Answers to Chain Length, Gear Ratios, Sprockets, Speed in Gears.

[Viperam]

In my search to get info for sprocket swaps, extended swing arms, chain lengths, and speed in gears i spent way to much time trying to find everything i needed. So i compiled everything i found into this thread to make things easier for other people and reduce repeated threads. All the information is here, just not all in the same location. There are Calculators EVERYWHERE but they do not fill themselves out. You will need this information.

Chain Length
Gen 1 Stock Chain 530 pitch 112 links with a 17 Tooth Front and 40 Tooth Rear
Gen 2 Stock Chain 530 pitch 114 links with a 18 Tooth Front and 43 Tooth Rear

Stock chain within stretch limits can handle a maximum sprocket swap of
-1/+3
0/+4
+1/+5

Swingarm Extensions
Extended Add
0-3"______+10 Links
3-6" _____+20 Links
6-9" _____+30 Links
9-12" ____+40 Links
12-15" ___+40 Links or Add an addition 10 or +50 links for a 630 Chain

2 inches over add 6 links
4 inches over add 12 links
6 inches over add 20 links
8 inches over add 26 links
9 inches over add 28 links
10 inches over add 32 links
12 inches over add 38 links

Sprocket Ratio
Gear Front/Rear Sprocket Combinations
Sprocket ratio chart
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
28 2.80 2.55 2.33 2.15 2.00 1.87 1.75 1.65 1.56 1.47 1.40 1.33 1.27 1.22 1.17
29 2.90 2.64 2.42 2.23 2.07 1.93 1.81 1.71 1.61 1.53 1.45 1.38 1.32 1.26 1.21
30 3.00 2.73 2.50 2.31 2.14 2.00 1.88 1.76 1.67 1.58 1.50 1.43 1.36 1.30 1.25
31 3.10 2.82 2.58 2.38 2.21 2.07 1.94 1.82 1.72 1.63 1.55 1.48 1.41 1.35 1.29
32 3.20 2.91 2.67 2.46 2.29 2.13 2.00 1.88 1.78 1.68 1.60 1.52 1.45 1.39 1.33
33 3.30 3.00 2.75 2.54 2.36 2.20 2.06 1.94 1.83 1.74 1.65 1.57 1.50 1.43 1.38
34 3.40 3.09 2.83 2.62 2.43 2.27 2.13 2.00 1.89 1.79 1.70 1.62 1.55 1.48 1.42
35 3.50 3.18 2.92 2.69 2.50 2.33 2.19 2.06 1.94 1.84 1.75 1.67 1.59 1.52 1.46
36 3.60 3.27 3.00 2.77 2.57 2.40 2.25 2.12 2.00 1.89 1.80 1.71 1.64 1.57 1.50
37 3.70 3.36 3.08 2.85 2.64 2.47 2.31 2.18 2.06 1.95 1.85 1.76 1.68 1.61 1.54
38 3.80 3.45 3.17 2.92 2.71 2.53 2.38 2.24 2.11 2.00 1.90 1.81 1.73 1.65 1.58
39 3.90 3.55 3.25 3.00 2.79 2.60 2.44 2.29 2.17 2.05 1.95 1.86 1.77 1.70 1.63
40 4.00 3.64 3.33 3.08 2.86 2.67 2.50 2.35 2.22 2.11 2.00 1.90 1.82 1.74 1.67
41 4.10 3.73 3.42 3.15 2.93 2.73 2.56 2.41 2.28 2.16 2.05 1.95 1.86 1.78 1.71
42 4.20 3.82 3.50 3.23 3.00 2.80 2.63 2.47 2.33 2.21 2.10 2.00 1.91 1.83 1.75
43 4.30 3.91 3.58 3.31 3.07 2.87 2.69 2.53 2.39 2.26 2.15 2.05 1.95 1.87 1.79
44 4.40 4.00 3.67 3.38 3.14 2.93 2.75 2.59 2.44 2.32 2.20 2.10 2.00 1.91 1.83
45 4.50 4.09 3.75 3.46 3.21 3.00 2.81 2.65 2.50 2.37 2.25 2.14 2.05 1.96 1.88
46 4.60 4.18 3.83 3.54 3.29 3.07 2.88 2.71 2.56 2.42 2.30 2.19 2.09 2.00 1.92
47 4.70 4.27 3.92 3.62 3.36 3.13 2.94 2.76 2.61 2.47 2.35 2.24 2.14 2.04 1.96
48 4.80 4.36 4.00 3.69 3.43 3.20 3.00 2.82 2.67 2.53 2.40 2.29 2.18 2.09 2.00
49 4.90 4.45 4.08 3.77 3.50 3.27 3.06 2.88 2.72 2.58 2.45 2.33 2.23 2.13 2.04
50 5.00 4.55 4.17 3.85 3.57 3.33 3.13 2.94 2.78 2.63 2.50 2.38 2.27 2.17 2.08
51 5.10 4.64 4.25 3.92 3.64 3.40 3.19 3.00 2.83 2.68 2.55 2.43 2.32 2.22 2.13
52 5.20 4.73 4.33 4.00 3.71 3.47 3.25 3.06 2.89 2.74 2.60 2.48 2.36 2.26 2.17

