What tires to use?

[woodrow]

Now, i'm designing a race/rally car. It's based around the Mamba Monster X motor/ESC combo. I am currently designing it using CAD onshape and then i'll CFD it.
This car is fully aerodynamic and will ( hopefully! ) hit the 100mph mark.
Now that is a lot of speed so I'll need some tires that won't make pancakes on the first run!
Anyone has suggestions?

 

[332_RC]

Welcome to RCT!
Look at GRP tires. Kevlar belted & flexible wheels.
GRP TIRES

 

[gragner66]

Foam tires used to be used to hit 100mph RCs back in the day. I have a HOT Bodies Ve8 buggy that is the HPI Vorza and Trophy buggy we’re cloned from. That reached 100mph on crazy builds . I was able to get 70+ out of mine. I have a set of those GRP tires too. They are solid built.

 

[Littlemotor]

GRP XM3 for speeds up to 140-150mph. In excess of those numbers, move to a BSR Foam. And get a tire truer as well. Not all tires are created equal, especially when it comes to speed runs.

 

[woodrow]

Thanks a lot!
I think i'll look at the GRP tires since they are rubber.
By the way the dia must be 100mm, the model is intended to be used on tarmac. Are 100mm tires hard to find?

 

[Littlemotor]

Thanks a lot!
I think i'll look at the GRP tires since they are rubber.
By the way the dia must be 100mm, the model is intended to be used on tarmac. Are 100mm tires hard to find?

The GRP XM3 is 99mm O.D..

 

[woodrow]

Ha! Wrote my reply before I looked into the site, sorry!
Yep, looks good for my new racer.
Is there a wider version?

 

[Littlemotor]

Ha! Wrote my reply before I looked into the site, sorry!
Yep, looks good for my new racer.
Is there a wider version?

Not in a compound/design that will survive for your needs. They’re made for 1/8 “sedan” style onroad cars. Basically a 1/8 4wd buggy, that’s been lowered, stiffened up, and ditched the rear wing in favor of front and rear sedan style body mounts. Also for Arrma Limitless, Traxxas XO1, and Ofna DM1. You could find wider foam tires in 1/8 GP pan car, but they wouldn’t survive at the speeds you’re looking to hit, and likely surpass.

 

[woodrow]

What about model f1 or drag racer tires?

Foam tires used to be used to hit 100mph RCs back in the day. I have a HOT Bodies Ve8 buggy that is the HPI Vorza and Trophy buggy we’re cloned from. That reached 100mph on crazy builds . I was able to get 70+ out of mine. I have a set of those GRP tires too. They are solid built.

Good! the only thing is , is that i'd like my tires to be rubber, not foam.
Are foam tires good for cornering?

 

[Littlemotor]

What about model f1 or drag racer tires?

There are only (3) tires I know of that will do what you need. The two I listed above (ran by almost all serious speed run guys under 150mph, and with TONS of testing/feedback/etc.), and the third is a custom solid tire that’s bonded to a modified wheel. Would take some google/youtube/forum searching to come up with that info.. And obviously, you’re gonna want to get proficient at prep, truing, and balancing… Even then-you won’t get many passes out of them. And as you can imagine-at those speeds, when (not “if”) one comes apart-it’s catastrophic, and expensive..

 

[woodrow]

There are only (3) tires I know of that will do what you need. The two I listed above (ran by almost all serious speed run guys under 150mph, and with TONS of testing/feedback/etc.), and the third is a custom solid tire that’s bonded to a modified wheel. Would take some google/youtube/forum searching to come up with that info.. And obviously, you’re gonna want to get proficient at prep, truing, and balancing… Even then-you won’t get many passes out of them. And as you can imagine-at those speeds, when (not “if”) one comes apart-it’s catastrophic, and expensive..

OK, good to know. I'll probably use GRP XM3. What if i'm over 150mph?

 

[Littlemotor]

What about model f1 or drag racer tires?


Good! the only thing is , is that i'd like my tires to be rubber, not foam.
Are foam tires good for cornering?

I may have misunderstood exactly what it is you’re doing.. When you say “speed racer around 100mph”, that tells me straight line speed runs.

As for tire selection-you’re either gonna go straight, or you’re gonna turn. And not both on the same tire at that speed… Not saying it’s impossible-but you had seriously better know your shiit in order to achieve that..

When I talk about actually turning-I’m talking about a 1/8 GP pan car. None of the vehicles on this forum (Arrma, Traxxas, OFNA, etc.) would even come CLOSE to running with a kit grade 1/8 GP car. And that’s not “opinion”..

Skip to 4:20…

OK, good to know. I'll probably use GRP XM3. What if i'm over 150mph?

Like I said-step up to BSR Foam, or do some intrawebz super-sleuthing, and find the solid tires bonded to modified wheels. There are no other options at that speed.

 

[woodrow]

I may have misunderstood exactly what it is you’re doing.. When you say “speed racer around 100mph”, that tells me straight line speed runs.

As for tire selection-you’re either gonna go straight, or you’re gonna turn. And not both on the same tire at that speed… Not saying it’s impossible-but you had seriously better know your shiit in order to achieve that..

When I talk about actually turning-I’m talking about a 1/8 GP pan car. None of the vehicles on this forum (Arrma, Traxxas, OFNA, etc.) would even come CLOSE to running with a kit grade 1/8 GP car. And that’s not “opinion”..

Skip to 4:20…

Like I said-step up to BSR Foam, or do some intrawebz super-sleuthing, and find the solid tires bonded to modified wheels. There are no other options at that speed.

