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This is a place to share knowledge related to 1/12th scale racing. It is not to be used for conversations.

Click links to go to manufacturer product page. If any are missing please add them!

Pre-mounted tires readily available in the US:
Pre-mounted tires readily available in the Europe:
  • Hot Race ??

Gluing your own donuts:
https://www.youtube.com/watch?v=hm7z1rz-74s - Special thanks to Edward Pickering!
Truing tires:
https://www.youtube.com/watch?v=8wqHOLWq6Uc - Special thanks to Edward Pickering!

The following information came from HERE, with some editing and information added. Thanks Christian!


BSR, CRC, Jaco:
Pro One is no longer selling to the public, but it and the brands above are all mounted by BSR and use the same foam. The nomenclature of the BSR vs Jaco/CRC is a little different in a few instances but is otherwise the same. The BSR foam consists of three families, and can be identifed as synthetics, naturals, and blends.

Synthetics - The old school, light weight, easy to true "dry feeling" tires. These include tires like CRC/Jaco Yellow (BSR White), Black, Gray, etc. These tires offer the highest wear rate and lowest grip. Many racers continue to use these nder high bite conditions.

Naturals - These tires are usually the best alternative for low bite and asphalt. They include Pink, Magenta, Double Pink, Lilac (BSR Team Purple), Purple, and other tires. These tires provide a ton of grip, but tend to get sticky in high bite conditions. This rubber does not wear as easily, and the cars will pick up gunk and fibers from the carpet under most high bite conditions. This is especially bad if the humidity is high.

Blends - These are the tires most people run today. They were initially called "JFT foam" by some, as it was believed that the tires were the same as the JFT tires. We can divide the blends further into two groups: high rubber and low rubber content. The high rubber would be the new rear Orange and Red from the BSR family, and the low rubber would be the Green and Blue varieties. When, asked about the difference, John Foister from BSR Tires said they came from the same "family" of foam, but they offered different grip. According to John, the Green/Blue has more bite than Orange/Red, but from track testing Oranges offer more bite than Green (being equivalent to in hardness) when the grip is high and absolutely no grip when it is lower. The Orange foam has a denser pore structure and the tire is not as prone to chunking. It is also important to note is that BSR Blue rears are not the same as the BSR Blue fronts!

JFT stands for Japan Foam Tire. They started the new wave of foam tires we are all using now (Blue/Blu, Green/Greene, Dbl Blue, etc). These tires are a little different than the BSR tire family, but work in very similar conditions. They offers four varieties A (asphalt), C (carpet), S (???), and R (???). This does not mean that those types only work on that surface, but this is what they recommend.

JFT uses the same foam for fronts and rears if the color is the same.

A: Used on asphalt, considered close to the natural rubber variety and are named consistently with other natural tires.
C: Used on carpet, considered a blend.
S: Used on carpet?, tires are ???
R: Used on carpet?, tires are ???

For setup, the JFT foam seem to generate more bite than the BSR, therefore the car tends to be a little more aggressive.

Ulti is another Japanese brand that offers an array of compounds. They have their own way of rating tires, and are difficult to equate to other brands. They have 4 different varieties, each in varying degrees of hardness.

J: High rubber content tire, similar to Pink/ Magenta. Soft would be close to a pink. These offer the most bite and are great for asphalt/carpet front tire. (J hard being very popular)
X: "Balanced" blend, similar to JFT Blue/ Green. Soft is equivalent to Green, medium to Blue in hardness. Great for carpet!
Y: High synthetic blend with lower grip, and is not a very popular variety.
Z: A very expensive "special" foam that is supposed to be magic on asphalt. Only make it in soft shore.
European tires:
There are many great European foam tire brands that use their own types of foam, as well as traditional foams. SOmeone with more knowledge about them will need to fill this in!

Tire Diameter:
If you are racing on carpet, you have to evaluate how much grip your track has. If your track is low to medium grip, you can run bigger tires. If you are on higher bite you have to cut them smaller, there is simply no way around it. Bigger tires are needed for asphalt, especially in the rear. The larger tires provide much needed lateral bite.

