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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 10-04-2006, 11:02 AM   #21016
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CRC front end

I also forgot to mention that it has a way of building it to its like the old skool front end (no reactive caster or adjustable upper arm). I forget how-but Frank told me about that feature at vegas.
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Old 10-04-2006, 11:06 AM   #21017
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JON hopefully i can help you here most of the stock racers and mod racers(dumas,mcmahone,dayger,prichard)have all gone back to spring cars for mod so their is really only two choices rev4.5 or crc knife as for reciever packs alot of people dont run them anymore due to the new cells having so much run time you really dont get into the lower voltage of a pack to make the servo got a littel nuts on you and as for bodies it still looks like the parma speed 8 is the stock body while the protoform speed12 is the mod choice ..


ray that front end is pretty bad a$$ hopefully it will be on my car before the holloween race
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Old 10-04-2006, 11:06 AM   #21018
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the BMI allows you to run a damper disc or damper tube setup. You get 2 upper pod plates (one for each). just make sure to understand that all the holes for the tube mounts are drilled to be tapped 4-40. i didn't know there were tubes designed to accommodate 4-40 cups. so jason is taking care of me and some 2-56 holes. the other nice thing about it is the cut on the bottom side of the chassis that recesses enough for tape so it isn't exposed as much (nor are the batteries).

great service.
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Old 10-04-2006, 11:09 AM   #21019
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Quote:
Originally Posted by rayhuang
CRC is about to revolutionize 12th scale building when it releases its new front end. if you search through rc.50.com youll find pics. No more black magic (my specialty-ho hum) to get a perfect front end everytime.

some highlights include super fast and easy camber adjust with pillow ball, fast caster adjustments and no more shims on the kingpins. YOu adjust spring tension (preload or no preload) with a hex driver. Very hard to build it wrong (ie. binding). Ride height adjustment will be enough to run a rim with felt on it to a full size uncut tire. Steering arm (spindle) is now outside of the rim.

Also-with the flip of a part-you can go from unheard of caster to the caster we run now as well as choosing between 0,5 and 10 deg mounts.
Looks and sounds sweet!
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Old 10-04-2006, 11:14 AM   #21020
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Quote:
Originally Posted by smyka
ray that front end is pretty bad a$$ hopefully it will be on my car before the holloween race
Sure-rub it in!! Man i felt bad for Carissa at Vegas-her 12th was SO FAST-like A-main fast!! I calculated (like it was hard) I ran 24 minutes and only lightly tapped three boards at Vegas (3rd, 4th qual and main) but my motor or something was so slow I couldnt even make it out of the D!!!

btw-I am ordering another 3.2-I got to get fast with one too. I love my T-fource mind you!!
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Old 10-04-2006, 11:19 AM   #21021
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Thanks Mark and timmay70. I really don't like the idea of a T-plate car so the Rev4.5 I think is the way for me. I'm not sure if I'll be running mod or stock. The track we have right now is pretty small but I think a lot of the guys who are planning to run 1/12 will be doing mod. I'll get a Rx pack just in case. I don't want to take the chance. Running the micro Spektrum Rx should leave plenty of room and keep things balanced with a pack in there. I know with TC's on foam, tire choice is pretty simple, (dbl pink/dbl pink orange if you're using Jaco) is it pretty much the same with 1/12th?
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Old 10-04-2006, 11:23 AM   #21022
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Quote:
Originally Posted by rayhuang
I love my T-fource mind you!!
I'm sure it loves you too, jusy as long as you don't LOVE your T-Fource, you know Seaball style....
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Old 10-04-2006, 11:29 AM   #21023
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Quote:
Originally Posted by rayhuang
CRC is about to revolutionize 12th scale building when it releases its new front end. if you search through rc.50.com youll find pics.
For those who can't find it, here is a good pic of it http://www.rc50.com/modules.php?name...093&fullsize=1
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Old 10-04-2006, 11:34 AM   #21024
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That front end does look pretty trick. When is that supposed to be available to the public?
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Old 10-04-2006, 11:37 AM   #21025
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Quote:
Originally Posted by Jon Kerr
I know with TC's on foam, tire choice is pretty simple, (dbl pink/dbl pink orange if you're using Jaco) is it pretty much the same with 1/12th?
Jon-it depends a bit on which car and brand of tires you choose. If jaco-youve got all the standard tires and then the wraps. I havent run jacos in ages-so someone else will have to fill you in.

If your running Parma then its Purple front Grey rear 90% of the time for stock. In mod its Magenta front and Pink rears 90% of the time.

Now-not to toss a wrench in things, but link cars sometimes like Parma black or purple fronts and White or Grey rears. Ive always thought tire comobination in link cars is more critical than on a t-bar car-like it can make a link car go from "well its not bad" to "holy-crap its dialed".

And I also like Parma Violets on the front in 19t. Its quite a bit more steering than purple, but wont make car edgy like a Magenta will. Sometimes Violets work in stock too, but rarely.

Now lastly there are CRC High Rollers. Its CRC answer to wraps. A large diameter rim. Seem to work very well on there 3.2r, but again-I never tried them.
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Old 10-04-2006, 11:53 AM   #21026
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Quote:
Originally Posted by GrandeGixxer
Howard, I got some tires for you to try out. I will even put a fresh cut on them for you.
Nice....tires are the only thing I am short...I have couple set of Jaco/Parma but they are unknown shores....look like they are for outdoor asphault use compound....

Only if I can make it SAT....will see. But thanks anyway....did you get my PT?
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Old 10-04-2006, 12:01 PM   #21027
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Quote:
Originally Posted by rayhuang
CRC is about to revolutionize 12th scale building when it releases its new front end. if you search through rc.50.com youll find pics. No more black magic (my specialty-ho hum) to get a perfect front end everytime.

some highlights include super fast and easy camber adjust with pillow ball, fast caster adjustments and no more shims on the kingpins. YOu adjust spring tension (preload or no preload) with a hex driver. Very hard to build it wrong (ie. binding). Ride height adjustment will be enough to run a rim with felt on it to a full size uncut tire. Steering arm (spindle) is now outside of the rim.

Also-with the flip of a part-you can go from unheard of caster to the caster we run now as well as choosing between 0,5 and 10 deg mounts.
is the axle bearings in the hub instead of the wheel?
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Old 10-04-2006, 12:01 PM   #21028
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Quote:
Originally Posted by Jon Kerr
That front end does look pretty trick. When is that supposed to be available to the public?
DITTO!!
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Old 10-04-2006, 12:04 PM   #21029
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What are the shore ratings of the different compounds? Is there a list somewhere?
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Old 10-04-2006, 12:10 PM   #21030
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Sorry, guys...I'm new to 12th scale racing. What are wraps?
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