Help me understand Vekta.5 transmission gearing please.

[Ferrebee88]

Kraken Vekta.5 with ESP 34cc engine and full Vertigo transmission.
With stock tires I am currently running the 19t/22t configuration. I am installing the Maxxis Trepadore tires and need to lower my gearing to match the larger size tires. I am assuming using the 17t as the pinion and the 24r as the intermediate is the lowest gearing I can achieve with the Vertigo gears? I am hoping this is a good place to start and isn't too low.

I am assuming 17p/24 is the lowest, 24t/17 is the highest, and the 19/22 and the 18/23 are in_between?

 

[smokinwheel]

19/22 = 1.16 ratio
17/24 = 1.41 ratio


19.45 percent difference between the two.

what is the roll-out on the tires , old vs. new?

Need to see what that it and then you can figure out if the new gearing will be enough to get you back to where you are now.

 

[Ferrebee88]

19/22 = 1.16 ratio
17/24 = 1.41 ratio

what is the roll-out on the tires , old vs. new?

Need to see what that it and then you can figure out if the new gearing will be enough to get you back to where you are now.

Circumference of the stock tire is 22.5". The circumference of the trepadore's is 26.5".


If I put the 24t as the pinion and the 17t as the intermediate or 17t as the pinion and 24t as the intermediate, this produces 2 different results? Maybe I am over thinking, but it seems to me it would be the same, just in different order

 

[smokinwheel]

Tire is 16.3 % difference.

Gear change19.45 % difference.

Looks like 3.5% more gear , going to gain a little out of the hole and loose a little at top end.

 

[Ferrebee88]

I think what really threw me off is not realizing you could go 17/24 or 24/17.

Tire is 16.3 % difference.

Gear change19.45 % difference.

Looks like 3.5% more gear , going to gain a little out of the hole and loose a little at top end.

Thank you for the assistance! I'll be on the level one of these days.

 

[cmbscx10]

This helped me in the past but i am still trying to locate Transmission ratios for my Kraken RC's

https://scriptasylum.com/rc_speed/top_speed.html

 

[Seandonato73]

Tire is 16.3 % difference.

Gear change19.45 % difference.

Looks like 3.5% more gear , going to gain a little out of the hole and loose a little at top end.

Not just a size difference, but mass difference too. The trepadore tires are a good bit heavier vs stock, that gear set should be pretty ideal to deal with the size and weight difference, even if a bit of top end is sacrificed.

 

[Ferrebee88]

Not just a size difference, but mass difference too. The trepadore tires are a good bit heavier vs stock, that gear set should be pretty ideal to deal with the size and weight difference, even if a bit of top end is sacrificed.

I'm fine with sacrificing on the top end. I've never been a speed demon. I am boring and like nice controllable speeds.

 

[smokinwheel]

Not just a size difference, but mass difference too. The trepadore tires are a good bit heavier vs stock, that gear set should be pretty ideal to deal with the size and weight difference, even if a bit of top end is sacrificed.

Didn't think about the difference in weight/mass. Good point.
Breaking might be a little different as well. A little more rotating mass to slow down.

 

[Ferrebee88]

Here is a reference for anybody interested. The treps are 12.2 ounces heavier than the stock terrain dominator.

 

[cmbscx10]

^^^^
Wholly Fatty. I'll be getting them anyway. I'll slow down cause they look perfect compared to the stockers.

 

[smokinwheel]

Here is a reference for anybody interested. The treps are 12.2 ounces heavier than the stock terrain dominator.

View attachment 92798View attachment 92797

Yowzer , That is quite a difference.

Hey what are the baked goods in the background? You know we like food here too. LOL

 

[Rceverywhere]

I tried j concepts magmas, they made a sluggish truck compared to stock on the same gearing, I changed to mad max super grip they have the same diameter as stock, a bit harder but they chew up turf real good

 

[Ferrebee88]

Yowzer , That is quite a difference.

Hey what are the baked goods in the background? You know we like food here too. LOL

In the background... well that's a freshly baked Sourdough white chocolate strawberry loaf my wife baked this morning.

 

[smokinwheel]

In the background... well that's a freshly baked Sourdough white chocolate strawberry loaf my wife baked this morning.

and you get to use her baking scale to weigh your tires and wheels.

Where did I go wrong?? LOL

 

[Ferrebee88]

What can I say. I'm a lucky man!

 

[Ferrebee88]

Well, that sure took some effort to get into!