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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 06-16-2005, 05:56 PM   #13351
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Originally Posted by odpurple
Thanks, that's an old photo, from before we started routing the wires to the bottom of the motor. I'll re-spec that car before the Vegas race Right now we're running on asphalt, so it's been the Yokomo and the H12.
I was wondering if you had gone back to routing the wires on top instead of the bottom...Had me fooled...Again!
Constantly evolving CRC WGT and WGT-R/T...Carpet & Asphalt...All thanks to Team CRC.
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Old 06-16-2005, 07:26 PM   #13352
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what kind of blocks are on the rear pod of the car you just posted? And of course where do you get them?

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Old 06-16-2005, 07:47 PM   #13353
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Originally Posted by kevikevtmc
what kind of blocks are on the rear pod of the car you just posted? And of course where do you get them?

The Q12 has Niftech motor blocks.

Edit: sorry, forgot to tell you how to get them. you could try to get your lhs to order them, but calling Niftech direct is the best way. www.niftech.com for the phone number.
He hasn't made any blocks in a long time, doesn't want to, but we have been nagging him to do so. Simply because the Niftech blocks are the strongest available. They are made from 7075 aluminum, which is much stronger than the 6061 used by everyone else.

Last edited by odpurple; 06-16-2005 at 09:58 PM.
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Old 06-16-2005, 09:05 PM   #13354
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Originally Posted by crimson eagle

Thats ok, I know you guys need to have THREE of you running to have a chance of beating me. We shall see what you and the other two wise asses can bring to the table this week.


The only water at the track will be from your bitter sweet tears, bitter from the wise ass whooping I will bestow upon you and sweet from your admiration of the impeccable racing line I will be following.


(insert dirisive taunt her


It would of been great to have you there, I was actually pitted on the bench and saving you a spot. It's all good though, we will be here when you are ready to visit again, take it easy dude.

Oh... you do not want to start with me. After the last couple of races I'm as cranky as an old wounded bear! So cranky that I had to go out and spend $500 bucks this week on new equipment. So don't be draging those sticks up and down the bars on this bears cage. You might draw back a bloody stump!
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Old 06-17-2005, 11:13 AM   #13355
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Does anyone know if any shops sell the yokomo parts for the L4? yokomo does, but I figured that they would be less expensive if I bought them not from yokomo.

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Old 06-17-2005, 11:20 AM   #13356
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Default IRS Pods and top deck


I received my IRS pod plates today. Top deck lowered for better clearance on todays super slammed bodies. Axle dropped 0.090" to run smaller tires and of course 4-screw top deck for much needed rigidity in the rear pod. Sorry for the crappy pic-but I am in a hurry

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Old 06-17-2005, 11:43 AM   #13357
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That sure looks sweet!
Thijs van M[HPI/HB]
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Old 06-18-2005, 03:02 PM   #13358
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THe 19 turn we will be running, are we using locked endbell?
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Old 06-18-2005, 03:55 PM   #13359
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Anybody know who carries thicker fiberglass t-bars then the AE 0.075?
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Old 06-18-2005, 04:27 PM   #13360
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lino- i think powerpush sells thicker t-plates, 80 possibly???
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Old 06-18-2005, 05:48 PM   #13361
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Please forgive my ignorance but where can you get the purple anodized parts for the L4 / Hara Hammer?


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Old 06-18-2005, 09:01 PM   #13362
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Default kawada front end


Any clue if kawada front end will fit RC12L3/L4 type of chassis ?
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Old 06-18-2005, 10:16 PM   #13363
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What is the difference in bump steer between a stock mounted servo, and a glued down servo? Also, does anyone play with front/back servo movement maybe for different ackerman?
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Old 06-18-2005, 10:22 PM   #13364
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i have my servo as far foward as possible.. I find it allows me to keep on the throtle till the last minute, giving me more cornor speed.... ackerman good
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Old 06-18-2005, 10:32 PM   #13365
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Originally Posted by Randy Caster
What is the difference in bump steer between a stock mounted servo, and a glued down servo? Also, does anyone play with front/back servo movement maybe for different ackerman?
If you mount the servo flat then you need to space up the steering block ballstuds or you get major bumpsteer
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