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Old 04-05-2014, 07:58 PM   #31
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I think it would be interesting to see a new tire designed which uses the same mounting bead as an 8th scale off road tires. I think it would give a stronger glueing surface and maybe some additional handling characteristics. Tire designs have remained relatively unchanged through the years, Just something to think about.

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Old 04-05-2014, 10:54 PM   #32
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I guess for most of you the tires handing characteristics become undesirable before the surface gets thin enough to blow out.
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Old 04-06-2014, 05:18 AM   #33
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We ran 24mm rubbers with 1700g nitro cars.

They held up ok and didn't blow out with foam inserts.

Biggest limitation on the current tyres are the inserts.

Cars are now lighter and more tracks are becoming smaller on average often indoors.

I would be going the other way, narrower and lighter tyres, rims, inserts.
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Old 04-06-2014, 07:37 AM   #34
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Quote:
Originally Posted by snoopyrc View Post
I guess for most of you the tires handing characteristics become undesirable before the surface gets thin enough to blow out.
As Rick has pointed out in the pre-worlds thread, they appear to be blowing out because the belting is not thick enough, and can't cope with the loadings. It's not simply a case of running the tyres to the belt, as there are new sets every run at the pre-worlds I believe.
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Old 04-06-2014, 10:25 AM   #35
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After watching some of the vidoes of the worlds warmup and cars coming down the back straight at an average of 65mph and some over 70 maybe we need to look at better tire construction or heavier duty belting to handle the rotational force of 70mph. Wider tires built the same way are still going to come apart at that high of speed.
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Old 04-06-2014, 07:27 PM   #36
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If you'll pardon a old dinosaur chiming in. I don't know squat about modern TC tires but do have a history from back in the day with 1/8th scale and played a engineer during the week.

From what I saw at the Preworlds this weekend, not much has changed since back in the day with aerodynamics. Back in another life, the 1.8th scale cars were carrying about the same speeds and aero did make a big difference in handling. I would believe that while today's cars are heavier than we ran, the earlier poster was correct that aero would be a route to explore before the need to change tires.

I would also be curious about how much could really be gained in lap times just with wider tires. The gains from the contact patch will have to be more than the added rotational inertia and the rolling friction. You're also going to have to look at perhaps different materials for the wheels to combat flex both lateral and rotational shear. Just as a guess, the shear forces against the glue added to the flex force across the wheel's face is what was blowing out the tires this weekend.
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Old 04-06-2014, 08:22 PM   #37
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Interesting but a bit too scientific. Nice read though.
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Old 04-06-2014, 08:55 PM   #38
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Oops! Sorry. Kind of math-speak for too wide of tires tend to twist off the rims.
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Old 04-06-2014, 09:54 PM   #39
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Whether the tire is wider or narrower, when its spinning at 70 plus mph its destined to blow out. Maybe its time to look at a radial type of tire, but the thing is going to be heavy.

Just for fun mount one of your tires on a variable speed drill press and spin it up, you get some serious distortion and I don't think its even gets up to 70mph.
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Old 04-06-2014, 10:11 PM   #40
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Having a constant wheel size and regulation is one of the things that makes touring a good class with excellent continuity- like 1/8th buggy. With wide tires we'd all need to run new suspension geometry, knuckles, and such. There would be a long period of innovation to find the best solution that is would cost racers an arm and a leg to keep up with. There are lots of things that could make our cars faster, but that doesn't mean we should actually do some of those things.
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Old 04-06-2014, 10:31 PM   #41
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Why don't we all just go back to foam tires
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Old 04-06-2014, 10:41 PM   #42
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Why don't we all just go back to foam tires
I think that's Brian's secret agenda. Wider, tire doesn't explode at high speed...... sounds like a foam tire to me.
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Old 04-06-2014, 11:34 PM   #43
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Many years back we used to run 28mm rubber tires in the nitro TC category.
Heck I still have some old Losi tires that worked really well. Still got unmounted wheels and all. They were a pretty standard size back then before 26mm became the norm. So to say that we should maybe try something new, like wider tires, indicates to me that maybe you were not aware that some of us old timers have been there and done that. as a matter of fact, I am almost sure most all TC cars came stock with 28mm tires in the kit. I'm pretty sure my old HPI RS4 did.
As far as a vote goes... I would have to say that 26mm is fine as it has become the standard for a reason and having more choices will only increase cost and confusion. Two factors that have killed more than a fair share of classes. Can't wait till F1 tires/wheels get standardized. $50 a set is silly.
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Old 04-07-2014, 05:32 AM   #44
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Rick has made 2 posts on this thread, and both are bang on. We should stop making excuses for people making products (and other people choosing them) that simply aren't up to the job.
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Old 04-07-2014, 05:38 AM   #45
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I think you mean used to run 26mm with nitro TC then moved to 24mm.

We ran the 26mm as well and they didn't perform as well as the 24mm.
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