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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 05-21-2009, 09:26 AM   #31456
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RW goes down to 72 in 64p
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Old 05-21-2009, 09:34 AM   #31457
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Originally Posted by Casper View Post
I just ran some numbers on those rollouts. Holly cow those are some big pinons. I was kind of expecting that but wow.
Yep, I was running a 54T Pinion on a 76T Spur with a 45mm tire at the beginning of the day. I have up to 60T Pinion's for smaller tires.
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Old 05-21-2009, 09:44 AM   #31458
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somewhere in these 2000+ pages, I think OD said about the smallest you could go would be a 71/72. any smaller and you would need run the smaller diff rings or i guess they call them the stealth diffs
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Old 05-21-2009, 09:46 AM   #31459
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Yeah I haven't seen anyone making spurs smaller than like 71/72

Quote:
Originally Posted by theisgroup View Post
somewhere in these 2000+ pages, I think OD said about the smallest you could go would be a 71/72. any smaller and you would need run the smaller diff rings or i guess they call them the stealth diffs
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Old 05-21-2009, 09:46 AM   #31460
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Quote:
Originally Posted by 12thScaleCrazy View Post
I thought CRC used this companies wire.
http://www.tqracing.com/sensor.htm
Looking at them you might be right, but I couldn't say for sure myself. (And they do a 125mm one )

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Old 05-21-2009, 10:14 AM   #31461
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Dude-- 72 tooth 64 pitch gear!

I am planning on running 48 pitch just because. I can get a 65 spur which is equivalent to a 86 64 pitch.

IF you guys are doing it though I guess it can be done.

Anyone know how big the CRC "pro cut" tires are stock?

Thanks for answering all my noobie questions guys!
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Old 05-21-2009, 10:25 AM   #31462
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78T 64P is still our best seller for 12th unless Yang-san tells me differently that's what i'll be going with.
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Old 05-21-2009, 10:35 AM   #31463
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Originally Posted by Casper View Post
Dude-- 72 tooth 64 pitch gear!

I am planning on running 48 pitch just because. I can get a 65 spur which is equivalent to a 86 64 pitch.

IF you guys are doing it though I guess it can be done.

Anyone know how big the CRC "pro cut" tires are stock?

Thanks for answering all my noobie questions guys!
We have 58 tooth 48 pitch spur gears and 78 tooth 64 pitch spurs in stock if you need them. Both accept 12 diff balls and both are machined and made from black delrin. 58 tooth is the 48 pitch diameter equivelent to a 78 tooth 64 pitch.
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Old 05-21-2009, 10:41 AM   #31464
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Originally Posted by EricF View Post
I've heard rummors that CH may pull the carpet and go to asphalt or myabe just start running the offroad wet to keeep the dust down. We'll see.
E
That would be too bad, I hope thay wait untill after the SIGP if thay do so. Did you hear any reasons for that? Its sad that the carpet track goes unused so much of the time, I'm wondering if the guys down there would run more if it was asphalt.
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Old 05-21-2009, 11:11 AM   #31465
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Originally Posted by abailey21 View Post
78T 64P is still our best seller for 12th unless Yang-san tells me differently that's what i'll be going with.
i think with a 13.5 you can get in the right range with a 78 spur. I will have to check the roll out and the room in the pod of s SM. but with 17.5 going to 100-105mm roll out. I am not even sure that I can get that with a 76 spur. either way, I seam to like the motor as close to the axle as I can get. have not played much with the spur/pinion combo and ratios with 17.5 awd may have more info on that. I have a couple of 71s and 72s in my bag i need to mount and start looking at 17.5 1s.

the other factor is lazyness. if I mount a small spur, I can always go down in pinion. but if i get a spur/pinion combo that is too big for the pod plates, then I have to build another diff. I hate building diffs. hell this past weekend, dumas offered to build my diff in my 13.5 car because it was soo notchy. he was embarassed that I was running a Speedmerchant. lol
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Old 05-21-2009, 11:17 AM   #31466
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now i got a question.

For the guys running 1s that previously ran 4cell. Have you guys noticed how little drag brake is now in the car with the 1s. I mean you can let off and the car still rolls forever, not like with a 4cell. even push brake barely has any effect on the car. I have not change any of the brake settings in my speedo, but I am going to start playing with that. need to jack up my drag brake and also my brake settings. I know most of the guys i have asked said they used no brake just drag brake with 4cell in stock. we don't run much superstock until 1s came around. but I hear that now the guys are running push brake to get the car to rotate in the corners.
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Old 05-21-2009, 12:23 PM   #31467
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RW goes down to 72 in 64p
I believe the Robinson machined spurs even go down to 68t...at least they used to when I ran a F201.
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Old 05-21-2009, 12:36 PM   #31468
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Originally Posted by Casper View Post
I just ran some numbers on those rollouts. Holly cow those are some big pinons. I was kind of expecting that but wow.

I am planning on running a CRC Gen X. What is the smallest spur you can get on one of these. Also anyone know what the total teeth you can put on the car is? (spur + pinion).

Thanks for the help guys!
Standard size diff rings work fine with a PRS 72 spur gear. I use that gear on my 12th scale and I ran it last night at OCRC. It will cover a broad range of roll outs. You'll just have to check with CRC if the motor slots will reach that far back. I'm sure they probably will.
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Old 05-21-2009, 12:42 PM   #31469
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Anyone know how big the CRC "pro cut" tires are stock?
You will have to cut down your tires for carpet. But don't worry, I have a truer you are more than welcome to use when I'm at the track.
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Old 05-21-2009, 12:58 PM   #31470
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It's really amazing to me how quickly the 1s Lipo has caught the interest of racers across the country in the 1/12th scale class. Even with the local class about 50% has made the move dispite there being a disadvantage as the rule is to go motor to motor. I expect the local track will be all Lipo by the end of the year and the 2010 points series will be lipo & brushless only.
jared were you running 12th? might have to come up and wreck... I mean race with you....
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