When using Sprocket Caculators use these Gear Ratios For stock or reference the chart above for sprocket swaps.
Primary Ratio 1.596 For both Gen 1 and Gen 2
Sprocket Ratio is 2.353 For Gen 1, and 2.394 for Gen 2
Gear 1 - 2.615
Gear 2 - 1.937
Gear 3 - 1.526
Gear 4 - 1.136
Gear 5 - 1.136
Gear 6 - 1.043

Stock Tire Is 76.75 inchs or 1953.4mm in diameter if it is Bridgestone Battlax BT-015 190/50R17
Chain Pitch 15.8752mm

Rev Limit
10,800 Gen 1
11,300 Gen 2

Gearing Commander: Motorcycle Gear Ratio Calculator for Sprockets RPM Speed Chain (all around calculator)
Motorcycle gear/rpm/speed calculator (Motorcycle gear/rpm/speed calculator)
SPROCKET SPECIALISTS-Sprockets for all makes of bikes. (Chain Length and Gearing Calculator)
http://www.dropbears.com/u/utilities/images/Gearing_V12.zip (Easy program calculate thespeed in any gear at any given rpm)

 

[B@DA$$08BUS@]

Thanks for the info. Good write up.

 

[thechad842]

Great post lots of info!

 

[Professor]

Viperam

Great Data consolidation!!

One thing however, +1/+5 with a stock chain and arm. On my Gen 1 a 17/43 is pretty tight with a good chain. Are you saying I should be able to fit a 18/45?

 

[Viperam]

Viperam

Great Data consolidation!!

One thing however, +1/+5 with a stock chain and arm. On my Gen 1 a 17/43 is pretty tight with a good chain. Are you saying I should be able to fit a 18/45?

Im sure someone will chime in with firsthand experience but using the calculators and the research ive done, it seems that +1/+5 will nearly snug
(.012 or less than 1/8 inch)the rear wheel into the swingarm adjuster with just enough slack in the chain to be within suzukis recomendations.

Although im not comfortable with that limit because tight chains cause excess sprocket wear and parasitic power loss. With my luck, id get it that close and id run out of room for adjustment. But for the record, the measurements and calculations say it works.

If anyone knows it doesnt let me know so i can correct the chart!

 

[Professor]

I've got an 18/44 on my bike right now. I'll be swapping back to the stock swingarm in the next few weeks. I think I have my 112 link chain from the last setup still. We'll see how close I can get.

 

[scrappy]

i know at LSR they have been able to run bikes well over 250MPH, where do these guys get the sprockets? do they make them in their own shops?

How would a person get a sprocket set that let them run close to 260MPH?

 

[Hayabusa4life]

Lots of info here... Thanks!!!

 

[Rothman]

I think this deserves to be sticky/pinned

 

[HOAX]

sticky this post for sure.

