Posted 2/4/2016 9:26 PM (#87776) Subject: frnt tire cupping on one side, double car on goldwing
Location: Eastern WA
91 Wing with Champion double car, Daytona 2+2
I have a radial car tire on the back and the sidecar and a 130/70/18 Battleaxe B45R Bridgestone rear M/C tire running as a front tire. The front tire is running reverse rotation.
We have been doing a lot of 75mph expressway driving lately
I have been running about 35 lbs of air in the front tire. I am getting cupping on one side. Pretty severe at present as it's .100 deep on the sidecar side, much less on the outboard side.
I bumped the air pressure to about 42 to see if that would help.
The bike has 1.0 KG springs in it and cartridge emulators. The sag on the fork isn't right yet. Been too busy fixing it and driving it. Had some issues with the bike itself so I haven't had the time to take the fork apart and put more preload on the springs.
I have some questions. What do you do to slow it down or stop it?
What causes it?
Posted 2/9/2016 11:34 AM (#87835 - in reply to #87834) Subject: Re: frnt tire cupping on one side, double car on goldwing
Location: Rapid City, SD
My experience has been that radials don't do well on my rig. I get cupping on my front tire well before they are worn out. The noise and vibration are very annoying and require that I replace the tire. I have been trying to find good bias ply tires. My current set are Dunlop (505's?) but they are noisy and my wife noticed the noise right away and wondered what was wrong. I know this isn't a "help me chose my tires" thread but you have touched on a need. I am considering the cheap brands. I hate having spent $130 to $160 on a tire and have it cup or be noisy or wear out quickly.
As you can see my rig is a wide car much like the rig with the cupping problem.
Posted 2/9/2016 3:20 PM (#87841 - in reply to #87776) Subject: Re: frnt tire cupping on one side, double car on goldwing
Location: Edwards, CO
They come in either. Click on the size and you will see what will work for you. These are made for big cruiser and touring bikes. Get the touring as I think they last longer.
This is the 880 that I used to use but I switched to the 888 and I think I like it a little better. 888 only comes in one 18 inch size if that will work for you.
Posted 2/9/2016 6:23 PM (#87846 - in reply to #87776) Subject: Re: frnt tire cupping on one side, double car on goldwing
Location: Spanaway, Wa.
On the front I have been using Bridgestone BattleAx BT45, 130/70-18 @ 36-38 PSI. I used this on my prior GL1800 too without a sidecar, and a rear car tire also.
On the rear I use car tires. I like the 195/55R-16 Firestone Precision Touring @ 28 psi, I have also used the 195/55R Bridgestone Potenza G 019. I tried a winter Bridgestone tire but it wore out too fast. Prior to the sidecar days a winter car tire worked OK on the rear, but not with a sidecar attached. If I did a lot of riding in the snow I wouldn't mine it wearing out too early.