Choosing Rear Sprocket and Gear Ratio Calculations
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- čas přidán 19. 01. 2014
- Having trouble determining what size rear sprocket that you need? Or how to calculate the top speed of your bike? We will explore the differences between 36t and 44t sprocket as well as quickly show you how to use a program called GearRat, where you input the information of your drive chain to calculate a theoretical top speed.
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I have become a first owner of a kent motorbike and would like to say thank you so much for your videos, I have had to scrap and save to get it,the mechanic who's put it together for me did great.. Now I can fix and tweak it to my likeing next year ..thanks once again..
Good job, I liked the details you explained them very well.
Kudos to you JMP! Excellent channel; very professional.
Why post a video, and reference a gear program / calculator, then not give the link to "Gear Rat" ???
Your videos always teach me something, even if it's a very small bit of info, I always feel I come out knowing just that much more. Do you guys sell parts? Where are you located?
ive wacthed many vids and couldnt help you helped alot
Great job. Loved the video. 👌👌👌❤️
I have a 36 tooth, and it's definitely ambitious in my area. I've upgraded my engine, so I can go 37mph on flat road, but even a slight grade will gradually slow me down to about 20mph. Steep hills are a problem, and require hard pedaling and great restraint with the throttle, to prevent engine damage. I popped a crank seal, so I'm currently rebuilding and upgrading it. The idea is to make enough power to get up hills without lugging the engine or popping a seal. Fingers crossed...
hello sir..i got a ns150 kawasaki, im 61 kl. what is the best combination of sprocket should i install?
Dope I have the high compression chamber looking for something to take the torque off the back rim I'm riding on flat ground and I'm on my third rim
I have a racing engine with performance exhaust and head and I went with the 40 tooth sprocket and I can go anywhere. hills don't slow me down at all and for everyone who rides bikes with engines buy a chain breaker they really come in handy!
my motorcycle have 21T drive gear & 70T clutch gear.im using 14T on engine & 47T on driven sprocket.what is best sprocket combination to be use in order to run faster?
Thanks a lot. Helped a lot.
can you go small to the same ratio on the rear axle gear as the same as the front on a go cart my has the torque converter on it to but dosent want to pull up a hill or take off fast any info
THANKS juice, hey this is unrelated to drive ratio but I notice in the vid that you have a welded area in the clutch section, I have noticed this in other vids, is there a weak spot I should know about? LOL
Nice video, you are very knowledgeable
I m riding hill climb in using cb 125 bike in srilanka what are the most suitable sporcket for my bike.
Be awesome if you could provide a link to the program or upload it to mediafire.
So for someone who's carrying weight and in a very hilly area would a 56 tooth sprocket make climbing hills a little easier? I have the stock sprocket right now and I am a relatively large guy and I pull a trailer of up to 100 lbs the hills around me are substantial and I have to work rather hard to climb them which is the reason for finding this video.
sir please answer this. if i have ratio which is 52/19=2.7:1 and then i change to 47/17=2.7:1. who is the lightest one?
Whats the biggest sprocket you can get & how fast it will go. I what this to ride around my property some of it is hilly. Im not interested in speed.
Cool tutorial!!
Matthew Schurter brought me here, great info resource, subscribed!
hello. I was wondering if you have some advise. I have a motor like in your video that I've put 3000 miles already and changed the camshaft and bucking bar. I made a video about it if you see it I hope I gave out good advise. My question is , is there anything else I should change at his point..? The ball bearing? how do I get that out? the chain? mine looks good. I'm too chicken to open my motor like I see yours. Any help is appreciated .
I have a large 54cm road bike frame running on 700cx32 wheels.rather hard,tall,thin wheel. I am 6ft,but only 185lb. My 80cc engine has performance carb bbr and expansion tube exhaust.now with a 44tooth sprocket,will I climb steep grades ok? My city is like San Francisco hills. Or would I be good with a 41?
I have a 14/50 in my yamaha r6 2002 was that a good idea?
the wee thing you were on about was a"wood ruff key", i would like to get an 11-tooth for the front but you`d maybe need to modify the casing at the top. it would be easier to change than the back one.?
I have a 2 stroke, and i am placing it on a Huffy Nel Lusso Cruiser bike. Somehow the Hub nut cold froze to the bolt and it is not coming off. Do you happen to have a rear axle for this type of bike, and how much would you charge me for that. someone told me it would be better to put a Free Wheel on the back. and put a hub mount instead of what comes with a 2 stroke kit. The one i purchased is a 36 tooth, and the hub mount is a 1.5 " Diameter .. please let me know what my best option would be...
