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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 10-07-2003, 09:20 PM   #4321
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Now if you look at this picture the servo is the way I heard.....

But if you look at the picture from speed merchant on that new front end ( but simular a-arm construction )the servo is like stock....


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Old 10-07-2003, 09:35 PM   #4322
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I have my servo setup like the picture with the old skool front end and have had no problems with it that way.
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Old 10-07-2003, 09:39 PM   #4323
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I just shoe goo'd my servo down flat on the chassis. That way there's a lower center of gravity and you don't have the extra weight of the servo mounts. But if you remove your servo often than don't shoe goo it down. I'm guessing it will be a big pain to remove. So I'm not really looking forward to the time when I do have to remove it. The main reason I shoe goo'd it down was because my servo saver would hit my Ascari body, that thing is just so slammed.
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Old 10-07-2003, 09:42 PM   #4324
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speedxl- The class I run is primarily stock, obviously 4cell.
My Quad 12 setup (Track is approx 80' x 35')
front end reactive caster
springs-.022 will change to .020 b4 next race
caster- 5deg.neg
camber-1.5 neg
tires-bsr purple front and bsr pink rears
ride height-3mm front and rear will raise b4 next race

shock-50wt. blue spring
dampner-purple stuff (trinity)
tee plate-Blue MoJo will change to thicker one for next race
axle-IRS large ring
spur-94t pse
pinion- 31 tooth
R/O-approx 1.75
body-Protoform Bently will change to Parma speed 8 until I paint my Ascari
as I said it was glued compared to my last car just needs a little fine tuning as does my driving I'll probably try the changes this sunday and let you know
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Old 10-07-2003, 09:43 PM   #4325
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glue servo on chassis may have bump steer
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Old 10-07-2003, 10:26 PM   #4326
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xracer i use .20 springs up front and silver in the center with 40wt oil. on asphalt and carpet .
asphalt .063 tplate and pink rears
carpet .074 " " " and grey rears
and parma speed 8 on both sufaces . in 19t and 27t.
as far as the ascari has to much down force and designed more modified
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Old 10-07-2003, 11:01 PM   #4327
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Default tire size

what is ideal for a good difference between front to rear tire diameter ......
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Old 10-07-2003, 11:07 PM   #4328
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about .10 smaller in the front 1.80 and 1.90 for aspalt
and 1.75 front and 1.85 carpet
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Old 10-08-2003, 05:45 AM   #4329
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On the topic of servo mounting...

dont go by that picture, since its just for the v-force, which is different than other front ends out there. If you want to see how to mount the servo for a new style front end check out AE's site, and for the old style front end (well it was already posted on this forum recently).

Old style front end: servo flat
New and v-force: angled
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Old 10-08-2003, 05:04 PM   #4330
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Does anyone have a preference of Jaco, TRC, or Calendra foam tires? I know CRC foams are just Jaco foam on CRC rims. But I was wondering which ones people like the most. Also if you have any reasons why I would like to know those too (not just CRC's because they look cooler and stuff like that). Thanks for any help.
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Old 10-08-2003, 05:15 PM   #4331
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Quote:
Originally posted by racerdx6
Does anyone have a preference of Jaco, TRC, or Calendra foam tires? I know CRC foams are just Jaco foam on CRC rims. But I was wondering which ones people like the most. Also if you have any reasons why I would like to know those too (not just CRC's because they look cooler and stuff like that). Thanks for any help.
I prefer the TRC over the CRC and the Jaco stuff.
My reasons are as follows:
1. The quality control on the TRC's seems to be tighter over the Jaco,CRC tires and rims. As of late, alot of the racers here have noticed a substantial wobble and inconsistency in the mounting of the foam to the rim coming from the CRC/JACO camps. This has yet to be seen on TRC's. Again, this is only going by what I and our local racers here have experienced. I'm sure others will have a difference of opinion.
2. The compound of the TRC's are more consistent from package to package. I use a durometer on all of my tires when they break out of the package. I never just purchase one set of tires, I usualy purchase in bulk quantities, enough to last me the racing season. This way I can match the tires better for a more consistent feel.
3. Out of the package, the TRC's spin truer.
4. More selection of compounds.

Just my $.02
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Old 10-08-2003, 05:33 PM   #4332
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The CRC rims are very durable, however they weigh alot. Jaco had a problem during last season with glue coming apart in the center bead of the tire, however all of the new white rims seem to be much better and all of the problems are gone.
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Old 10-08-2003, 06:25 PM   #4333
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I found Jacos to develop play around the inner bearing after 3-5 runs. With TRC tires, I now no longer have this problem. I also prefer the wider width, and the consistency of compounds. Its enough that Im able to bring myself to buy something from trinity.
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Old 10-08-2003, 06:35 PM   #4334
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Yeah, I understand that it can be hard to bring yourself to buy something from trinity. Its pretty difficult for me too. So that was why I was asking if the trinity tires were any good because I was just kinda interested in getting some because they look cool. And they will also look even cooler with the little yellow accents I'll have on my new body. I'm such a sucker for colors . Thanks for all your help .
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Old 10-08-2003, 06:36 PM   #4335
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Quote:
Originally posted by stormperson
The CRC rims are very durable, however they weigh alot. Jaco had a problem during last season with glue coming apart in the center bead of the tire, however all of the new white rims seem to be much better and all of the problems are gone.
funny you say that. i can only run jacos on my full size (10L3) because TRC tires rub on the pod,anyway i ordered a bunch from Tower Hobbies and sure enough the first set split down the middle. it looks like two tires on one rim- didnt affect handling any-it just looks funny. the other thing was some of the rear wheels have recessed bolt holes and others dont. that screwed me up, i had all my bolts trimmed so they just made depth in the hubs. must have been some old ones layin around the warehouse-probably not the best place to order foams. its gonna be TRC for 12L3
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