What gearing for crt.5 on MM/VXL motor/ 3s?

[R00ST]

I posted this in the truggy forum, but noticed there are a lot of crt.5 users who post in here as well. I would like input from as many people as possible.

I will be running 2.2 tires, road rages for messing around on the street. I also have some slick 1/8 buggy tires that I will use for street (they are 4.1 inches tall).

For offroad I will be using regular 1/8 buggy tires (moab's/badlands @ about 4.25 inches tall). I also have some pretty good sized ofna blazer sst tires which are about 4.5 inches tall and 2.25 inches wide. These might be overkill on the crt.5 but I would like to try them.

What should I start with for gearing? I would like about 40mph top speeds (45 would be fine). I dont want to be over or under geared. Another member helped me figure out the stock tires with .3 inches of ballooning will be about 41mph geared with a 14 tooth pinion.

I just want to get one pinion first to help save on the cost (cant afford to just buy 4-5 pinions @ 15 bucks each!). Should I start with a 12 so I can run my offroad tires for sure? (and then depending on how that runs, go with a 14 or so for the onroad tires?).

Thanks!
Mike

[R00ST]

I would like to keep temps down as well as squeeze runtime out of my 3s 5000mah packs, which was my thinking for the 12 tooth. If I run 4.1-4.25 tall tires for offroad I would assume this will be about the same mph (40) compared to the 3.5 stock tires considering the ballooning factor (the 1/8 buggy tires will not balloon that much as the sidewall is so thin).

Anyone run this same setup on the crt.5 I have heard a lot of people say this is a good combo, but cant seem to find anyone that actually runs it!

[GO-RIDE.com]

What adapters are you using to run the 1/8 buggy wheels?

[Arct1k]

integy IIRC sell them for the stampede/rustler which should work on a crt.5.

They used to do narrow ones now I just see these

http://www.rcplanet.com/Integy_Ext_W...ntt7979gun.htm

[BrianG]

Wow, those push the pivot point wayyy out there! That's gotta affect turning performance, or at least be hard on stuff..

[Arct1k]

I know they suck... I did the nitro rustler front end on my pede so have a set of jato 17mm adapters. They don't push the wheel out at all...

I have the new era ones...

http://www.neweramodels.com/item.cgi...q&part_id=3244

Expensive but you could buy two sets and just use the rears...

[BrianG]

For some reason, I just now realized the OP wants to put buggy tires on a CRT.5! That's gonna look.... odd. Not to mention you are gonna have to gear WAYYY down to compensate for that large tire size. I dunno, I think 2.2" tires are a perfect match IMO.

[Arct1k]

Ahh not too bad - I've run the stampede talons before which are 4.6 which is about the same as some offroad buggy tires...

Onroad buggy tires can also be smaller around 4ish

[GO-RIDE.com]

I agree that at 4.5" dia the 1/8 buggy off-road tires are probably too big for anything other than running through grass or flat dirt lots. I would want to do much jumping with that big of a dia because there would be no chassis slap and thus the arms would take all the load on big landings. I find that to be the case even with 4" 2.2 truck tires although that's what I run most.

[R00ST]

Yes I have those integy adaptors. I have two sets so I can run all 4 of the smallest adaptors (which are about 3/4 inch). This should be about the perfect addition of offset on the extended chassis. The buggy onroad tires are almost 4.0 exactly. The offroad buggy tires are 4.2 - 4.7 depending on the tread.

Seeing as how mashers are 4.9, and talons are around there too, I dont see how a 1/8 buggy offroad tire will be ridiculous on the crt.5 It will be about the same height but much narrower, which is less rotating mass (easier to turn, easier for the suspension to move, and less weight to snap parts).

Yes there will be extra leverage due to the 3/4 adaptor, but buggy wheels mount flush to the outside of the wheel, so I wont be getting all that much of an offset (1/4-1/2). Should work out well.

I think I am going to try a 12 tooth pinion first...possibly 13. This should be plenty low for even the 4.7 buggy tires.

Instead of getting two sets of the new era jato 17mm adaptors, why not just get one set of the rustler/stampede ones? They are equal offset (unlike the integy) so it would not require two sets to get equal offsets front/rear.

My reasoning for getting two sets of integy's is so I can use the smaller ones and get the offset (where as the new eras do not have any offset).

I will post some pics once everything is installed. Worst case scenario is there is too much heat/ stress on the drivetrain and going to 2.2 tires/wheels will fix that (although they weigh the same/more/less than 1/8 buggy tires depending on the tread).