BIG! tires for your RC car (RC Basics #7)
If you have an rc car – and hopefully you do otherwise im – not sure why youre watching this channel, but if youre into rc cars, if you have one and if you bought one one of the first things you probably think about when you get an rc car, Is well, you know what this car could use. Some bigger tires right. Everyone loves big tires, whether youre driving a monster truck an on road vehicle, a race car. Whatever you know, everyone loves big tires. Someone really goes with smaller tires. They buy a car, and the first thing they think is lets get some bigger tires, and so it may seem like kind of an obvious thing right: theres, not a whole lot to think about. You just buy a tire make sure the hex is the right size and just bolts it on what is there to think about, but theres actually a fair amount of things to consider uh to be aware of when you buy bigger tires. I just want to cover those were going to talk about 10 different things to be aware of when you put on some bigger tires on your rc car im. Pretty sure some of these will surprise you and be things you probably didnt think about so hopefully this helps out. What we got in front of us is the traxxas stampede four board forever vxl. I got the stock wheels on the back. These are just some talon tires and wheels that it comes with now on the front.
Actually, it has some aftermarket wheels. These are actually rolex wheels and i forgot the name of the tires chopper tires. I believe something like that um that they no longer make, but these are some bigger tires on the front. You can see that theyre a little bit different size stock, tire and the bigger rolex wheels and chopper tires on the front so lets get into it. First thing to realize, when you put on some bigger tires, is that obviously, that theyre, bigger theyre going to have a you know longer diameter a little bit taller profile, uh, obviously a longer circumference as well, and then you can kind of see a stock tire. So what does this mean in terms of gearing? Well, you definitely will want to change the gearing if you just run this out of the box, depending on how big of a tire you put on youre generally going to overheat the motor its going to be a lot more of a taller gearing than what it Came with so something i definitely recommend doing is kind of doing some simple, math, its not anything complicated. You basically just take the diameter of the original tire. You know you just kind of measure out lets say its like five inches or something, and then you take the diameter of the bigger tire lets say its like six inches, its not actually six inches in this case. But you just do some simple math in this case, five, six right smaller tire over the big tower is five six and you multiply that times the original opinion gear on the motor.
So you you want to start with basically the same rollout or the same gearing that you would have with the original tires. All these rtrs are basically designed for a certain size, tire in mind and when you go with a bigger tire, your gearing is going to go up higher its basically going to be under geared a little bit or im sorry over geared a little bit. So just do some simple math, so in this case, for example, 5 6. Maybe you have a 24 tooth pinion gear thats the gear on the motor. You just multiply lets say: 24 tooth gear times: five six, you know with 20 tooth. So, just to start out with, i highly recommend just changing out your pinion gear to that same ratio. So in this case lets say a 20 tooth pinion gear, throw that on itll keep the exact same gearing as you had before its nothing too crazy. No crazy! Math or anything like that, but um thatll keep the gear ratios the same. If you run it, as is with a much bigger tire, youre, basically going to be overheating, the motor its going to be geared up too tall its going to accelerate a little slow, and this just kind of is a good place to start now, once you kind Of get a baseline do some temp checks and stuff on your motor make sure its driving okay. Then you can kind of play with the gearing either up or down, depending on what you want, but yeah thats something thats, pretty much important to do out of the box, even just bouncing on simple tires like that.
Putting on big old tires, you do want to adjust the gearing to match. Next up is something fairly basic, but something again a lot of people are not aware of, and that is once you put on the bigger tires youre going to obviously lift the truck or vehicle off the ground. A little more. Its going to have more whats called right height, its going to be higher up off the ground, but one thing you want to make sure is that the chassis can still touch the ground when the suspension is fully compressed. So obviously, so when you compress the shocks all the way make sure that chassis can still touch the ground, you want to be able to hit the ground with the chassis. I know it seems kind of counterintuitive that you want the chassis to hit the ground. You know a lot of people think that noise is really annoying when you slap the chassis. But the reason you want that is that you dont want the shocks to fully compress all the way and not be able to touch the ground. And the reason for that is that these shocks are, you know, generally pretty wimpy little things. They got little three millimeter screws up top. If you dont allow the chassis to touch the ground, the shocks are going to take all the forces of that impact. When you do a giant jump or whatever, when you jump it like 20 feet high land on the ground, these shocks compress all the way and if the shocks compress all the way, the chassis doesnt touch the ground.
