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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.

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

TIRES:
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!

THIS MAY NEED UPDATING FOR THE NEW BLACK CRC CARPET

Brands:
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:
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:
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.

Examples:
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:
BSR/CRC/Jaco



Contact



Corally



JFT (Japan Foam Tire)



Ulti



Enneti (Xceed)



ELECTRONICS:
ESC:
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 decide to use an Rx pack, MAKE SURE TO REMOVE THE RED WIRE FROM THE ESC PLUG THAT GOES INTO THE RECEIVER!!!

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.

1S ESC:
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!
Servos:
BODIES:
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


PROTOForm:

Reflex Racing/RSD:

SUSPENSION ADJUSTMENTS:

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Old 11-05-2007, 08:26 AM   #27301
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Hey guys, I just got back into 12's recently and had some questions. Does anybody remember what the magic rollout numbers were for running gp3300's and a green machine type stock motor. I raced today using a 31/98 64.5mm tire and dumped twice. Cells are brand new but have been sitting for a while.

Also I got in to a whole bunch of brand new unnassebled reedy real time 3300 matched packs. I think they have been sitting for a cuople of years. They all false peaked every 200milliamps 5-6 times and then took a full charge fine. Is this normal for 3300s?
Your batteries are probably shot. They dont like to sit around, they'll self discharge and sit with zero charge in them, which usually results in a loss of capacity. Thats probably why your new unasssembled cells are false peaking too.
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Old 11-05-2007, 08:41 AM   #27302
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Originally Posted by TRX-1 View Post
Hey guys, I just got back into 12's recently and had some questions. Does anybody remember what the magic rollout numbers were for running gp3300's and a green machine type stock motor. I raced today using a 31/98 64.5mm tire and dumped twice. Cells are brand new but have been sitting for a while.

Also I got in to a whole bunch of brand new unnassebled reedy real time 3300 matched packs. I think they have been sitting for a cuople of years. They all false peaked every 200milliamps 5-6 times and then took a full charge fine. Is this normal for 3300s?
I'd also say you are rolled-out WAY big for brushed stock if 64.5mm is your tire size and not a typo. Did you mean 46.5? With the info you've given you're at 64mm roll-out which is headed into brushless territory and even then only with 4200's. On our club track (40 X 65 with 8-10' lanes) I roll my Stocks out in the 45-50mm range depending on layout. I'm not particularly aggressive on roll-out but 64mm on 3300 cells is WAY too high for any layout I've ever seen.

Double-check your tire diameter--TC tires are in the mid-high 50's. 1/12 tires are generally in the mid-high 40's. I don't think I've even seen DONUTS that were 64mm.
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Old 11-05-2007, 03:22 PM   #27303
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Questions?? 1/12 CRC Generation X Carpet Knife

Hi, i am new to 1/12 and also new to RCTECH, I just ordered a CRC Generation X Carpet Knife to run at my local track in Toledo, Ohio. The kit is the only thing that I have ordered so I am still looking to get everything else. Im thinking that the stock class would be the best for me. I race mostly 1/8 nitro offroad (Losi 8B and 8T), however last year ran some 1/18 onroad at a foam track The Current track is a carpet track (thank god) I have a recoil with a Cefx chassis brushless and lipo power. Just saw 1/12 run and I had to have one! The recoil is fun but that class just isnt there. So back to the point I could use some info on what to run with my new Carpet Knife, Motor ( brushed or brushless) or maybe people dont run brushless in stock class ( I dont know) ESC, Tires, ride height, Servo and any other general 1/12 knowledge would be great. Thanks for the help cant wait for the car to get here
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Old 11-05-2007, 07:03 PM   #27304
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Where can I get 1/4x3/8 flanged bearings cheap (bulk). Avid is out of stock
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Old 11-05-2007, 07:19 PM   #27305
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Where can I get 1/4x3/8 flanged bearings cheap (bulk). Avid is out of stock
boca bearings.
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Old 11-05-2007, 07:48 PM   #27306
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Where can I get 1/4x3/8 flanged bearings cheap (bulk). Avid is out of stock
It is rough to find them cheap without having a dealer account with a bearing company. They will require you to buy alot of bearings. I dont really know what you mean by bulk but if you let me know i can give you the best deal i can on them.
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Old 11-05-2007, 07:55 PM   #27307
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I could use some info on what to run with my new Carpet Knife, Motor ( brushed or brushless) or maybe people dont run brushless in stock class ( I dont know) ESC, Tires, ride height, Servo and any other general 1/12 knowledge would be great.
Well, that's a rather broad question. For setup recommendations, go to www.teamcrc.com. There are various setups posted for the GenX that will give you a very good place to start regarding tires, ride height, springs, dampening, tires, gearing, etc. Any of the quality mini servos will work well, JR 3550 or 3650, Futaba 9602 and others. Check with your local track to see if they allow brushless motors in the stock class. If so, get the most popular motor/ESC setup run by the local racers. If not, the Novak GTX has been a very good ESC for brushed motors, as well as others such as Tekin, LRP, etc. The Trinity CO 27 is a good brushed stock motor, but again I would check with the local racers to see what is popular in your area. It is much easier to enjoy this hobby if others at your local track are running the same products so you can learn from their experience.

Good luck!
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Old 11-05-2007, 07:56 PM   #27308
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Originally Posted by mnracer View Post
Where can I get 1/4x3/8 flanged bearings cheap (bulk). Avid is out of stock
run ceramics they last forever in 1/12
and diff balls too
my balls are 3 years old. my bearings are 2
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Old 11-05-2007, 07:58 PM   #27309
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Ceramic bearings are good but are not bulletproof. They all have races and they cant handle a ton of sideload
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Old 11-05-2007, 08:03 PM   #27310
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Ceramic bearings are good but are not bulletproof. They all have races and they cant handle a ton of sideload
only if you really hit big but if you do that your car will be messed anyway.
normal bearings on small hits get all gritty and really suck.
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Old 11-05-2007, 08:04 PM   #27311
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my balls are 3 years old
Wally, I thought you were older than that
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Old 11-05-2007, 08:07 PM   #27312
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a decent side hit will wreck any small race. If you dont hit stuff that hard you will be ok. There are other variables also. You need to keep them clean and also keep them oiled otherwise a ceramic or standard will be garbage. I have run ceramics for about 1 year in one car and i have high quality standard bearing in my other car for the same amount of time. Both are still in good shape.
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Old 11-05-2007, 11:23 PM   #27313
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What is better for carpet runnig your servo flat or angled?Also is 16 gauge wire enough to run for 13.5 brushless?
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Old 11-05-2007, 11:26 PM   #27314
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What is better for carpet runnig your servo flat or angled?Also is 16 gauge wire enough to run for 13.5 brushless?
I run mine angled but this is all preference. 16 gauge is ideal for 1/12 as it doesn't cause tweak issues. I run 16 gauge with an 8 turn motor with no issues so it will be fine with your 13.5
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Old 11-05-2007, 11:38 PM   #27315
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Uh oh, AY stepping up to 1/12th scale. I dont think norcal is ready for that.
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