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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 06-05-2011, 11:39 PM   #35986
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Blue side springs are a little stiff, most guys I know running 12R5s use silvers or even greens. Try longer and shorter on the Jack and see if it makes a difference. You do need to wipe it really well, but any slipperiness should only last a lap or 2.
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Old 06-06-2011, 05:11 AM   #35987
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Quote:
Originally Posted by WildManDriving View Post
I tried 'Jack the gripper' for 20min no warmer on the rear, but I must apply to much and/or not wipe it off well enough as it was super slippery until worn away.

Tyres fr Magenta, rr Pink. Diameter from packet.
Springs fr .020, side Blue, center Gold.
Shock center 30wt, side damper 20wt.
Ride height 6mm fr/rr with 0.5mm pod droop and 3 shims on kingpin as per kit.
Camber -0.5, Caster -6.15.
Parma Speed8.
Bumpy low traction asphalt with both open and tight corners.

Any info I've missed is as per kit.
I'm assuming that the rear end is looser than the front. Other things you should try are a softer center shock spring and more pod droop. Both changes will help rear end traction on power.
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Old 06-09-2011, 12:28 PM   #35988
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Xray XII Link vs 12R5.1. Which and why? I don't mention the CRC because I've heard the plastics bend easily and it affects handling.
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Old 06-09-2011, 12:35 PM   #35989
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I used to run the CRC front end on my BMI..never had any issues with the plastics bending. If anything it was stronger than the old AE front end.
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Old 06-09-2011, 01:22 PM   #35990
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Xray XII Link vs 12R5.1. Which and why? I don't mention the CRC because I've heard the plastics bend easily and it affects handling.
12R5.1
Doesn't need any modifications to work well.
Very, very good out of the box.

Xray, nice copy of the 12R5.
Will get the job done
I know racers that have had both, and chose the AE car.

CRC, seems to cost less due to not having all the nice parts in the kit.
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Old 06-09-2011, 02:25 PM   #35991
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Originally Posted by Dane View Post
Xray XII Link vs 12R5.1. Which and why? I don't mention the CRC because I've heard the plastics bend easily and it affects handling.
Owned them all and On Carpet...CEFX Griffin has a tremendous amount of corner speed. AE 12r5.1 front end, IRS rear axle and hubs. HB cntr shock. and an assortment of other goodies.

They are all fine cars...Find one that suits your driving style when you are looking for those extra tenths!!!
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Old 06-09-2011, 08:49 PM   #35992
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Originally Posted by RedBullFiXX View Post
12R5.1
Doesn't need any modifications to work well.
Very, very good out of the box.

Xray, nice copy of the 12R5.
Will get the job done
I know racers that have had both, and chose the AE car.

CRC, seems to cost less due to not having all the nice parts in the kit.
Those "nice parts" are mostly all for show... Every major carpet race of the 2010-2011 season in 17.5 was won with a virtually box stock Gen XL. It fared pretty well in the 13.5 and Mod classes too. Not to mention Simo winning the Mod Euros first time out with the car. Plastic isn't necessarily bad.

I made the A at every regional and National level race I ran last year with my two seasons old Gen XL. The only "hop-ups" I have on the car are the Aluminum left side bulkhead, and the front-end H-brace in case I choose to go long-arm up front. Aside from freshening up some pivots, and the occasional bent kingpin, I've replaced nothing.

The bottom line is that nearly any of the latest generation of 12th scale chassis are good performers. CRC just has the best customer service, and a more complete 12th scale package, as far as tires, bodies, tube lubes, etc. Plus their team drivers are the nicest guys around........
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Old 06-09-2011, 09:16 PM   #35993
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The bottom line is that nearly any of the latest generation of 12th scale chassis are good performers.
QFT !


If it wasn't for Cyrul, Yokomo, AE, & CRC "Team" drivers would win every race, with cars that are not "KIT"

On-point Serpent conversions are cool too.
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Old 06-09-2011, 10:16 PM   #35994
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Ideally, you should try all of them, but that's probably not possible. They are slightly different and 1 may suit you more than another. I got nowhere with brand X, but went to the top of our local A by buying a Serpent 120L. A great car. At our last race, the top 5 were 12R5. TOP, 12R5, Serpent, CRC. If you're new to 1/12TH it might be well to go with a car used by some of the best racers at your track. That way if you need help, it's available.
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Old 06-09-2011, 11:03 PM   #35995
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Newer to 1/12 scale and I need some info. I will be running 13.5(viper) on blinky mode this sat. Never ran without boost so what gearing/ rollout would I be looking for? The track has about an 70' or 80' straight and pretty tight. Just want to make sure I am ready with pinion and spur choices for when I get there. Thanks for any info.
C.J.
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Old 06-09-2011, 11:39 PM   #35996
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Originally Posted by IIICJACKIII View Post
Newer to 1/12 scale and I need some info. I will be running 13.5(viper) on blinky mode this sat. Never ran without boost so what gearing/ rollout would I be looking for? The track has about an 70' or 80' straight and pretty tight. Just want to make sure I am ready with pinion and spur choices for when I get there. Thanks for any info.
C.J.
I am not sure that the Vipers run on 1S even with an external booster.
If anyone has got one to work please advise how?
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Old 06-10-2011, 08:09 AM   #35997
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Xray XII Link vs 12R5.1. Which and why? I don't mention the CRC because I've heard the plastics bend easily and it affects handling.


I run a CRC carpet knife and have never had a problem with the "plactics bending easily",the car is a good 12th scale and parts, if needed, are easy to get.
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Old 06-10-2011, 10:17 PM   #35998
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[/COLOR]

I run a CRC carpet knife and have never had a problem with the "plactics bending easily",the car is a good 12th scale and parts, if needed, are easy to get.
Thanks
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Old 06-13-2011, 12:15 AM   #35999
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Originally Posted by Besercoe View Post
I am not sure that the Vipers run on 1S even with an external booster.
If anyone has got one to work please advise how?
Sorry, it is a viper 13.5 motor with a tekin RS esc.
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Old 06-14-2011, 06:21 PM   #36000
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Originally Posted by CypressMidWest View Post
Those "nice parts" are mostly all for show... Every major carpet race of the 2010-2011 season in 17.5 was won with a virtually box stock Gen XL. It fared pretty well in the 13.5 and Mod classes too. Not to mention Simo winning the Mod Euros first time out with the car. Plastic isn't necessarily bad.

I made the A at every regional and National level race I ran last year with my two seasons old Gen XL. The only "hop-ups" I have on the car are the Aluminum left side bulkhead, and the front-end H-brace in case I choose to go long-arm up front. Aside from freshening up some pivots, and the occasional bent kingpin, I've replaced nothing.

The bottom line is that nearly any of the latest generation of 12th scale chassis are good performers. CRC just has the best customer service, and a more complete 12th scale package, as far as tires, bodies, tube lubes, etc. Plus their team drivers are the nicest guys around........

Come on, Ian. Tell the truth. You were one of the 10 best drivers at those events in your classes. You are quite the wheel , you know.
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