Well, youre going to put all the forces on the shocks themselves: youre going to end up bending shock, shafts youre going to break rod, ends youre going to pop off the shock caps youre going to bend these little screws theyre going to pull out of the arms Lots of bad things will happen when the shocks basically have to take all the impact and theyre like fully compressed and cant go anymore. So really simple thing just throw on your tires. Make sure you can press the vehicle all the way down to the ground. Even have a little more extra give is a good idea, because these foams compress these tires compress itll, actually go even further than you think, or you might not land completely flat. You might land on one corner. You know a little flatter than the other, so yeah something to check is to make sure your chassis still touches the ground with those bigger tires. Number three on this list is to make sure the tires. Dont rub the body well youre. Looking at this car, like okay, the tires are not rubbing the body whats the big deal. Well, one thing you want to make sure you do is turn the tires flat: full right, compress the body and what you may see is actually the tires rubbing the body, and these tires will not only rub the body you know at full compression, but also when Youre going really fast, the tires balloon a little bit right, theyll expand a little bit due to centrifugal force and even though it might not touch the body uh, you know just driving in a straight line or whatever under power at full.
Lock. You may find the tires of rubbing the body, so if its not rubbing too bad, maybe just leave it like that. Maybe you trim the body, but something to be aware of youll hear this like nasty scraping noise when youre doing especially like in the air on full power, with the wheels turned thats when youll notice that the most with the wheels turned on a lot of power. So something to double check on your vehicle make sure the tires. Dont rub the body, especially at full, lock, especially at a lot of power and youll want to. You know check it through the suspension travel because thats how your vehicle will be driving number four on this list is to check that your endpoints still match correctly, with different tires with different wheels. Maybe you have a different offset of the wheel, just check your endpoints, and hopefully you know what check endpoints means. That is when i have a lot of videos on how to set your endpoints, but what that means is basically setting where your servo fully extends to both left and right, making sure the wheels dont rub against the arms thats. Something that may happen tires might rub against shocks. Steering links may rub up against the tires here, so a lot of different things can hit once you put on different size tires and wheels and setting your endpoints is critical both to make sure youre. Not you know damaging that serial by trying to over, extend both left and right endpoints, but also that youre not rubbing or hitting things on your wheels and tires with those bigger tires and wheels on there.
Next thing to be aware of, when you buy different wheels and tires, is to make sure you get the right inner diameter for one tenth scale: trucks, uh theres, a couple different sizes, its generally 2.2 2.8 and possibly 3.8 inch wheels thats. Basically, the inner diameter of these things, you want to make sure you get the right wheels that will actually clear the steering on the fronts most sort of 10 scale. Traxxas vehicles or armored vehicles are going to use like a 2.8 inch wheels, something a little bit bigger like a max is going to use. Maybe, like a three point, inch eight inch wheels to basically clear all those steering components, those knuckles all those hubs. In the front end, so just make sure you get the right size wheels, its really simple and easy to do. Just you know sort of measure the stock wheels that come on your vehicle. For example, this one is 2.8 inches, so you want to at least get a 2.8 inch wheel when you mount it onto this vehicle, but getting the right inner diameter on your wheels is critical, just to make sure that they all fit on your rc car number. Six on this list is to realize once you put on bigger, tires and wheels. Obviously, theyre going to be heavier theyre, probably going to have a little more traction, theres a lot more friction on the ground, because theyre wider theyre rubbing against the ground a little bit more.
And so what to be aware of is that your servo may need to be upgraded. So something like this: the traxxas 2075 plastic gear servo, not particularly strong. I think its got 125 ounce inches of torque. These things are basically the cheapest servos that the manufacturer can get away with with the stock tires, so theyre designed to work with the stock tires once you go with a bigger tire, bigger size, a little bit heavier your servo may end up actually not being able To turn those tires and wheels with authority anymore, you know they may kind of drag. They may turn like super slow. They may not even be able to turn the wheels all the way. So something to be aware of is once you put on the bigger tires. Its probably worth it to get a better servo. These things are barely adequate for the stock tires and with the bigger tires you know, theyre generally going to be super weak uh, not only just the servo, but also the servo saver, so on this particular vehicle, its got a servo saver built into the steering system. These things again are designed to basically save your server thats, why they call the servo saver theyre, basically designed to give, if theres any sort of excess force on the wheels and tires, and they generally have like a really light spring and designed to save that. You know really cheap servo, so once you upgrade the tires, you probably want to upgrade the servo and maybe even upgrade the servo saver as well, either using a stiffer spring or an aftermarket part, or something like that.