I would like to make a motorized fixie, I had the idea of using the flip flop hub sprocket with 16 teeth, I know it's small bout how fast would it go?
Thank you for taking the time to teach us a few important things about this motorized bike hobby man! Keep it up also would anyone happen to know why my bikes engine vibrates really fast once I reach near top speed of my SD stinger 66cc/80cc engine?? I don't have any idea why it does that but it seems like the bike struggles to reach its full potential
Bryant,I have same issue,feels like I got more "go" but can't seem to get there,anyone??? Thanks
@@mattdoherty4276 exactly
I have BBR mag rims. How do i fit a larger rear sprocket? My brake caliper is right in the way. It seems if i go any bigger it wont fit.
Can i put one of this on a flip folp hub be for i buy one 1.25 hub will it work
I Google the name GearRat and I got nothing where is this website or app would like to know more
changing sprockets is usfull in some circumstances but there are lots of variables to consider and the rider is the first thing due to weight of the person then the terrain eg road or offroad flatland or hill climbing
I have a 5 hp gas engine with a 10 tooth clutch and want to know what would be a good rear sprocket for this (a 420) chain would a 54 tooth or a 60 tooth sprocket give me more pulling power? thanks. p.s. love your u tube demos.
Yah get a 12 tooth with a 54-44 tooth sproket
Where can I find GearRat?
Can u move the drive sprocket around on the shaft for chain alignment?
no
woodruff key is the little half moon key you was trying to work out 👍 lol
I cant find GearRat, can someone send me a link or tell me where to get it !
EBay has sprocket adapters for motorized bicycles I just got a 36 tooth only have three holes and not like the bicycle ones where they have nine to put in
http :// jimsitton . net/ ratiocalc/ gearratio. exe
I pulled the bucking bar to grease it, and bearings came out. Any suggestion on how to putt them back in place. Thank you.
Just stick em back in
What rear sprocket I can use with a 12T sprocket for the engine??
36T would fit fine..
The IDEAL for good torque is 35:1, but the MINIMUM is 21:1 to at least have ANY power under 20km/h. This is for 26in wheel sized two stroke engines.
My bike is Making a clunking sound as the front sprocket on the engine turns. Any idea what it could be juicemotoparts?
im having the same issue
I have a 44 the sprocket and my bike tips out at 37 mph so what would a 38 or a 40 tooth sprocket do? Is it safe to say an extra 10 mph?
Anthony P it will for sure increase the speed.
Avenir Pulukchu thnx thats what I was thinking
Anthony P Did you do any other mods to your bike to get it to go 37mph?
I think he means 37Kmph not miles
ive heard it explained to me to a 44 tooth sprockets about 28-29 mph flat ground 200 lb rider ect. for every tooth taken off the 44 is 1 mph gain
What's the name of the key that secures the 10 tooth sprocket? Where can I order one? Thank you in advanced!
Wood drift key, and you can buy them at hardware stores.
I wondering about the ratio, if the result of 4/8 and 6/12 =0.50 , then the speed-torque-acceleration will be performance the same or something will be difference.
According to the same ratio but difference sprockets, then how can we know which one are better or appropriate to use?
Thank you so much.
Google "go kart speed calculator" BMI Karts has a nice calculator to use. on a small engine, 1 speed vehicle you want to stay around a 5:1 gear ratio unless you have a lot of power. Anything lower will burn up clutches. A 6:1 ratio will give you faster acceleration but less top speed. a 4:1 ratio will give less acceleration and more top speed. 12t clutch and 60t sprocket gets you 5:1, 12t clutch 72t sprocket gets you 6:1. I wouldn't go a 17t clutch as they are more for weedwackers and chainsaws but I build go karts and not bicycles.
Karnjanapas Narupon did you get an answer I have been asking the same question I race go karts and was wondering
Hey, I'm thinking of going from a 4 stroke to a 2 stroke because 4 stroke transmissions are crap quality & a bitch to work on & had my 4G transmission brake on me for like the 3rd time this year. plus I hear 2 strokes are much faster anyway. Now I'm wondering, could a 2 stroke motor sprocket be adjusted to clear a wider rear tire so I can align it properly with my rear sprocket & so the chain can clear my rear tire? 4 stroke mounts made this easy by having slots drilled into the mount to allow the whole engine to be moved if needed but 2 strokes don't seem to be able to do this in the stock mounting configuration.