Carpet (mm):
Low - Medium Bite
Front: 42.0 - 42.5
Rear: 42.5 - 43.00
Medium - High Bite
Front: 40.5 - 41.0
Rear: 41.5 - 42.0
Big Race
Front: 39.5 - 40.0
Rear: 40.5 - 41.0
Asphalt (mm):
Parking Lot
Front: 43.0 - 44.0
Rear: 44.0 - 45.0
Prepped High Bite
Front: 42.0 - 43.0
Rear: 43.0 - 44.0

Tire Saucing:
Most facilities have moved towards odorless traction additives such as SXT. Some of additives evaporate very quickly and some do not. This seems to be something that is also dependent on tire compound and ambient temperature. For example, saucing a Green compound seems like it never dries, especially when tjhe temperature is lower. We have found that wiping the tires off 15 minutes before we go run allows the sauce to cure, which makes the car come in much quicker with Green rears. Blue compounds on the other hand, do fine when wiped off right before hitting the track.

Saucing half front and full rear is a good initial starting point. If the front of the car is too agressive you can sauce les than half, or for a shorter amount of time.
Tire Fuzzing:
In conditions of increasing grip, foam tires will somewtimes get sticky and pick up fuzz and debris from the track. This is highly dependent on the rubber sedan tire that is being run at your local track and the compound/ type of foam you are running on you car. The softer the sedan tire and the harder/higher rubber content in your foam tire, trouble with fuzzing seems more likely to occur.

There are ways to get around fuzzing under most conditions, and usually involves the selection of the correct foam compound. The more fuzz you get, the softer/lower rubber content you want to run.

Problem: Car fuzzes with Lilac/Team Purple fronts and car starts pushing.
Solution: Use a softer front tire and or different family of foam. Replace it with Blue or Double Blue front.

Problem: Car loses rear bite 6 minutes into the run. Blue rear tires look almost clean but have small carpet hairs.
Solution: Use Green rear tires. The softer compound wears instead of getting sticky, minimizing fuzz.

Tire Selection:
Starting out, pick 2 tire compounds for the front and rear. The following should have you covered 99% of the time.

Front - Green and Blue (BSR) or Green and Light Blue (JFT)
Rear - Blue and Double Blue (BSR) or Blue and Dark Blue (JFT)

You may wonder about other compounds out there and if they might be better, trust me, they probably won't be. Even if there are other tires that can be as fast, the synthetic family wears out really fast and the high natural rubber will probably fuzz on you over an 8 minute run. The blends family seems to be the most versatile foam type available today. They last awhile, and sticking to them will make your process of tire selection simpler.
Tire Charts:



JFT (Japan Foam Tire)


Enneti (Xceed)

As of now, ROAR is staying 1S (3.7V nominal; 4.2V fully charged) for 1/12. There are many 1S ESC's with a built in BEC so nothing else is required to power the receiver and servo.

If you don't want to lock yourself into a 1S specific ESC, you do have other options! It is possible to use your 2S ESC without a booster or receiver pack, and the ESC simply supplies the lower voltage. If that does not appeal to you, you will need to use an Rx pack or booster. The Rx pack and booster will both supply the receiver with a higher voltage than the 1S pack.


If you choose to use a voltage booster, it works exactly how it sounds. Instead of plugging the ESC into the receiver, it plugs into the booster, and the booster plug goes to the ESC, supplying the higher voltage.

If there are any missing please add them!!

If anyone would like a need for a chart comparing the ESC's specs PM fenton06 and I'll get one made and put in here!
Voltage Boosters:
If there are any missing please add them!


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Old 02-04-2002, 08:19 PM   #481
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how about the JR z3035 give your feedback trips
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Old 02-04-2002, 11:10 PM   #482
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Originally posted by Super38
how about the JR z3035 give your feedback trips
Sorry, I'm not familiar with that servo.

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Old 02-06-2002, 09:45 PM   #483
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Default zr3550

This is my favorite servo for 1/12th scale and JR's cust. service is awesome. The resolution is awesome and it has good speed and very good torque. Even though the gears are plastic they hold up very well when used with a Kimbrough servo saver and they even have an internal cenetering pot (use a small jeweler's flat edge) inside of the spline shaft.

