HELP - Darkside Wobble

[Loafer]

Take that bike for a ride up to Mac's house and let him look it over for you.

[macmac]

Tire Rack shipped my Dunlop SP 5000 with just a lable, so I don't see why you can't. Putting on a mc rear may effect the bike for a better, but it won't fix the cause. Finding the cause needs to be done, but I guess winter could work.

I wonder if the ct is seated on the wheel correctly. One way to check is get it off the ground, and use a dial indicator. If you don't have one, you could use a few bricks and a pointed stick.

I would check the side walls for out of true, and the tread for out of round. Dunlop could have shipped a bad tire i suppose, but they don't do it often.

[rhodyrider401]

Off for the weekend (in the cage). Will be revisiting this on Monday. Happy Independance Day!

[macmac]

Was driving for work, and wondered if maybe the guy bent the wheel swapping the tires?

[jandreu]

Dang Mac, I just started reading this thread and the whole way thru I was thinking the idiot bent the wheel mounting the tire. Would be easy enough to check on or off the bike. Jack the rear off the ground and spin the tire, I would think you could feel any bend with your finger sliding along the wheel bead.
Just my 2 cents...

[macmac]

The easy way with home made tools, is to lay up a few bricks, whittle a square stick and sharpen a point on it. Any stick long enought to hang over the brick will do, maybe a new sharp pencil even.

Set another brick on the wood so it won't move much. Make a caryon mark on the tire/wheel and slowly turn the wheel/tire unit.

No wheel or tire is dead true, but it should be off bt a whole lot either.

The tool you make is a primitive dial indicator.

At first the wheel/tire may in fact push the wood back. let it.

The idea is to see where the wheel/tire gets close to the pointed object, and how far it gets away.

Once the point touches lightly at the highest out of round, then everything else will be away. When you discover the farthest away a plug gaping tool with no more than say 0.040" should be able to measure the worst gap.

Or Spend a few dimes and buy a magnetic or vise grip dial indicator. That you just set up, slam into which ever you are going to measure, 0 it, and watch the needle jounce all over the scale.

0.040 would be a lot, but might be real world acceptable wobble. Larger than that might be a concern.

A guy who manhandles a tire changing machine can and will bend mag wheels.

When I hand mounted my Sp 5000 I had a fight on my hands. It took me 5 tries to get that tire on the wheel, and that was workin.

It took me 5 more tries to get the bead seated not surpassing 51 psi, which is stated as max PSI on the side wall.

I have no idea what equipment was used and how it was used.

Leaving the weights on the wheel is real strange.

When I change a tire any tire and I have done thousands over the years, the first thing I do is tear off all the weights.

[ponch]

Originally Posted by dougster

I have to ask. Did you check to see if the tire guy mounted the CT the right direction? (I don't know if there IS a right direction for that particular tire, but I had to ask.)

I was thinking the same thing and you were the first to mention it. ;)

[rhodyrider401]

i'll check the wheel, but I do NOT think he used a machine... I think he mounted it manually with spoons.
Tire IS mounted in the right direction.

[rhodyrider401]

Put 300 miles on today, about half on the slab. It seems to be getting a touch better. A few more miles and I am going to drop the reat CTire from 40pounds down to about 32, and see if there is a difference. Any more suggestions on the front tire PSI. I used to ride around 37, but had it a little higher today (and it def felt stiffer).

[MAS Tequila]

40 psi in the front, and drop the rear 2-3 psi at a time. 8 psi may give you a result you don't like. Mine settled in about 28 psi in the back.

MT