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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 07-14-2014, 06:06 PM   #40936
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I went to purchase some spurs for the first time in a long time and found that PRS (Precision Racing Systems) does not seem to making the small size spurs anymore. Anyone know why/when they stopped?
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Old 07-14-2014, 11:50 PM   #40937
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Default 1/12th rim offsets

This request goes out to all 1/12 scale racers. I am looking to find out the different offsets in the rims. Are Jaco the same as Yokomo, CRC, BSR, Ulti, Tamiya, and or Parma? What rim offset and or manufacturer is considered the standard for 1/12th scale cars? So if you know please let me know. I have heard that Tamiya and Yokomo cars can't run some manufacturers tires due to the offsets. Again I am just curious what the offsets are for each manufacturer front and rears if you know. Any and all help is greatly appreciated.

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Old 07-15-2014, 05:43 AM   #40938
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Quote:
Originally Posted by Root_66 View Post
This request goes out to all 1/12 scale racers. I am looking to find out the different offsets in the rims. Are Jaco the same as Yokomo, CRC, BSR, Ulti, Tamiya, and or Parma? What rim offset and or manufacturer is considered the standard for 1/12th scale cars? So if you know please let me know. I have heard that Tamiya and Yokomo cars can't run some manufacturers tires due to the offsets. Again I am just curious what the offsets are for each manufacturer front and rears if you know. Any and all help is greatly appreciated.

Erik
I would say there is no "Standard wheel off-set" these days
The Jaco / Ulti wheels, and others do offer a decent amount of off-set to fit most cars, giving room to run something less than full rear width as an option

Here is a wheel spec chart from the good folks at kimihiko-yano
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Old 07-15-2014, 10:38 AM   #40939
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Originally Posted by RedBullFiXX View Post
I would say there is no "Standard wheel off-set" these days
The Jaco / Ulti wheels, and others do offer a decent amount of off-set to fit most cars, giving room to run something less than full rear width as an option

Here is a wheel spec chart from the good folks at kimihiko-yano
Thanks for the info. I think this is exactly what I am looking for. Now I just need to brush up on my Japanese reading. I totally missed that day in school.
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Old 07-15-2014, 10:39 AM   #40940
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Thanks for the info. I think this is exactly what I am looking for. Now I just need to brush up on my Japanese reading. I totally missed that day in school.
Google Chrome will help with that some

Here is the kimihiko-yano page in translated "English" format
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Last edited by RedBullFiXX; 07-15-2014 at 05:49 PM. Reason: translation
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Old 07-15-2014, 10:56 AM   #40941
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Originally Posted by RedBullFiXX View Post
Here is a wheel spec chart from the good folks at kimihiko-yano
Thanks for the link. Cool site! I love Japanese RC Blogs.

Not sure if its been posted but here's some great photos from the Japanese nationals...
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Old 07-15-2014, 10:59 AM   #40942
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Quote:
Originally Posted by chris moore View Post
I went to purchase some spurs for the first time in a long time and found that PRS (Precision Racing Systems) does not seem to making the small size spurs anymore. Anyone know why/when they stopped?
I want to say they stopped making them about one year ago or so. I know I couldn't get any at last years IIC in October.

How's that mini body coming?
E
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Old 07-15-2014, 02:05 PM   #40943
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I want to say they stopped making them about one year ago or so. I know I couldn't get any at last years IIC in October.

How's that mini body coming?
E
Wow I guess it's been longer than I thought since I needed any. I'll have it finished by next weekend.
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Old 07-17-2014, 10:52 AM   #40944
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Anyone tried Gravity RC's LGC additive at all, how does it compare with CS High Grip, FXII etc?

Thanks
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Old 07-17-2014, 11:04 AM   #40945
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Works better the SXT 3.0 on the racks i race at. It seems to not fade as bad as SXT on the newer CRC carpet my club put in.
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Old 07-17-2014, 01:51 PM   #40946
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Works better the SXT 3.0 on the racks i race at. It seems to not fade as bad as SXT on the newer CRC carpet my club put in.
How long do you soak for each type of sauce
Fr
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Old 07-17-2014, 02:17 PM   #40947
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For about 30 mins when I first get to the track. I then wipe the fronts off, do a burnout on the burnout carpet and run the first qualie. (Same for both) Wipe Tires with dry rag to clean and then reapply 10-15mins before the next run.
I happened on LGC by accident, I went to Calgary to a race the WCICS Finals and forgot my SXT, and all the local shop there had was LGC. I liked it, no odor at all and the Black fronts and magenta rear combo I run at our home track likes it. I am just got back into 1/12th last season, and my car always got a slight push at like 6:30 min into a race. At the Calgary WCICS final with the LGC I didn't get it. I thought it was just the carpet being different but when I tried it on back at N.A.S.C.A.R. (my club) I never got the push. Our track is newer CRC carpet and we run a big track (5 rolls of carpet), that seems harder on tires that the more worn carpet at Calgary. I like the Gravity tires too. I still occasionally hit the wall though and the front wheel is weaker than the JACOS I have been using.
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Old 07-17-2014, 02:26 PM   #40948
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I have had a similar problem before, my car would lose steering late in the run the fix was going to a harder front tire such as a black, purple, or Ulti X-Hard and saucing more of the tire or for a longer soak. My theory was that the harder compound would wear the sauce off a bit slower and the extra soak would give it similar grip. Hard front tires also seemed to be more consistent over the course of the day, as I typically am lazy and run the same set practice, quals, and race.

Might be worth a shot.
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Old 07-17-2014, 02:41 PM   #40949
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Quote:
Originally Posted by DesertRat View Post
I have had a similar problem before, my car would lose steering late in the run the fix was going to a harder front tire such as a black, purple, or Ulti X-Hard and saucing more of the tire or for a longer soak. My theory was that the harder compound would wear the sauce off a bit slower and the extra soak would give it similar grip. Hard front tires also seemed to be more consistent over the course of the day, as I typically am lazy and run the same set practice, quals, and race.

Might be worth a shot.
I think I would be more inclined to go to a softer tire and either dope less or go smaller in diameter.
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Old 07-17-2014, 02:49 PM   #40950
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At our track the softer tires pick up all of the rubber from the TCs. My club is big with the 5 classes we run we get like a 120-130 entries every friday night. By the time of the second qualie the track has a lot of rubber on it. I tried softer tires and the seem to pick up more track crud than the blacks do. As i said for me and my track LGC seemed to last that extra 1:30 that SXT 3.0 didn't. I never tried soaking the tires with the SXT for longer. I have to wait till the fall to try it.
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