Last edited by darnold; 09-12-2007 at 06:10 PM.
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Old 02-06-2002, 10:26 PM   #484
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Dave S- This is Dave Arnold from IL, how are things going for you and the rest of the gang up there? I heard Greg Amendola is out for a while and Yari has fallen off the planet. I think I better call them both. LOL

Drifter- In mod racing we normally use 1.72"-1.68" fronts (purple) and 1.90"-1.83" rears (gray) for carpet. Aspahlt= 1.76"-1.72" fronts (purple) and 1.98"-1.85" rears (pinks)

Dragon Slayer- Normal setup is thick T-bar (.072-.078") regardless of stock or mod. The more the bite comes up the thicker the T-Bar. If you dope the entire rear and inside 1/3-13/4 of the front you should have little problem with grip. You WILL notice a HUGE difference in corner speed with the thick T-Bar. The thin T-bar is used for aspahlt for much needed extra rear grip.

Sponge Bob- Try RC4less. They have great prices on BSR Foams for 1/12th scale but make sure you check them upon receipt for quality.

Taz-S - For that person that asked the answer is that 1/10th has different wheel diameters and the "normal" size of new glued & trued foams from Jaco and TRC are: 1.90" fronts and 2.20" Rears (which are huge and not for competition on carpet but they can be run anyway so you don't HAVE to have a tire tuer)
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Old 02-06-2002, 10:50 PM   #485
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doooohh- Should read "asphalt"

vodo321- I just switched to the new 02 edition of the Trinity car. One of the nice things about the Trinity cars is the "revolver" front end (the one with the multi-links). This front end is the strongest and best performing front suspension out I think. By putting on different height balls studs you raise and lower the roll centers and can vary the amount of "reactive caster". By putting the back and front links into different holes you can vary the camber gains.
I would try medium ball studs at all four points with a .30" shim under the back ball studs. On the front ball stud use the inside hole and on the rear use the outside hole so that the arm is parallel. Set the camber at -2 degrees and the caster at 3.5 degrees with .020 ASSOCIATED front springs. If you are using trinity's front springs then use .022's because the trinity front springs are softer because they are wider so an Associated .020 roughly equals a Trinity .022. If you use the Associated front springs turn the lower arm ball studs upside down so that the lip isn't facing down towards the spring so that the Associated springs will fit because they are also a little longer. Use one washer underneath each of the front suspension mounting points. This should be good for fronts from 1.74"-1.66" if they are bigger you might want to use two washers at each mounting point up front. For damper lube use Trinity Red Stuff or Hydra Fluid Light(Losi). Thick T-bar (the Associated T-bar will work) and if your rear tires are bigger than 1.95" use the #2 axle cam down. For rears at 1.95" - 1.85" use #1 down and for 1.85"-1.80" rears either #1 down or #4 axle cams down. Purple fronts/Gray rears. Dope the entire rears with Paragon or TQ8 and dope the fronts from the inside out starting with 1/3 - 1/2. For stock carpet let the traction sit for 15min if traction is good and 20min if it only decent and then wipe off with a rag before you go out. For mod let sit for 25min and then wipe off. At big races where there is a black groove and traction is really high (so that cars want to tip over or "traction roll") only dope your tires for about 10min and sometimes 15min but usually not more.
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Old 02-06-2002, 10:57 PM   #486
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vodo321- clarification point: I actually meant that if you use the Associated front springs the plastic front suspension delrin balls that go into the upper and lower arms must have the lower ball turned upside down so that the "lip" on it is facing up towards the top arm to give the extra clearance for the slightly longer Associated front spring. Also if your kit didn't come with the Associated VSC shock that is in the 12L3 kit then you might want to get one and use it ($15). Start off with 30wght in the shock and for extra rear bite use the Associated silver spring with medium pre-load or the blue spring with light to medium pre-load. For bumpy tracks try the Associated off green spring with medium to heavy pre-load.-Dave
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Old 02-07-2002, 12:42 PM   #487
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darnold: good to have you on board and hope you stay with us to help grow 1/12th.
Jake's Performance Hobbies http://www.jphracing.com/
https://www.facebook.com/groups/757500284356171 Facebook Group for Pro 10
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Old 02-07-2002, 02:24 PM   #488
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Dave, didn't you used to run the 6 pack?
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Old 02-07-2002, 03:57 PM   #489
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Darnold.....welcome aboard...thanks for the reply......We just started running on Ozite and its great........I'm currently running an older assoc. RC12LW.....with the .063 t-bar...Purple fr. and Pink rr......going to Gray rr......someone told me that the Pinks scrub too much speed......020 front spring..new style front end....For an older car, it has really surprised me as far as how competitive it is...I'm running against new CRC's and 12LS's and i'm 4 seconds behind the leader(crc)The CRC driver is no slouch either....he always places high wherever he races.So I'm pretty happy with my 12LW.......another question for you.....on another board someone talked about putting a washer under the front t- bar pivot..but never said what it did.....what does it do????????I never got to race 1/12 when it was big...but i'm glad its making a comeback...prolly my favorite class....8 minutes of no blinking.....
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Old 02-07-2002, 04:04 PM   #490
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Dragon Slayer- Elevating the T-bar to an incline position from front to rear will give more initial turn-in to corners. When running mod you usually want to run a .007" - .015" washer under both balls so that the T-bar doesn't hit the chassis as it flexes which would cause the car to snap steer and be less stable. So putting a slightly thinner washer underneath the rear ball vs. the one under the front will still give you some more initial turn-in and help keep the car more stable and consistent.
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Old 02-07-2002, 04:07 PM   #491
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SpongeBob- Yep, I just switched about 3wks ago, right after the January Jam race to the new Trinity 2002 car.
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Old 02-07-2002, 06:02 PM   #492
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Ahem, excuse me Dragon, I run a 12L3 not a CRC car. Just thought you'd like to know.

