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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!
Black Art (CRC - US Dist):
  • Audi R8C - BA002 - .020 Thick

  • Black Market (Mohawk 12) - BA005 - .020

  • Lola B10 - BA006 - .020 thick
  • Toyota TS030 - BA008 - .020 thick

    Lola - black/red, TS030 - green/pink


Reflex Racing/RSD:


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Old 10-22-2003, 03:32 PM   #4516
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1. 80 weight and a Speedmerchant black or CRC red (the stiff one), its basically a 17lb sprng

2. Rear: 1.87-90 and front 1.8-3

3. Protoform ascari (more steering, longer lasting) or the Parma Speed 9

4. Reedy 676's or Trinity E-brushes w/ two green springs
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Old 10-22-2003, 03:44 PM   #4517
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Thanks so much for the info Stormperson.

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Old 10-22-2003, 03:59 PM   #4518
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Default IRS Axle Question

I am setting up my IRS large D ring axle. I am using a Kimborough spur gear. Is it normal for about 30% of the bearing to protrude from the D ring? What I'm saying here is that the O.D. of the D ring is like .750 and the major diameter of the bearing holes in the spur gear is like .812. It seems that a lot of crud could get in the bearings. Help me out here guys.

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Old 10-22-2003, 04:06 PM   #4519
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The balls in the spur should ride very close to the outside edge of the diff rings. Yes crud can get in there. I suggest cleaning the diff after every run. Takes about 10 minutes to tear it down, clean the parts and build it back up.

You can also get snap rings that will cover the diff balls. You'll see oval guys do this.
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Old 10-22-2003, 05:23 PM   #4520
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where in Pitt, are you gonna race, I will be in town later this winter for a while

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Old 10-22-2003, 08:19 PM   #4521
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Default Racing in Pitt

Casey....we race in Beaver PA, its 30 mins north of Pittsburgh. We run roadcourse on Saturdays. Doors at 1, racing at 3, pizza at 4:30

Its called River Junction Hobby Shop
Here's the Address and phone # so you can map it out.

1216 4th Street
Beaver PA, 15009

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Old 10-22-2003, 08:20 PM   #4522
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speedxl, Thank you for the info! I have just purchased the sx9 and two airtronics 94145 servos.
I run a v7.1 in my losi xxx-t MF and It has held up well. There are a few guy that I have talked to about the quantum but they had all fried them and were not happy.

Originally posted by speedxl
grump i have used the lrp speed control
(quantum ) in twetlh scale and its ok but hands down the gm sx-9 speed control is a better choice for 12 scale not just the size but it has more punch feel especially
in stock really good for 19t it feels like a mod. i have nothing but praise for the sx-9
it got me in the a main at the nats since then i even went to gm speed controlers in my sedans aswell. v12 wsc edition.
i put my lrp 7.1's in my box for spares
the gm's have more punch.
and your choice for servos the airtronics
9145 is perfect . its more than adecuit for the job.
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Old 10-22-2003, 08:23 PM   #4523
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Default Integy tire truer

Does anybody use this tire truer? I was wondering if this is a good truer. At $119.00 It is tempting. Any comments!!!
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Old 10-22-2003, 08:26 PM   #4524
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Stormperson, Thank you for the info, believe me I am taking it all in. before I know it I may end up with 2 or 3 cars?
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Old 10-22-2003, 08:29 PM   #4525
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Sands, I may try the KO, but for now I found good deal on 2 airtronics 94145 servos, Thank you for all the info. I am finding this forum a great asset.
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Old 10-23-2003, 12:59 AM   #4526
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stormperson: Thanks
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Old 10-23-2003, 03:51 AM   #4527
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grump- integy stuff normally doesnt last very long, so I would not exactly suggest it. I personally used the ofna automatic lathe and it was just over $200, and I couldnt be happier, it was defently worth the money.
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Old 10-23-2003, 04:20 AM   #4528
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Servo flat or angled?

What the advantage / disatvantage of either way.

I'd like to try an ascari body and that will require a flat servo (so it looks like).

any differences in steering response?

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Old 10-23-2003, 04:56 AM   #4529
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xxxgrumpxxx: I'd like to know about the Integy Tire Truer also. It seems to me, that if its individual parts are "square", the motor shaft and arbor turn true, and the cutter feed is smooth it would make for a good truer.

Last year, I sold all of my R/C Equipment (thinking that I was getting out). Anyway, among the items I sold were my Hudy Tire truer (universal), and my Hudy motor lathe. They were both excellent examples of machinery.

Well, I just took a chance and bought an Integy Xipp X-Mod Super motor lathe, and it is every bit as good as the Hudy I owned if not better. It uses a secondary shaft to turn the armature rather than turning the armature with the motor shaft. This secondary arm eliminates the vibration caused by the motor shaft. I'm overjoyed that I bought this lathe even though I had not seen one in person. Best of all, it cost about $60 less than the Hudy, and the Hudy doesn't include a bit.

If you can, check out the Integy Tire Truer before buying one then let us know. If I can find one, I'll report back.
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Old 10-23-2003, 04:58 AM   #4530
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You can still use angled servo mounts with the Ascari body. The first batch of bodies did rub on the servo saver but they have added some height in the front end to ensure it fits without any problems.

By the way, does anyone have a brush/spring combo for a 19turn Chameleon 2 for my Rev 3?


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