R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Nitro On-Road

Reply
 
Thread Tools Search this Thread
Old 11-28-2004, 09:12 PM   #1
Tech Elite
 
AMGRacer's Avatar
 
Join Date: Oct 2001
Location: Brisbane, Australia
Posts: 3,939
Default Rubber tire "ring of death"

I was running some CS32 take offs on take off rims with medium take off inserts on my R40 on a concrete track. After around 4 tanks of fuel my tires have developed a "ring of death" on the inside of the tire. The inside of the tire around 2mm from the sidewall has a large wear "groove" in it, the rest of the tire shows normal wear. I normally run 36R sorex on medium A sorex inserts and have never encountered this before.........

My camber settings is around 2 degrees front and rear, again I have used this camber settings on my sorex tires.

Any ideas about why this wear ring occurs?

Incidentally the tires were making a huge amount of grip.
AMGRacer is offline   Reply With Quote
Old 11-29-2004, 01:55 AM   #2
Tech Master
 
FREAKAH's Avatar
R/C Tech Elite Subscriber
 
Join Date: Jan 2002
Posts: 1,389
Default

Try running 1.5 degree camber or maybe even less. That and/or use a thicker insert.

Like you said, the tires were probably generating more traction than the Sorex tires so that, along with the 2 degree camber, probably folded the tire on the inside edge of the tread causing the wear groove in the tire.
__________________
Second-Hand Racing
RACE WORLD HAWAII
Losi Type-R |Tamiya F104 PRO | Tamiya F103 | Mugen MTX-4R | AE FT GT2
FREAKAH is offline   Reply With Quote
Old 11-29-2004, 02:18 AM   #3
Tech Master
 
Rapid Roy's Avatar
 
Join Date: Oct 2002
Location: L.A. (Rowland Hts)
Posts: 1,531
Default

Sounds like your insert is getting pushed to one side of the tire durring hard cornering. You could glue your insert to the tire with some contact cement. I used to do that all the time. I seem to remember gluing the insided being against the rules for IFMAR or ROAR though so you might want to check first.
Rapid Roy is offline   Reply With Quote
Old 11-29-2004, 02:47 AM   #4
Tech Elite
 
AMGRacer's Avatar
 
Join Date: Oct 2001
Location: Brisbane, Australia
Posts: 3,939
Default

Quote:
Originally posted by FREAKAH
Try running 1.5 degree camber or maybe even less. That and/or use a thicker insert.

Like you said, the tires were probably generating more traction than the Sorex tires so that, along with the 2 degree camber, probably folded the tire on the inside edge of the tread causing the wear groove in the tire.
Thanks! I am using pre-glues so I dont have the option of messing with the tires in any way, I will try the camber suggestion.......
AMGRacer is offline   Reply With Quote
Old 11-30-2004, 11:52 AM   #5
Tech Regular
 
Join Date: Mar 2003
Location: UK,the sunny north
Posts: 329
Default

the pre glued take offs are not really any good for nitro racing, the insert is too thin and too soft, can you not get hold of the tyres on there own, i usually run echo medium thin inserts
__________________
Speedmerchant WGT
Shepherd V10 Velox Idm evo 4
Shepherd V8 velox Idm evo 4
www.DHmodelsport.co.uk
jas1 is offline   Reply With Quote
Old 12-01-2004, 05:23 PM   #6
Tech Addict
 
fraz's Avatar
 
Join Date: Mar 2002
Location: Santa Cruz, CA
Posts: 653
Send a message via AIM to fraz
Default

When I ran rubber tires in nitro sedan I usually ran 1 degree of negative camber and no more than 1.5. The other two thing you want to look at are:

a) front toe - the more you have, the quicker the insides of the tires will wear in the front.

b) camber gain - depending on your camber link length and angle you can adjust the camber gain. Camber gain is how much your camber increases throughout the suspension compression. If you have a lot of camber gain with a static 2 degrees of negative camber, that could explain the wear.

The other thing to keep in mind is that some surfaces are just plain abrasive and chew up tires. Unsealed asphalt and roughed concrete come to mind). Not much you can do on these surfaces besides looking for a tire manufacturer with good grip and better wear.
fraz is offline   Reply With Quote
Old 12-01-2004, 06:16 PM   #7
Tech Elite
 
AMGRacer's Avatar
 
Join Date: Oct 2001
Location: Brisbane, Australia
Posts: 3,939
Default

Quote:
Originally posted by fraz
When I ran rubber tires in nitro sedan I usually ran 1 degree of negative camber and no more than 1.5. The other two thing you want to look at are:

a) front toe - the more you have, the quicker the insides of the tires will wear in the front.

b) camber gain - depending on your camber link length and angle you can adjust the camber gain. Camber gain is how much your camber increases throughout the suspension compression. If you have a lot of camber gain with a static 2 degrees of negative camber, that could explain the wear.

The other thing to keep in mind is that some surfaces are just plain abrasive and chew up tires. Unsealed asphalt and roughed concrete come to mind). Not much you can do on these surfaces besides looking for a tire manufacturer with good grip and better wear.
I found I had 2 degrees front and 2.5 degree rear camber which I have reduced. Also I found that I had a ton of front toe out (I had not checked it for a long time). I do have a lot of camber gain in the rear as well which I have reduced.
AMGRacer is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
NOW ENTERING THE RING!! At 14 OZ's THE NEW 5000 SS 7.4V WEIGHTED "SANCTION SPEC" PACK JAM MaxAmps Electric Off-Road 20 02-26-2008 12:43 PM
NOW ENTERING THE RING!! At 14 OZ's THE NEW 5000 SS 7.4V WEIGHTED "SANCTION SPEC" PACK JAM MaxAmps Electric On-Road 7 02-25-2008 05:29 PM
Victory "King of the Ring" Hock Wisconsin & Illinois Racing 95 08-18-2007 02:06 PM
""" XRAY FK05 """ excellent cond/super clean/stock evostyle R/C Items: For Sale/Trade 9 06-29-2006 10:04 PM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 05:56 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net