So David, how's racing up at Leisure? I'm moving up that way soon and would like to get mondo track time when I get there. You know who I am, you just don't know my name, I'm at Cleveland every year. Bleached blonde hair, I hang out with Sean, Steve Lafara, and Skip. Guess who I am yet?
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Old 02-07-2002, 06:38 PM   #493
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mod brushes?

darnold-what are good bruses/spring combo to use for mod 1/12th?

I also race in Minnesota. I haven't seen racing, just mainly making a few appearence hear and there, I don't know what happened. As for Yari, I don't know either, although I don't really know the guy and am new to the world of 1/12th scale, let alone mod. I chase Mitch, Jeff, and Joe Z just about every saturday.

One more question, is there a conversion kit to go from a 12L3 to a six pack? I figured you might know since you used to run one. thanks.

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Old 02-07-2002, 06:41 PM   #494
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Hey dude what's up? I know who you are, when will you get here and where will you be at? (Joliet, Romeoville, Bolingbrook, Naperville, Lisle, Downers Grove) Leisure Hours for on-road is gone but we race at Venture which is a really nice track. It's up in Libbertyville about 1hr-15min away from me. Practice is Mon, Tues, Thurs, Fri. 5pm-10pm @ $5. Race Dates are Wed(5pm-10pm), Sat & Sun(12noon-practice, start at 4pm) @ $10. Venture is good bite, fairly smooth and nice and warm with a good hobby shop on site. I am actually planning on going up their tomorrow nite and maybe sunday. Classes usually are 12th scale (stock/mod run together if there aren't enough for seperate classes) and TC rubber stock and foam stock and sometimes rubber or stock mod. They also will do a 1/18th HPI class. So get that 12th scale up here. You can reach me at my e-mail and we can get stuff setup.-Dave
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Old 02-07-2002, 06:48 PM   #495
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petenis- Hey how are you doing? It depends on what you want from your mod's. If you want the fastest racing brushes then I would recommend Integy 6% silvers or Trinity 4383 but then you will have to cut your comm every 2 runs and re-serrate the brushes. That should get you about 8-16 total runs before you have to throw them away. If you want good power, less maintenance, and a little longer life then I would run Integy 3% silvers or Trinity 4830.
What mods do you run?
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