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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 10-03-2002, 04:51 PM   #1546
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Hello all!

It's been quite a while for me on here. Been busy with nitro and so on. Looking forward to carpet, I should have my car ready by this time next week.

Now for some answers.

Seamus, for your front tires try this. Hold the tire against the arbor so that the threads are resting on the "ribs" inside the wheel. Switch the truer on in the "rounding'' direction, (when the wheel turns away from you so you can round the edges) The wheel will thread itself on and rest against the stop on the arbor. I figured this out last year at Cleveland after doing three sets the old way and getting tired of twisting them myself. Much faster and easier!!

For all who are ordering the Yokomo car. Remember that this car was designed for the last worlds which was on asphalt. Masami stretched the slots towards the rear of the car for more rear traction. The chassis is also thinner and made of a more flexible carbon fiber plate to again improve rear traction. This will not make a very good carpet car, TOO MUCH FLEX!! How do I know all of this, I'm friends with Sean Cochran, team manager for Team Associated and he gave me the inside info on the car when I first saw it. You asphalt racers and no tire compound racers will probably like this car a lot. Us rug munchers will not care for this one much at all. Can you just imagine how this car would twist at Cleveland in the third round of qualifying!! Yikes!!

Enough for now. Everybody stay fast!!

Futaba, O.S. Engines, Tornado Fuel, Schumacher Racing, SpeedPassion USA, Eggroll Inc., Desoto Racing, Vesselli Racing
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Old 10-03-2002, 06:37 PM   #1547
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Socko - I concur with your Yokomo analysis. Now it is time for you to practice.
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Old 10-04-2002, 05:38 PM   #1548
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Hello 1/12th ers,i was wondering if people fine tune there diffs.?.i generally just tighten it up until the spur stops slipping,but have never messed around with it,but then ive been thinking.whats the point of the diff if i only tighten the spur up,
can any one help

Team Corally U.K/Modeltech-u.k-RC-LAB-7-

Last edited by Stevie; 10-04-2002 at 05:46 PM.
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Old 10-04-2002, 09:10 PM   #1549
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hey davidl how do you like mays landing i have family right up the road from you in egg hobor township are you going to travel back to mimi's (the track) any this winter. she told me she was going to talk to you to see if she could get a carpet regional. i think van wag is going to be race director this year after taking last year off any way good racing to ya
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Old 10-04-2002, 10:18 PM   #1550
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Ah, yes Mr. Lee. I am getting to it as we speak, er, read, oh well you know what I mean. I've got the race shop running full tilt right now with a few tweaks for my L car. Nothing major, just a few ideas I have. I'm still thinking on the Rev 3. Just don't know if I would like the car in mod trim. I know my old Knife didn't like mucho horsepower at all.

Guess everybody else is at Oktoberfast. Wish I could be!! Just means I'll have more practice time for Cleveland!!

You going to run Master's Taxi this year too David? I don't remember if I ever saw you run a touring car.
Futaba, O.S. Engines, Tornado Fuel, Schumacher Racing, SpeedPassion USA, Eggroll Inc., Desoto Racing, Vesselli Racing
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Old 10-05-2002, 10:25 AM   #1551
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Socko...whats up bro....racing has been slow down here...but Shreveport did get the Carpet regionals....warmup race on Nov. 2nd. and regionals on Nov. 8th./9th.
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Old 10-05-2002, 02:05 PM   #1552
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Well, well....

Hey Dragon. Not much new here. Regionals eh, I may have to make a trip down there if work allows. I'm surprised you guys aren't racing boats now with the hurricane and all. I would think that things will pick up for you now that it's getting cooler. Are you coming to Cleveland? I'll be there for sure! Got my room already and everything.
Futaba, O.S. Engines, Tornado Fuel, Schumacher Racing, SpeedPassion USA, Eggroll Inc., Desoto Racing, Vesselli Racing
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Old 10-05-2002, 07:09 PM   #1553
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Socko....negatory on the Cleveland......bunch-o-stuff came up.....may make Snowbirds......
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Old 10-06-2002, 09:53 PM   #1554
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Just in from Oktoberfast- Race summary monday.
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Old 10-06-2002, 11:05 PM   #1555
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Default Results from Oktoberfast

1/12 Mod A-Main
1) Josh Cyrul
2) Mark Adams
3) Mike Pulpher
4) Mike Blackstock
5) Chris Doseck
6) Mo Denton
7) Mitch Whitteman
8) Jari Taskila
9) Dave Arnold
10) Woody

1/12th Stock A-Main
1) Mike Pulfer
2) Kyle Gannon
3) Timmy Heiser
4) Mo Denton
5) Scotty Ernst
6) Fred Kellner
7) Rob King
8) Jody Flipse
9) Skip Crain
10) Jimmy Casey

1/12th Masters
1) Bill Jeric
2) Woody
3) Lee Harpe
4) Chuck Lonegran
5) James Arnold
6) Rick Worth
7) Mark Litchenberg
8) Jeff ford
9) Tom Esposito
10) David Fontanetta Jr.
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Old 10-07-2002, 01:24 AM   #1556
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Congrats Darnold on the A main. This is Terry from SWR.
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Old 10-07-2002, 04:10 AM   #1557
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I have a questuion on bodies. I just bought a used 12L, but I need a body for the car. What do you guys recomend for an on-road body.
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Old 10-07-2002, 07:11 AM   #1558
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I just tried the Parma Speed 8 body. I didn't really care for it.

I'm going back to the Protoform Nissan P35.
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Old 10-07-2002, 07:39 AM   #1559
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way to go PULFER, WOODY, MO.
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Old 10-07-2002, 01:49 PM   #1560
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I like Protoforms Speed 8 LMP body better than the Nissan.
Proudly driving for RC Pitstop
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