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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 03-20-2009, 02:58 PM   #31051
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I would agree with everything Trips gave you Hyper if that's worth anything. I've been wheeling around the R5 for a few weeks now. If you built it with the stock setup I could see where you would be looking for more steering. I've about got mine where I want it.
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Old 03-20-2009, 03:13 PM   #31052
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Originally Posted by Hyper_Mike View Post
Sorry guys...one more (dumb) question for Trips or anyone else!

When would you choose to go to a softer front tire or harder rear tire to gain more turning versus making changes to springs/shock position/etc?

For example I could change from Lilac front tires to Dbl Pink front tires OR I could change to the stiffer shock spring to get more turning. When would you choose to do one over the other? Is there any difference?

Sorry to be a pain!

Cheers,
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Wow, that's a good question and I'm afraid I don't really have a good answer... I'm gonna sit back and see what people have to say on this subject... this could be interesting.
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Old 03-20-2009, 03:40 PM   #31053
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Well I'm no top racer or tuner so if I'm wrong someone please correct me...

The way I look at tire vs spring is that tires are usually a more radical change and springs/shock position is more fine tuning. If I need a large change in handling I look to tires but if I'm close I look at setup. Also I try to take in account what other people are running and if I am running those tires already I would be more inclined to think it was my setup.
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Old 03-20-2009, 04:52 PM   #31054
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Originally Posted by InspGadgt View Post
Well I'm no top racer or tuner so if I'm wrong someone please correct me...

The way I look at tire vs spring is that tires are usually a more radical change and springs/shock position is more fine tuning. If I need a large change in handling I look to tires but if I'm close I look at setup. Also I try to take in account what other people are running and if I am running those tires already I would be more inclined to think it was my setup.
I do tend to be something of a follower when it comes to tires... if I'm on the same tires as the guys on top of the results, I tend to look at chassis... if I'm on different tires and a bunch of people are going faster than me, I'll try the tires the majority of them are using...

Not the most scientific method.
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Old 03-20-2009, 05:23 PM   #31055
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That's how I've been choosing tires thus far too!

That's how I came to try the Grey rears and Lilac fronts as the fastest guy in our club runs that combination on his DB12R. As I said before though my car was just too squirrelly coming out of corners with the Grey on the back so clearly there are some differences in either the cars or the driving style or both

I guess what it comes down to is trying different things and letting the lap times be the final arbiter of what works!

I appreciate the opinions and discussion...thanks!

Cheers,
Mike

Quote:
Originally Posted by Trips View Post
I do tend to be something of a follower when it comes to tires... if I'm on the same tires as the guys on top of the results, I tend to look at chassis... if I'm on different tires and a bunch of people are going faster than me, I'll try the tires the majority of them are using...

Not the most scientific method.
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Old 03-20-2009, 06:18 PM   #31056
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Generally if you pick tires that most the top drivers in your area are using you will be in the ball park. As you noticed though due to differences in driving style you may alter that tire combo but it is likely to not alter much.

This brings to mind another question that has been on my mind ever since the Snowbirds...Typically in full sized racing teams will run the hardest tire they can get away with and still maintain a competitive amount of traction. So as grip goes up tires get harder. The reason explained to me was to reduce friction which makes the car faster. Now racing pan car on asphault this seems to hold true as when our grip comes up we tend toward harder tires. But why is it in carpet racing we run so much softer of a tire? So soft in fact that the tires have to be trued very small to keep the cars from traction rolling.
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Old 03-20-2009, 06:25 PM   #31057
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Quote:
Originally Posted by InspGadgt View Post
Generally if you pick tires that most the top drivers in your area are using you will be in the ball park. As you noticed though due to differences in driving style you may alter that tire combo but it is likely to not alter much.

