Suggested Gear Ratios for various setups

[South Kart3377]

So many people on here ask for gearing. So here you go-
DISCLAIMER: WARNING This chart was made with 16 INCH TIRES DO NOT USE WITHOUT ADJUSTMENT IF YOUR KART WILL AND/OR DOES HAVE LARGER THAN 16 INCHES!

STOCK IS DEFINED AS 200 POUND KART, 150 POUND ME AND 16 INCH TIRES!

5 HP Stock Gearing Chart
TC /Cen Clutch
Off-Roading 6:1, 7:1 / 8:1-14:1
Yard riding 5:1, 6:1 / 7:1-12:1
Flat Riding 4.5:1- 7:1/ 5:1-7:1



6-7 HP Stock Gearing Chart
TC / Cen Clutch
Off-Roading 5.7:1- 7:1 / 7:1-14:1
Yard riding 4.7:1-6:1 / 6.5:1-12:1
Flat Riding 4.4:1- 7:1 / 6.4:1-7:1



7.1- HP Stock Gearing Chart
TC / Cen Clutch
Off-Roading 5.5:1-7:1 / 7:1-14:1
Yard riding 4.5:1-6:1 / 6:1-12:1
Flat Riding 4.3:1- 7:1 / 4.7:1-7:1

Alright Now Newbie's I will just post a link to this page if any more gearing Questions arise. Moderaters Improve if needed.
Edit: Credit goes to Landuse and the my own experiments.

 

[South Kart3377]

Hello mods would you please move this to faq section

 

[Doc Sprocket]

Done.

But before we rubber-stamp this, there are a few questions. Where did this chart come from? Credit where credit is due. Got a link?

"Stock" gearing? Stock for which kart(s)?

I would also like to add that these ranges may cover the ballpark, but there are so many individual variables that there just is no substitute for a calculator.

 

[South Kart3377]

Done.

But before we rubber-stamp this, there are a few questions. Where did this chart come from? Credit where credit is due. Got a link?

"Stock" gearing? Stock for which kart(s)?

I would also like to add that these ranges may cover the ballpark, but there are so many individual variables that there just is no substitute for a calculator.

Stock with a 200 pound kart, I made the chart.

 

[Doc Sprocket]

Sounds alright by me!

 

[landuse]

Edit: Credit goes to Landuse...........

Wow. I AM FAMOUS. Please take everything I say with a pich of salt. I have learned everything I know from this forum, and nowhere else. I was a total noob before I started reading all the posts here. I still am. All I can do is repeat what people have said here already.

With that said, thanks for the credit

Edit: I have also added this thread to the Helpful Links Sticky

 

[South Kart3377]

Wow. I AM FAMOUS.
Edit: I have also added this thread to the Helpful Links Sticky

Thank you, for putting it in your sticky. You and the forum deserve the credit.

 

[r_chez_08]

Those values seem reasonable.
I wonder if I could make a simple excel calculator which could change the variables, and you could enter different wheel size and weight, and the variables included in this thread.
I dunno if I could link it to the forum though.

 

[souperman000]

Wow. I AM FAMOUS. Please take everything I say with a pich of salt. I have learned everything I know from this forum, and nowhere else. I was a total noob before I started reading all the posts here. I still am. All I can do is repeat what people have said here already.

Wow. I never would have guessed that you were a total noob before. I too have learned everything from this forum and have been able to teach other people better and sound smart..lol

Thanks Guys

 

[Doc Sprocket]

Those values seem reasonable.
I wonder if I could make a simple excel calculator which could change the variables, and you could enter different wheel size and weight, and the variables included in this thread.
I dunno if I could link it to the forum though.

Actually, I do use an Excel-based calculator. For the amount of times I figure ratios for myself and others, it's waaay too much work to do it manually!

To be fair, may calc does not factor in weight or purpose. That's up to my own discretion. However, I have altered it to include the possibilities of extra gearboxes (like a RAGB that may not be 1:1) and the primary redux ratio if you are using a motorcycle engine/tranny.

 

[souperman000]

just found this on BMI, gearing chart

http://www.bmikarts.com/item/Gear-Chart-for-35-Ratio-Lazer-Etched-Alum-613550-7798

 

[South Kart3377]

just found this on BMI, gearing chart

http://www.bmikarts.com/item/Gear-Chart-for-35-Ratio-Lazer-Etched-Alum-613550-7798

All that tells you is (10 tooth clutch 60 tooth axle=6:1 which means for every six turns of the engine the axle turns once.) Does that make sense??? Thats how this works.

South Kart

 

[landuse]

just found this on BMI, gearing chart

http://www.bmikarts.com/item/Gear-Chart-for-35-Ratio-Lazer-Etched-Alum-613550-7798

That chart is being sold for $33. That is crazy. I can read everything on the chart just looking at the picture. Who is going to buy it if they can just save the jpeg off their website?

 

[r_chez_08]

Wow! I would rather work it out on a calculator in 3 seconds...
Toystory- do you think you could get your calculator to work on the site?

 

[Doc Sprocket]

Wow! I would rather work it out on a calculator in 3 seconds...
Toystory- do you think you could get your calculator to work on the site?

I don't know... Since it's an Excel spreadsheet, I think users would have to download it. I can talk to Robert about making it available for download from the site, but I have to finish revamping it. I swiped it from another site somewhere (I don't remember where) and modified it with the additional calculation ability. Since it still resembles the original somewhat, I need to make it "mine" before I republish it.

 

[Kaptain Krunch]

Without putting in a tire size all that information is useless and could misguide the people it is directed towards (inexperienced kart builders). someone may be trying to use 25" atv tires for their off road kart, and see your chart and decide to gear it 8:1 with their centrifugal clutch. which obviously would not end well.

 

[landuse]

Without putting in a tire size all that information is useless and could misguide the people it is directed towards (inexperienced kart builders). someone may be trying to use 25" atv tires for their off road kart, and see your chart and decide to gear it 8:1 with their centrifugal clutch. which obviously would not end well.

I agree that there are so many variable to the equation, but maybe we could put a disclaimer on the values stating that tyre size is not factored in???