If you have a bike then don't complain about this shit just bit your tongue and get over it
i have a 68 tooth sprocket on my Go-kart axle. i need a smaller sprocket for my electric motor. my teacher said from around 10-15 teeth will do but i don't know if any sprocket size is ok soo what do i buy for it?
King Fancy thanks mate. another question. how do i find out the pitch of my 68 teeth axle sprocket, so i can buy my 11 tooth sprocket with the same pitch?
thanks man. appreciate it :D
I modify my bike, but I do assist went it come to climbing up hill.
i would like to see the gear ratio program i dont see it or can find it
google "go kart speed calculator" BMI Karts has a nice calculator to use to determine gear ratios and top speed.
there is a gear kit for 7 gear to go 60 mph it is 139.90 at a website if you search standerd gear kit for a skyhalk gt bike so you can shift threw gears
the problem with some bikes are the speedo sensor are taking the speed reading from the front sprocket, changing sprockets size may show the wrong speed on the speedo.
Wrong
Cool!
Im 350LB and I use a 44 tooth gear and I can do about 43 MPH no problems but I build strong engines !
Think of it this way. 1/44 tooth sprocket gives you more low-end torque for climbing Hills. So less pedaling. 3 6 tooth sprocket will give you more top-end. But you have to Pedal harder going up the hill. It's that simple. If I could buy 50 tooth sprocket I would. Just to pull the hills I don't need to go 35-40 miles an hour
just ordered a 68 tooth for my X2 110cc drag bike
How did it work out?
I need to buy a chain suggestion? Something tight and we'll made.
Hey bro, I have a 200cc Bajaj Pulsar and it reaches easily 113 Kph. Sometimes it reaches 125 kph but because my corroborator needs to clean up and engine is well firm, it doesn't vibrate. I would like my bike to run 150 kph. what sprocket(s) size(s) do I need?
not your forum friend go to your local shop they will help
A pulsar can't go 150km
My 44 tooth will do 35.4 but I have a dellerato carb and a better cdi...
Ask what kind of power you have, and then you can ask about terrain. If you have upgrade parts and stuff and run at 5 to 10 horsepower, you might want to go down to a 36, or even down to a 20.
can u make a vid about how to take the engine 10 teeth sprocket off ???? plsss man plsss i really appreciate tht
"Jears" got me.
Why are there no vids or reviews on 38 and 40 teeth
Small sprockets will make you go faster in the long run but not in the beginning it makes a top speed not quickness you can find them on Amazon I bought a 32 tooth on Amazon and I bought a 6 0 Universal tooth
I'm pulling up 36 online the kit comes with a 44
My clutch is sticking and it won't engage
I couldn't find Gear Rat either, but did find this site instead. Just input your year, make, model, etc., and click on Load Gearing, and the program sets up everything for you. You make changes in the spaces provided and go from there. The site has a lot of cookies that my ad blocker on Firefox doesn't like, so I had to go to the site using Explorer instead. Deal with that part on your own if you so choose. The website is gearingcommander d ot com. Pretty impressive information it gives out.
i have a cg150cc eagle bike an I have a 17 at front and 34 at rear will it cause any harm
yes the engine can explode take my advice
damn thanks man i guess I have to put on a 36 then
+kensen fujihari no it cant
no it cant its kool but the rear sprocket can be a lil bit smaller dawq if z want to change it but it wont blow up on u
So if you want to change the size of your sprocket you have to change the gear ratio?
Backwards-if you want to change the gear ratio you have to change sprocket sizes.
i he a 28 tooth rear sprocket on my 49cc two stroke motor and its slower then the 44 tooth stock sprocket why is that????????? my bike is a 700c 28" tire road bike and I weight 190, roads flat could you tell me why????
what I did was put a 80cc top end on the 49cc bottom end and its just fine now
+Brandon Mullis The 80cc so called engine kit actually on makes the engine 66cc ,research , its all a scam to sell the kits ..
Can you increase the size of the front sproket wheel? The one in the engine....
i don't think you can sorry
ya its shitty lost my CDI unit to....