This brings to mind another question that has been on my mind ever since the Snowbirds...Typically in full sized racing teams will run the hardest tire they can get away with and still maintain a competitive amount of traction. So as grip goes up tires get harder. The reason explained to me was to reduce friction which makes the car faster. Now racing pan car on asphault this seems to hold true as when our grip comes up we tend toward harder tires. But why is it in carpet racing we run so much softer of a tire? So soft in fact that the tires have to be trued very small to keep the cars from traction rolling.
we still run the hardest tire we can and still maintain the tracktion that we need to make it around the track. carpet racing is usually on smaller tracks and tighter lanes. so we need more traction.
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Old 03-20-2009, 06:31 PM   #31058
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Quote:
Originally Posted by Trips View Post
Wow, that's a good question and I'm afraid I don't really have a good answer... I'm gonna sit back and see what people have to say on this subject... this could be interesting.
i have a base setup that I like to use on a new layout or when I am visiting a new track. I use to start with a purple and gray tire, but lately the lilac and yellow has been my favorite combo. If I need a lot more steering I try a softer front or a harder rear tire. If I need just a little I start to look at chassis setup. Now if I have way too much steering I would look at a harder front or a softer rear. but as stated run the harderst combo you can that give you the steering that you want.
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Old 03-20-2009, 06:53 PM   #31059
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we still run the hardest tire we can and still maintain the tracktion that we need to make it around the track. carpet racing is usually on smaller tracks and tighter lanes. so we need more traction.
The Birds track I believe was somewhere around 100' by 40' which is pretty close to what we run on our asphault track at 60' by 60'. We run dbl pinks all around where the setup at the birds was typically lilac/yellow. Well hopefully someday I'll live near a carpet track where I can test alternatives just to see what happens
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Old 03-20-2009, 06:58 PM   #31060
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Originally Posted by InspGadgt View Post
The Birds track I believe was somewhere around 100' by 40' which is pretty close to what we run on our asphault track at 60' by 60'. We run dbl pinks all around where the setup at the birds was typically lilac/yellow. Well hopefully someday I'll live near a carpet track where I can test alternatives just to see what happens

Dpl pink on carpet is not a pretty sight, I've tried it. I have no idea what it is about carpet vs asphalt that causes this difference from a science aspect, would be an interesting study tho.

Edited to add: I would guess that with enough time someone could find a setup that would work for dpl pink on carpet; just need a ton of time and practice to test lots of different setups.
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Old 03-20-2009, 07:43 PM   #31061
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the super stock and mod guys are running double pink on carpet at the nats. and lilac is harder the double pink

is p2 running double pinks all the way around? the couple times I ran with him was a couple years ago when we were still running brushed for stock. he was running purple/grays which is what we run on carpet with brushed. And I know that he was running double pinks with a 7.5 brushless.

I really feel that on asphault guys setup for the rear and find a front tire that works. while on carpet we usually look for a setup for the front tires and looks for a rear that works with it.
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Last edited by theisgroup; 03-20-2009 at 07:53 PM.
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Old 03-20-2009, 09:22 PM   #31062
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Originally Posted by theisgroup View Post
the super stock and mod guys are running double pink on carpet at the nats. and lilac is harder the double pink

is p2 running double pinks all the way around? the couple times I ran with him was a couple years ago when we were still running brushed for stock. he was running purple/grays which is what we run on carpet with brushed. And I know that he was running double pinks with a 7.5 brushless.

I really feel that on asphault guys setup for the rear and find a front tire that works. while on carpet we usually look for a setup for the front tires and looks for a rear that works with it.
Yang,
The 2 times that I raced at TX state champs @ Mikes I ran Purple/Grey then Magenta/Magenta. I think this was due to the change in the brand of carpet used. CRC for the Magenta/Magenta...With the new breed of tires, I'd probably run Lilac/Yellow.

At Hobby Town SA I always ran Pink/double pink, except in 2005 we all ran pink/purple with .018 front springs. Now we all use .020s hence the softer DP front tire.

Here in Hawaii, I've run Pink/double pink and 2 stage DP all around with good results. I tried DP rears and Magenta rears but my car was loose (traction was low too ). Some guys (BMI) are here are using DP all around and their cars handle good. I think that some cars are better suited for different tires types. I know that when I had my R5, I was always looking for more steering....so you could probably get away with a harder rear tire.
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Old 03-20-2009, 10:09 PM   #31063
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I really feel that on asphault guys setup for the rear and find a front tire that works. while on carpet we usually look for a setup for the front tires and looks for a rear that works with it.
That is an interesting observation...might be on to something there.
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Old 03-20-2009, 10:11 PM   #31064
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Yang,
The 2 times that I raced at TX state champs @ Mikes I ran Purple/Grey then Magenta/Magenta. I think this was due to the change in the brand of carpet used. CRC for the Magenta/Magenta...With the new breed of tires, I'd probably run Lilac/Yellow.

At Hobby Town SA I always ran Pink/double pink, except in 2005 we all ran pink/purple with .018 front springs. Now we all use .020s hence the softer DP front tire.

Here in Hawaii, I've run Pink/double pink and 2 stage DP all around with good results. I tried DP rears and Magenta rears but my car was loose (traction was low too ). Some guys (BMI) are here are using DP all around and their cars handle good. I think that some cars are better suited for different tires types. I know that when I had my R5, I was always looking for more steering....so you could probably get away with a harder rear tire.
Even with pink rears that is still more firm then the yellows being used in carpet.
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Old 03-21-2009, 12:35 AM   #31065
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Even with pink rears that is still more firm then the yellows being used in carpet.
actually if you look at it pink is the same shore rating as yellow. but pinks build tracktion and yellows actually do not. so the yellows are more like a gray
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