Otherwise, you may find that you know you got these new tires, maybe have more traction, but they dont really seem to steer all that well and a lot of that is going to be due to either the servo or the servo saver. So something to be aware of with bigger, tires and wheels number seven on this list is to check the offset of the wheels that you buy. Probably youre gon na buy the same size wheels, but they do make different whats called offsets, and that is basically the spacing of the hex from the outside of the wheel. So different manufacturers have different offsets different wheels. That kind of thing, for example, a lot of the monster truck uh 10th scale monster truck wheels come in either what they call a zero offset or a half inch offset. For example, if you buy proline wheels uh in general, you know you want to make sure youre getting the right offset to match your vehicle, for example, the stampede 4×4. They use. Basically, the half inch offset, which is the same as the stampede front, wheels on the two wheel drive, but other vehicles may use like the zero offsets. So, for example, the rear wheels on a stampede two wheel drive uses the zero offset so check the offset. If youre not sure, i would go with a little bit wider wheel that way, youll have make sure you have enough clearance uh, that your wheels arent, you know, tucked in too tight.
That would look really weird and probably not drive, particularly well. So, whenever youre buying wheels and tires make sure youre buying the right offsets, most of these, like pre mounted, tires, come with a particular wheel that has a different offset. You want to make sure you buy the correct size following along with wheel. Offset is something called tire scrub and im not going to get into all the whole physics of this or whatever, but there is some downside to getting some super wide offset wheels. If you pull the wheels out, you know a lot more than the stock wheels. As you can see on this vehicle, its slightly wider in the front than it is in the rear, so i do have a little more positive, offset a little more positive tire scrub as well on the front tires and theres something called tire scrub or tire scrub. Radius, im not going to explain the whole thing, but the basics of that are the wider. You make the wheels generally. The less steering youre going to have. The vehicle is obviously going to be more stable, less likely to roll its going to have a wider track. Width, but the downside of having all that with is its not going to steer quite as well theres, something basically called like a zero scrub uh, where the tires are in line with. Basically, the pivot points on the spindles, the further you get away from that, the more tire scrub you have unless its actually going to steer theres going to be more friction, more resistance and actual turning.
So there is some downside to going like super crazy wide offset wheels. You know a lot of people put on like 17 millimeter, uh axle, stubs or whatever and like mount these things like super crazy white out, and then they find that their car doesnt actually turn. So there is some downside with going all crazy with the width. You know wider is not necessarily better just something to be aware of. I try to keep. You know generally wheels that are pretty close in offset pretty close in tire scope as these stock wheels. I think thats a good place to start just something to be aware of dont, always go with the crazy offset wheels. The last thing to realize, when you mount on bigger, wheels and tires, is that theyre going to be heavier than your stock tires. So you may wonder: well what does that actually mean? Obviously, with the wider diameter of these tires, you want to gear it down again, with the heavier tires youre going to notice different things generally, its going to put more strain on your motor, its going to generate a little more heat, its going to accelerate. Actually, a little bit slower if you have the same, gearing its also going to slow down a little bit slower because theres more rotating mass, that you got to try to slow down. And the last thing is to realize that, in the air the bigger heavier tires are going to rotate the car more so youll be more easily able to do backflips front flips.
All that thing, the bigger and heavier the tire are the more easy it is to do: flips and tricks in the air. So, if youre looking to do a lot of stunts and crazy jumps and send its and front flips, all that kind of thing bigger tires will help but be aware that they will generally be at the expense of heat youre, going to find the car a little Bit slower, depending on how big of a heavy tire you put on and itll, also slow down a little bit more and generate more heat, so anyways thats, it 10 little things to know about your rc car. When you put on giant tires. I hope this video was interesting. Useful entertaining dont forget to hit the like share and subscribe buttons.