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Author Topic:   left front off the bead ..
carolinafast
Dirt Full Roller

Total posts: 72
posted June 06, 2004 04:39 PM  
ran on friday night...the car is starting
work pretty good ...mostly because of the help from you guys...thanks..we were leading
the heat race and lost the bead on the left
front this is the third time tire pressure
are lf 17 lr 17 rf 24 rr 24 PINTO stock 4
D.O.T 14" TIRES. Any thoughts???

KSGerry
Dirt Freak

Total posts: 376
posted June 06, 2004 05:07 PM  
If the tire is being pulled off the inside bead of the wheel, I would suspect a push in the corner causing the LF to drag across the track. If the LF tire is knocked off the bead on the outside then you might be hitting the inside berm of the corner.

I suggest more air pressure in the LF or try running a tube.

Trapper
Dirt Full Roller

Total posts: 64
posted June 06, 2004 07:21 PM  
I also have had problems with breaking the bead. I solved my problem by applying silicone sealant along the entire bead on both sides of the tires before inflating them, but do this 2 days before race to insure proper curing. By doing this it allowed me to run lower tire pressure to improve handling for me. I have ran as low as 10# in the left front with no problems using the silicone. Hope this helps you out some.

TRAP

bigcityracer
Dirt Freak

Total posts: 431
posted June 16, 2004 06:51 PM  
Check your toe. It maybe toe out and draging the bead off. Run the wheels straight or an 1/8 out.

juliaferrell
Dirt Freak

Total posts: 370
posted June 16, 2004 09:45 PM  
14 inch tires are bad about that. Rolling on those long side walls. Run a tube or no less than 21 or 22 pound of air.

mini-stock43
Dirt Roller

Total posts: 7
posted June 17, 2004 07:38 AM  
put a tube in it and run it. I have run 14in wheels with tubes in them for 5 years and have never rolled the LF off the bead. And i only run about 9-10lbs in the LF. A 14in tire has no more sidewall than a 13in


carolinafast
Dirt Full Roller

Total posts: 72
posted June 17, 2004 04:02 PM  
thanks a bunch all...ks, you were right. i think it was pushing and dragging the bead
off on the inside. we pumped the lf up to 23
and it stopped doing it. however, based on
the good info. we corrected a camber problem
and set the toe per bigcity's suggestion.will
see how that goes and try the silicone trick or a tube next week so we can drop the pressure!! thanks again to all

juliaferrell
Dirt Freak

Total posts: 370
posted June 25, 2004 12:43 PM  
a thirteen inch tire is 22.5 and 23 inches tall. take out the 13 inches and you get 9.5 and 10 inch sidewalls. A 14 inch tire is 25.25 and 26 and that subtracted is 11.25 and 12. Average of 2 inches more. 1" top and 1" bottom. Makes a huge difference on how a radial tire walks on the rim.

carolinafast
Dirt Full Roller

Total posts: 72
posted June 25, 2004 06:56 PM  
does that mean 14's are not good???

mini-stock43
Dirt Roller

Total posts: 7
posted June 25, 2004 09:30 PM  
the sidewall of a tire is measured with 2 factors.....the width of the tread (195, 215 etc) and the series of the tire(60, 70)
size of the rim has no factor in it.

multiply the width by the % of the series and you get your sidewall height.
yes.. your tire may be taller overall but the sidewall is the same.


juliaferrell
Dirt Freak

Total posts: 370
posted June 27, 2004 07:35 PM  
If I were confined to street tire class I would run 14" on 1/4 mile tracks. Mainly to raise roll center to create cornering ability. Old school philosphy liked running a taller tire and somewhat narrower. This was because race tires were bias ply. I like 13" mostly for the lighter rotating and unsprung weight!! A 14 inch tire combination weighs on average 10 pounds more than 13 combinations. Especially if your comparing street DOT casings to NON DOT stuff. And I'd put a measuring stick on those sidewalls to check out the sidewall heights?

dirttracker98
Dirt Freak

Total posts: 284
posted June 29, 2004 06:27 AM  
quote:
Originally posted by carolinafast:
does that mean 14's are not good???

when we had to run radials the only way to get 14 inch tires to work was with tubes,with the 13inchers unless you went super low on air not many problems at all.we used them tires from Pep Boys that sold{new}for $99.00 a set,you could'nt mix & match the 4 had to be the same size,so we bought a same sized spare and 1 taller & 1 shorter for stagger.they lasted real good,unless you got 'em cut off or run over a bumper or something like that.

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