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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 12-29-2012, 02:31 PM   #38911
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Quote:
Originally Posted by Pulse_ View Post
It seems CRC and Associated are the most used cars so there are good chances I'll go for one of them.

As you know I'm looking for a complete used chassis and here is a proposition I got in pm:

- 12r5.1 + few parts + painted body + unpainted body
- s9650 servo
- 14 sets of jaco tires for carpet (purple, pink, double pink..)
- lrp sphere competition ESC
- quite old lipo but still working VTEC 4200mah
- 10 sets of P64 pinion

What do you think? Would this be a good basis? Is tere anything in the list that you wouldn't keep for a reason? For the motor I plan to use my X11 10.5. Thanks again for your help
Three things standout on that list that I personaly would upgrade. 1st the lipo, not really enough mah for 10.5 it may be a low C rating version, and as its "quite old" it needs to be replaced anyway. 2nd is the esc, that one will work to get you going but I'd want a more up to date esc myself. 3rd is the tires, I have not run 10.5 in ages as its not a class we run around here but I would expect that you would need a different compound. Magenta all around depending on the grip levels at your track I'd guess. If the price is right its a solid starting point
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Old 12-29-2012, 02:49 PM   #38912
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Quote:
Originally Posted by Pulse_ View Post
It seems CRC and Associated are the most used cars so there are good chances I'll go for one of them.

As you know I'm looking for a complete used chassis and here is a proposition I got in pm:

- 12r5.1 + few parts + painted body + unpainted body
- s9650 servo
- 14 sets of jaco tires (purple, pink, double pink..) - the track is carpet so I need to make sure about the compound
- lrp sphere competition ESC
- quite old lipo but still working VTEC 4200mah
- 10 sets of P64 pinion

What do you think? Would this be a good basis? Is tere anything in the list that you wouldn't keep for a reason? For the motor I plan to use my X11 10.5. Thanks again for your help
If you go for the Sphere you may need to add a Voltage booster (for example RC Dynamics) to get enough power for the servo and your receiver. If you want LRP ESC go for Stock Spec V2 you can skip the booster with this one.
About lipo you can find good new one for cheap on ebay.

Your tire choice is good for this track carpet. I was using RR Pink and FR x2 pink
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Old 12-29-2012, 04:00 PM   #38913
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Asking price is 290$ (220€) for everything I mentioned above. Do you find this a correct pricing?

It sounds like I would have to replace the lipo in any case so rather buy something new. The chassis, tires, and servo would be a good option though and I have a motor already. Concerning the ESC, the seller told me there is no problem. On the pic it looks like he is running a booster already but I might be wrong:



How is the quality of asso parts compared to crc?

My goal is to have a good starting basis that I'll be able to keep without doing major improvements. I really want to focus on learning and driving rather than buying/ selling etc.. Thanks again for your help guys, I know a few things about offroad but onroad is all new to me
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Last edited by Pulse_; 12-29-2012 at 04:13 PM.
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Old 12-29-2012, 04:17 PM   #38914
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What you see behind the servo is not a booster...it is a capacitor for the ESC. LRP uses large capacitors.
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Old 12-29-2012, 04:37 PM   #38915
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ok I'm laughing at myself now , thanks
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Old 12-30-2012, 03:17 AM   #38916
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What good priced ESC would you recommend for 1/12 that is also 2S capable?
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Old 12-30-2012, 03:28 AM   #38917
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Quote:
Originally Posted by Pulse_ View Post
What good priced ESC would you recommend for 1/12 that is also 2S capable?
Viper Vtx1 is a great option.
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Old 12-30-2012, 07:15 AM   #38918
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Quote:
Originally Posted by No9 View Post
Viper Vtx1 is a great option.
thanks, is a 120A Xerun ok too?
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Old 12-30-2012, 07:58 AM   #38919
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Quote:
Originally Posted by Pulse_ View Post
thanks, is a 120A Xerun ok too?
The Hobbywing Xerun 120a 1s would meet your need the best. The Viper VTX 1, LRP Super Stock V2 and Orion 1s all all great too, have boosters and work with 2s, but sell for $80-$100 more than the Hobbywing.

That said it I had an extra $90 lying around I would get the Viper VTX 1.
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Old 12-30-2012, 09:05 AM   #38920
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Anyone have any feedback on the Thunder Power brushless motor for 17.5. Seems like the Trinity or Revtech are dominant.
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Old 12-30-2012, 12:45 PM   #38921
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I think if you are running a Trinity D3.5, Reedy Sonic or a Thunder Power you are good to go power wise.
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Old 12-30-2012, 01:44 PM   #38922
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Quote:
Originally Posted by AdrianM View Post
The Hobbywing Xerun 120a 1s would meet your need the best. The Viper VTX 1, LRP Super Stock V2 and Orion 1s all all great too, have boosters and work with 2s, but sell for $80-$100 more than the Hobbywing.

That said it I had an extra $90 lying around I would get the Viper VTX 1.
I just won an auction for a 1S hobbywing ESC in new condition so this will be the one

And it even runs 2S, which is always a good thing.

How would you compare your H5020G compared to other servos. I talked about it on french forums and they keep being sceptics about the quality

Thanks for your feedback.
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Old 12-30-2012, 03:34 PM   #38923
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I think that it is made by Savox??? Other Spektrum servos are. I have one on the way, should be here this week.

Others can chime in, I would like to know as well.
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Old 12-30-2012, 06:32 PM   #38924
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Quote:
Originally Posted by Pulse_ View Post
I just won an auction for a 1S hobbywing ESC in new condition so this will be the one

And it even runs 2S, which is always a good thing.

How would you compare your H5020G compared to other servos. I talked about it on french forums and they keep being sceptics about the quality

Thanks for your feedback.
I am one of the guys that have been really promoting the H5020G as the next great pan car servo. I have had one running perfectly in my WGT for a couple months now. I just got a 2nd one for my new RC12R5.2.

The H5020G was intended to be a Heli tail rotor gyro servo. Tail servos have to be blazing fast, center perfectly and be able to handle the heat generated by processing hundreds of digital inputs per second from the gyro. No other r/c application is as critical or hard on a servo than the life of a tail servo. If this fails a $1200 550 class heli turns into scrap.

I think this servo will outlast your car.
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Old 12-31-2012, 01:55 AM   #38925
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Quite convincing

Looking at its price it's worth trying it too
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