simple

iTrader: (2)

Then, for someone to step up, you'll need to provide more information (general track description, dimensions, length of straight, etc...).
For rollout, motor and tire diameter are only part of the overall equation...
Hopefully then, someone will have a similar configuration to provide a starting point.

trackdesigner71

iTrader: (6)

Simple is right. There's a lot that goes into calculating rollout even with these new rubber tires. Rollout on a...for instance...88x54 indoor track with ETS carpet will be different compared to 90x60 prepared asphalt track so the more information you can provide, the more people can help you.

TOM MAR

iTrader: (3)

Go to Team and Company Discussions & last page of the team scream thread. I asked the same question there.
I have not been to the track to try it yet, but plan to.
gearing & timing #2555 #Timing2557

Dan

iTrader: (75)

For those running SJT tires on black carpet with a spool. Do you guys feel an aluminum chassis takes away too much grip?

0010

iTrader: (4)

Another gearing question. We run GT12 with a 21.5 1S battery, not 2s like many do. Does anyone have a starting roll out? Motiv MC2, medium bite black carpet on an 85x50 track.

For regular 1/12th I am usually at around a 78mm rollout on this track with a 17.5 Team Scream motor.

Thanks in advance!

phatboislim

iTrader: (26)

I run about a 90 with my mc4 if that helps any

BullFrog

iTrader: (4)

Can't help as our track is bigger. what size tires? I start with 41mm but mine are alittle tall for some. Spur gears anywhere from a 68-72 - Pinions ??? You just have to experiment or ask some of the guys running that class. There are other things I've tried but - Bodies do make a difference some work and some don't. Chassis set-up is another.

0010

iTrader: (4)

I am using the SJT tires and those are 41mm. I will also start off with the Bitty Agata body. I will start off with a 90mm roll out and adjust from there. Thanks to both of you!

phatboislim

iTrader: (26)

Haven't tried spur gear changes in 17.5 yet but have with gt12...72 works better than 68 for me. Car just puts out faster laps with the 72. Tires are specs with 40s and below. My car hates anything with higher than 40mm tires

BullFrog

iTrader: (4)

The Agate for me works ok. Ive been using Akura and blitz 60909. As for the Alum chassis I run the no flex CRC chassis both indoors and outdoors. Just got some new spurs to try but it will be awhile before I try them. I also run the CRC tires cut down.
As for the spur gears it really depends on the chassis. CRC car run anything while the Awesomatic 68-70- from what I've seen.

0010

iTrader: (4)

I ended up at 87.59 mm last night. Was pretty good, but I need to play around some more. I didn’t have much time, so I didn’t try all the things I wanted to last night. Thanks!

theproffesor

iTrader: (66)

I’m in need of a replacement wing for a 1/12 Bitty AGATA. Does anyone make wings you can get separate like you can for 1/10?

BullFrog

iTrader: (4)

If you were here in Fla I have a used one I'd give you.

trx-1racer

Decided to build a GT12... Here it's 1S 21.5 blinky open tires SXT sauce. They might come up with a spec tire, but for now, common 1/12 foams... Sanded epoxy concrete surface. Got gears to go from about 85 to 90 rollout. We'll see how that works.

mrreet2001

iTrader: (9)

are you still looking for one of these?