Subject: RE: front front front front end problem end front end problem
Author: Jesse Open
Date: Aug 30, 2002, 8:02 AM
Post ID: 1710912528
We still use a tire lathe at the GM Tech Center to qualify tires.
Out of round tires USUALLY take considerable weight to balance ,and they
WILL bounce with resonances that seem to come and go thru the speed
ranges.
Dunlop K70s ??? YUCK ,the first thing to come off the old Brit bikes
was ALWAYS the front K70 . Not too bad on the rear,but prone to brake
cupping when used as a front tire.
John Prusnek wrote:
| Brian: Based upon my one time experience with this, I'd say that it would. My front tire started bouncing around 30-35mph, then smoothed out after that. The tire was perfectly balanced, I even had the balance rechecked; it was then that I noticed the runout since I was looking for a problem. It was also at this time that I noticed that the manufacturing date on the tires was 1971 (!). I figured that it was an old tire that sat in one place for years and developed a flat spot- I think the bike was stored for a long time before I got it. I should have noticed the age and scrapped them in the beginning. If your front end is bouncing around at speed and the tire's balanced and the rim is round, what else could it be? I'm no physics major, but I suspect that there's a bit of force happening at 30mph. A friend of mine used to work for a tire company, he said that they would occasionally chuck a mounted tire up in a lathe and trim the outside to make it round. He was suprised at how much some tires were out, some to the point that they went down to the casing, scrapped the tire and started over again. John Prusnek
|
I take mine anywhere without worrying WITHOUT disc brakes ! But then
again I never worried on ANY bike ,even the BRIT bikes with LUCAS
electrics !And they NEVER let me down.At least since 1966 !
1969 V700 Euro
1972 Eldo LAPD
1993 Cal III Fuel Injection
2003 EV NEXT YEAR !!