" into place on the wheel rim. Physics says that the pressure acting on the bead is equalised all around the tire/wheel combination, not nearly the same pressure but exactly the same pressure.

Given wheel and tire sizes that are compatible and assuming both are undamaged what additional attention did you have in mind, Bob? :f_spider:

 

[NancysToy]

Question: Can a tire be mounted "improperly"? By that I mean could some extra attention given to getting the bead more evenly into the rim? :dontknow:

Every tire I've had fitted, and I've had a few over the years, has had soap wiped around the tire and wheel rim so that one will readily slip against the other. Then the tire has been inflated with sufficient pressure for the tire bead to eventually "pop" into place on the wheel rim. Physics says that the pressure acting on the bead is equalised all around the tire/wheel combination, not nearly the same pressure but exactly the same pressure.

Given wheel and tire sizes that are compatible and assuming both are undamaged what additional attention did you have in mind, Bob? :f_spider:

As Geoff has said, if the tire is mounted correctly, the bead should seat properly. If the bead does not seat as it should, it is usually quite obvious from inspecting the tire at the circumference of the rim.

 

[SpyderAnn01]

Be glad I didn't regale you with stories about tire-truing machines (and scams).

You are like a real live Google for everything Spyder/motorcycle related!

 

[GeoffCee]

And with Scotty you don't get 75 lines of stuff like Buy Out of Round Tires from OutofRoundTireWorld.com

You don't get any free offers, neither. :roflblack:

 

[Bob Denman]

And with Scotty you don't get 75 lines of stuff like Buy Out of Round Tires from OutofRoundTireWorld.com

You can BUY them that way????? :shocked: :roflblack:

 

[boborgera]

You can BUY them that way????? :shocked: :roflblack:

Yes you can ' But there only used on Shopping Carts when they run out of the Square ones':roflblack:

 

[Bob Denman]

I guess I need to go get a shopping cart then...

 

[BLUEKNIGHT911]

TIRES

On the rim thing I almost positive the rims on the spyder are alloy and will not bend....If they are hit that hard they will crack or a piece might actually break off.....What do think Scotty...............:thumbup:

 

[capt.jim]

The wheels are Chinese castings, and will probably break or crack before they will bend. The GS/RS fronts also have a fair amount of runout, not very true at all.

 

[NancysToy]

Rando had a bent one, as I recall.

 

[FrankPa]

Another possibility...

could be 'ply steer' similar to axial runout. The steel belt in the rubber may not be placed properly and may cause vibration and 'pull'.

I used to sell and mount in a [very] prior life... my daughter tells me I'm "an old tire guy."