Yes you can I have a 11 tooth. You can get 12's also
For anyone interested, soon I'll be uploading videos of my 38.1:1 5HP 2 stroke motorized bicycle with top speed of 60km/h on the top gear. Teaser is up right now.
On eBay Google sprocket adapter and sprocket for motorized bicycles they go from 32 tooth all the way to 44
Donnie they mount to the manic mechanic hub sprocket system, you can find them at pirate cycles. Com..
👍👍
In other words if you want quickness go with a bigger sprocket if you want long top speed on straight roads go with the smallest
you want more power? Turn that HEAD 180°.
I've wondered about that. Do I have to change anything if I do that?
I got a 35 tooth and the chain ain't fitting right! What's wrong with it?
It may be a different size (compared to the chain/link size)
@@Nextrevit I finally figured out what was the problem. The rear sprocket was a bad design from the factory. So I had to get another one.
@@jameswil7687 Alright
Word is that the factory sprockets from the factory are junk. Find an after market one to replace it.
@@napoliansolo7865 I found one. Thank you! Now I know what the manual says, 20.1 mix for fuel. But will a 25.1 hurt it? My top speed is 36mph with a tail wind and I weigh 110lbs so why no more speed?
I can pull the gut out of my muffler and gain a big difference in torque. But my horsepower is gone and it dranks gas like there's no tomorrow. Why is that?
Thank you
It's a crime that you didn't at least show us the top speed for common rear sprocket sizes while you had the gear rat up...just a few clicks. On a different note, there are many comments on 20 tooth sprockets and going 60+ mph...I'm adventurous AF and theres no way I'd want to do more than maybe 35 or 40 mph on a bicycle..especially one with solid suspension. All it'll take is a small pothole or a chunk of hard mud to send you over the bars and likely the hospital. I've taken tumbles on regular bicycles at full pump that almost killed me. I've taken two spills on the my aluminum china cruiser both at under 10 miles an hour and I'm still healing, still riding, but dam if my legs weremt cut to shreds by the gas tank edges as i went forward..and that's after i lined them with some red electrical tape for just that reason. Also thats whilst i wearing jeans...something to think about.
For racing tricycle 16-48 =3.00
if i lower the number of teeths on my driven sprocket, will changing the air filter from the stock one to an professional air filter balance everything??
shubham more wtf are you asking
And if u lower the amount of teeth on your driven it will increase top speed but less torque the only way to keep torque the same and increase top speed is increase engine size or increase max rpm
Bro, you need to readjust the engine so the carb float is level. It needs to go down and tiltedup, front up some, and same for back. It ill run much better, trust me I have built over 42 bikes.
I have 12-28t 65+
What did u have to do too mount a 12t and where to u buy it?
can it go 40mph?how?
you need a lot of high performance upgrades. i got a new CNS High performance carburetor and now i can go 40 miles an hour i also weigh 144 pounds.
You can also try using a 36 tooth rear drive sprocket or if your bike has gears you can try a jackshaft shift kit. I've heard of people getting up to speeds of 50 or 60 mph with these mods.
the moter in funt of u is a 90cash moter the ones i get r 180cash and ther rings and alll the studs rrr 2 times as big as yrs what she sed
40-43 mph on a stock engine 36 tooth sprocket but i guess im a pretty light rider
great, now try a 10 tooth sprocket and tell us how fast you get
38 teeth small sprocket and 38 teeth Large sprocket how is faster bike small and Large
The bigger one will still not go as fast as the smaller one it's just quicker in the beginning
Why wouldn't my motobike go faster if I made my machine a 110cc its only making 80 just like my old bike
so less teeth=more speed?
I'm like 93 pounds so what would be a good gear ratio for me
Ok 08
Not on a 100cc
What happens if you put a ten tooth to a ten tooth? 😂😂
omg...
the engine would stall.
I'm 376 lbs. My bike gets up to 75-77mph
What ever happend to this channel? Why did it die
Work on commentating please
Vasily Custom Builds lol you had to edit because you misspelled commentating the first time😂 ooofff
Ummmm ummmm ummmm ummmm ummmm ummmmm ummmmm
Jesus.. settle down and focus bro..
Folks that dont know this stuff are totally lost right now...
Wow u r bad at simple ratio calculations.
Bro you're so hard to listen to do you talk much? Terminology is screwed up too choppy you should have practiced
Crap info. Way too many assumptions.
very poorly explained,very bad videp
you are jealous cause this video made you feel stupid HA HA HA!