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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 01-09-2010, 07:42 PM   #33136
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I had issues with Parma tires peeling off as well. The Jaco compound seems to be close to Parma but yet to see Jaco tires peel like parma.

Crc seems to be the way to go.
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Old 01-09-2010, 08:03 PM   #33137
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CRC's defintely are less prone to peel, but the rim is more fragile. Choose your poison . . .
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Old 01-09-2010, 08:32 PM   #33138
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To me, the Parma and Jaco tires/wheels seem to be identical except the Parma front wheels seem to be even looser in the bearings than the Jacos. I have had both peel.

The best thing I have found to reduce peeling is after truing, hit the outside edge with a tire file to make sure no rubber overhangs the wheel and then really round off that edge. Then glue the bead with thin CA. They can still peel but it helps.
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Old 01-09-2010, 08:40 PM   #33139
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Originally Posted by andrewdoherty View Post
CRC's defintely are less prone to peel, but the rim is more fragile. Choose your poison . . .
Which rims frt or rr are you breaking and at what spot on the wheel? I think I've only broken two wheels in several seasons of running the CRC wheels.....
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Old 01-09-2010, 08:42 PM   #33140
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Quote:
Originally Posted by wingracer View Post
To me, the Parma and Jaco tires/wheels seem to be identical except the Parma front wheels seem to be even looser in the bearings than the Jacos. I have had both peel.

The best thing I have found to reduce peeling is after truing, hit the outside edge with a tire file to make sure no rubber overhangs the wheel and then really round off that edge. Then glue the bead with thin CA. They can still peel but it helps.
Awesome advice for ANY brand of foam tire.
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Old 01-09-2010, 09:43 PM   #33141
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Originally Posted by CypressMidWest View Post
Which rims frt or rr are you breaking and at what spot on the wheel? I think I've only broken two wheels in several seasons of running the CRC wheels.....
I cracked nearly every front rim I ran on carpet at last year's Snowbirds...they still ran pretty good even cracked though. I was pretty rough on the car though so my results may not be typical.
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Old 01-09-2010, 11:06 PM   #33142
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Quote:
Originally Posted by CypressMidWest View Post
Which rims frt or rr are you breaking and at what spot on the wheel? I think I've only broken two wheels in several seasons of running the CRC wheels.....
Quote:
Originally Posted by InspGadgt View Post
I cracked nearly every front rim I ran on carpet at last year's Snowbirds...they still ran pretty good even cracked though. I was pretty rough on the car though so my results may not be typical.
Mostly fronts. The difference for me has been where the Jaco wheels may bend a tab shape in a hard hit, the CRC cracks. Sometimes all the way from inside to outside. I also broke two rears. One I am not sure exactly how it happened as I didn't notice it till I brought the car in after a race, and the other sheared off the 2 aluminum screws brushing next to a board on the straight. Half of the wheel was attached to the wheel and the other half passed the car. These were my first two pairs of CRC's, but I have seen similar failures from some others that tried them at our track. I've not ever broken a Jaco rear wheel in the 2+ years I've used them. Our LHS ordered the CRC's as tehy aren't able to get the Jaco's at the moment. Something to do with a fire at one of the facilities involved in making the wheels? Were wondering if Jaco will have to replace the molds if this is true. Might mean the bearing issue gets fixed . . .? I do love how the bearings fit in the CRC front wheels!
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Old 01-10-2010, 01:32 AM   #33143
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What I wouldn't give for a 38mm version of the old black composite Jaco rims...those were very tough rims and didn't degrade when remounting foam.
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Old 01-10-2010, 03:52 AM   #33144
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Those bodies actually pre-date the HPI buyout of the original Hot Bodies company, based out of New Jersey. They Mark 2 is the HB Toyota GT-1, very similar in handling to the Protoform Nissan P-35, The Mark 3 is the HB Nissan NPT '91 which handled similarly to the Associated Nissan NPT body. Compared to the modern Proto, Parma, and Black ART bodies the HB shells would be lacking in downforce.
Hi!
Maybe I will get some luck from Master and my AMR's bodies arrive to me
before race.

However, with mark 3 car should drive, it must

Regards!
m.
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Old 01-10-2010, 09:32 AM   #33145
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Quote:
Originally Posted by andrewdoherty View Post
Does this information sound right to y'all?

Parma and Jaco use the same wheel and the same foam to produce their 12th scale foam tires.

CRC uses their own wheel and a different manufacturer of foam. Some call this GRP foam, from Italy.

Are there any other companies to use the same foam as CRC, but mounted to a different rim?

I ask because I'm tired of the foam on the Jaco and param wheels peeling back. I can run a clean race and come back the edges are peeled. I tried CRC foams and ran them several times. I had several wrecks, board taps etc, and when all was said and done there was no peeling. he only problem was the wheels were more brittle and most broke before I could wear the foam down. I've never broken a Jaco rear wheel.

I'm basically looking to get the foam I like (CRC, or GRP?) on a durable wheel. Thanks for any help.

AWD

PS- If wanted to remove old foam from a rim, which solvent would you think would remove the foam from the wheel best? lol, you know where I am going with this.
If you haven't tried the yellow wheeled TRC tires, you might try a few sets. They are the smaller diameter wheel, but the tire is made for TRC by GRP. The same compounds have the same characteristics when compared to CRC. You get the wheel that is like a Jaco and the more durable sidewall like the CRC. If you true tires anyway, the smaller size works great. I use 44mm rears and 42mm fronts. On the rears, the "Granite" is the same as a CRC Grey-Low.

Here are some steps I used when I ran Jaco's in the past. I think the problem is a substandard adhesive used to mount the foam.
1) peel up the outside edge right out of the box (5-7mm wide).
2) apply 3M weatherstrip adhesive with a small screwdriver or scrap lexan.
3) massage the edge to get full contact.
4) after it cures, super glue the rim seam and sidewall.
5) shape the sidewall on a truer. I go for a 15* angle back from the rim and then liberally radius the shoulder of the tire.

Frankly, Jaco's are a pain in the @$$. This seems like a lot of work, but we don't have those damn brushed motors and round cells to maintain anymore do we?

I do steps 4 and 5 from above on every set of tires I run. Consistency pays off at some point? Or, it should, I think?

Aaron
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Old 01-10-2010, 09:41 AM   #33146
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Where do you get TRC Tires now?
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Old 01-10-2010, 09:46 AM   #33147
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Does anyone know if serpent will have 12 scale tires for there 12 scale? if so will they fit other cars?
mike
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Old 01-10-2010, 10:44 AM   #33148
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Quote:
Originally Posted by M.Abramowicz View Post
Hi!
Maybe I will get some luck from Master and my AMR's bodies arrive to me
before race.

However, with mark 3 car should drive, it must

Regards!
m.
I ran the mark 3 body before and it was stable and felt the same as a Speed 12 (at least to me). However, it was about 0.1 to 0.2 sec per lap slower than the Speed 12.
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Old 01-10-2010, 10:48 AM   #33149
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Originally Posted by whynot View Post
Does anyone know if serpent will have 12 scale tires for there 12 scale? if so will they fit other cars?
mike
They already do. The ones I bought were Xceed/Jaco prizm so yes, they fit everything.
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Old 01-10-2010, 11:09 AM   #33150
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Originally Posted by wingracer View Post
They already do. The ones I bought were Xceed/Jaco prizm so yes, they fit everything.
There are these ones too in a Serpent package. But just like others... They are Jaco Prisms.
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