OK,I think I get it! Sorry if i've been vague. Let me explain. My race car should be able to corner and peform speed runs. It has a fully ajustable rear wing that can be fine tuned on the go. So I'll need some tires that can stand it.

Welcome to RCT!
Look at GRP tires. Kevlar belted & flexible wheels.
GRP TIRES

What about Firebrand?

 

[Littlemotor]

OK,I think I get it! Sorry if i've been vague. Let me explain. My race car should be able to corner and peform speed runs. It has a fully ajustable rear wing that can be fine tuned on the go. So I'll need some tires that can stand it.

Straight axle? Independent rear? Belt driven, or shaft drive? 2wd? 4wd? Center differential? Bashing? Competition? Sanctioned events, or exhibition style “fun runs”?

There are an awful lot of variables that need to be taken into consideration when choosing a wheel/tire combo. Did you watch the video? How would you compare the projected capabilities of your car to those in the video?

 

[woodrow]

Straight axle? Independent rear? Belt driven, or shaft drive? 2wd? 4wd? Center differential? Bashing? Competition? Sanctioned events, or exhibition style “fun runs”?

There are an awful lot of variables that need to be taken into consideration when choosing a wheel/tire combo. Did you watch the video? How would you compare the projected capabilities of your car to those in the video?

Straight axle, center diff, rear wheel shaft drive. It is intended to be used for bashing. I wan't it to be able to corner like in the vidio but also be able to complete 150-180mph passes as well.
As for independent rear, I don't know, what would suggest?

 

[Littlemotor]

Straight axle, center diff, rear wheel shaft drive. It is intended to be used for bashing. I wan't it to be able to corner like in the vidio but also be able to complete 150-180mph passes as well.
As for independent rear, I don't know, what would suggest?

Whew… I believe you’re gonna find that’s an awfully tall order… Have you witnessed, or driven a 1/8 vehicle that hit 100mph? It takes a LOT of room, lol… The track in the video doesn’t have anywhere close to enough real estate for that imo… Not while having room to be able to stop… You’ve also got to be able to DRIVE… Also keep in mind that track/surface is METICULOUSLY built, and maintained. There is ZERO comparison to that, and a back road somewhere, even if it’s a runway, or freshly asphalted/seal coated parking lot… Not even the same ballgame..

As with full-size Motorsports-it’s all give and take.. You can have one, but the other must suffer accordingly. Those pan cars top 85ish MPH, while still exhibiting the most impressive, and absolutely LUDICROUS cornering capabilities in the RC world (or any other world).

Just so you know-if you’re looking for that-it’s NOT gonna be on a rubber tire. Just not gonna happen lol.. And the foams they’re running are donezo after about 15min of running like that, and they’re junked, replaced, and repeat..

The vehicles in that video have been perfected over the last 40+ years with fairly unlimited funds, constant testing, the best drivers in the world, etc..

Based on what you’re looking to do; this conversation has just exceeded my pay grade lol.. To say that you’ve got your work cut out for you would be a massive understatement imo..

 

[woodrow]

Whew… I believe you’re gonna find that’s an awfully tall order… Have you witnessed, or driven a 1/8 vehicle that hit 100mph? It takes a LOT of room, lol…

As with full-size Motorsports-it’s all give and take.. You can have one, but the other must suffer accordingly. Those pan cars top 85ish MPH, while still exhibiting the most impressive, and absolutely LUDICROUS cornering capabilities in the RC world (or any other world).

Just so you know-if you’re looking for that-it’s NOT gonna be on a rubber tire. Just not gonna happen lol.. And the foams they’re running are donezo after about 15min of running like that, and they’re junked, replaced, and repeat..

The vehicles in that video have been perfected over the last 40+ years with fairly unlimited funds, constant testing, the best drivers in the world, etc..

Based on what you’re looking to do; this conversation has just exceeded my pay grade lol.. To say that you’ve got your work cut out for you would be a massive understatement imo..

Oh no! pehaps I'll cut it down a little! Basiclly all i want is a rc car that can corner well and complete very fast passes. But I need your help on weather it should be an independent rear and tyre choice.

 

[Littlemotor]

Oh no! pehaps I'll cut it down a little! Basiclly all i want is a rc car that can corner well and complete very fast passes. But I need your help on weather it should be an independent rear and tyre choice.

If it’s not gonna be ran in competition, I’d do the Indy rear. Then just run the GRP 99mm rubber tires. They’re gonna wear like crazy regardless, but will absolutely last longer than foams.. You can fine tune your compound, as they offer several. The Indy rear will help a metric ton with imperfect surfaces, and keep tuning/maintenance simple. It’s a whole lot easier to setup, and dial in a vehicle with 3 diffs, than a live axle, and locked front, or one way bearing if you haven’t been racing onroad forever imo.

 

[woodrow]

If it’s not gonna be ran in competition, I’d do the Indy rear. Then just run the GRP 99mm rubber tires. They’re gonna wear like crazy regardless, but will absolutely last longer than foams.. You can fine tune your compound, as they offer several. The Indy rear will help a metric ton with imperfect surfaces, and keep tuning/maintenance simple. It’s a whole lot easier to setup, and dial in a vehicle with 3 diffs, than a live axle, and locked front, or one way bearing if you haven’t been racing onroad forever imo.

Yup, sounds good! I'll try the Indy rear and use the GRP tyrs. Thanks for your help, RCtalk is great!
See you on the next thread!

 

[Littlemotor]

Yup, sounds good! I'll try the Indy rear and use the GRP tyrs. Thanks for your help, RCtalk is great!
See you on the next thread!

No problem buddy, good luck, and keep us posted. “build Threads” are a crowd favorite here-just so ya know.. Alllllllllmost as popular as “whatcha eating?”…