 

[hawkti]

looking at the ratio chart,,a 16/40 is basically the same as a 17/43. Why is everyone saying the 16/40 so much harder on the chain?
what is the good and bad of this combo? trying to get some knowledge here

 

[sixpack577]

Good info, but only a reference. Just because gear ratios are the same on paper does not mean that the bike will ride the same with both setups. Example, the old -1 front = +3 rear, not true! You must consider the front sprocket, it's on the output shaft of the engine! If you drop -1 front, you begin to lose the ability to use all the engine's available torque, regardless if you add +3 to the rear. So drop -3 on the front and see how fast revving the engine becomes, and how much less torque is useable. The opposite holds true as well, if you just add teeth to the rear, the bike "feels" as if it has much more torque, as well as decreased top speed.
You must stay within a range of "useable" power for the engine. Gen 1 and 2 have different power curves, and are geared differently from the factory for that reason. It's best to know what you want the bike to be able to do, then play with gearing until you find what work's best for your application.
Changing gearing with stock length chains also shortens or lengthens your wheelbase, you can move it either way around 1 1/2" depending on which sprockets. This changes the handling of the bike.
A good reference none the less, but what the chart says as opposed to how any bike really reacts are two different things.

 

[LehreJet]

awesome post, thanks, very helpful

 

[DaytonaYellow]

Good info, but only a reference. Just because gear ratios are the same on paper does not mean that the bike will ride the same with both setups. Example, the old -1 front = +3 rear, not true! You must consider the front sprocket, it's on the output shaft of the engine! If you drop -1 front, you begin to lose the ability to use all the engine's available torque, regardless if you add +3 to the rear. So drop -3 on the front and see how fast revving the engine becomes, and how much less torque is useable. The opposite holds true as well, if you just add teeth to the rear, the bike "feels" as if it has much more torque, as well as decreased top speed.
You must stay within a range of "useable" power for the engine. Gen 1 and 2 have different power curves, and are geared differently from the factory for that reason. It's best to know what you want the bike to be able to do, then play with gearing until you find what work's best for your application.
Changing gearing with stock length chains also shortens or lengthens your wheelbase, you can move it either way around 1 1/2" depending on which sprockets. This changes the handling of the bike.
A good reference none the less, but what the chart says as opposed to how any bike really reacts are two different things.

you seem to know your stuff, Im trying to choose new sprockets now for my Gen2 for a run down the salt lake, so ultimate top speed over a 9 mile strip i want to get the most out of the stock bike. What would be the best way to go? change one or both front & rear? i can take a few out there with me to experiment and i'll need to bring a few chains as well for different sprocket combo's

 

[sixpack577]

you seem to know your stuff, Im trying to choose new sprockets now for my Gen2 for a run down the salt lake, so ultimate top speed over a 9 mile strip i want to get the most out of the stock bike. What would be the best way to go? change one or both front & rear? i can take a few out there with me to experiment and i'll need to bring a few chains as well for different sprocket combo's

I make no claims to know what's best.
Land Speed Racing guys would be better to talk to, even though they typically only run one mile.
I'm not sure what your exact goals are, but;
You will need a 41 tooth rear sprocket(will work with stock chain) or a 55 series(taller)rear tire in order to be able to break 200mph.
You will likely need a good full exhaust and dyno tune, as well as very good conditions(weather, wind, temp, humidity, ect.)
Your body weight and size(ability to tuck down and be more aerodynamic with bike)also need to be taken into account.
If you want to go any faster, you'll need a lot more hp.
What gearing for much over 200mph, I have no idea, but as said, a lot more hp. As the faster you go, the harder it becomes to continue to go faster.
9 miles is a long distance to be wide open.
You should be at top speed in at least a mile and a half, 2 miles if you accelerate very slowly.
I also have no experience with salt and dirt at extreme speed. You'll want to talk to someone experienced in that to ask for correct tire pressure. As well as any tips on handling. Salt will also eat your wheel bearings. It's like sand as it seems to find it's way into everything. Clean the bike thoroughly when you're done.
I have also heard and read that salt flat runs are deceptive in how you perceive speed. As the area is so long and so wide, it appears that you are going much slower than you actually are.
I can belive that; since traveling at 60 mph through a narrow street with buildings on each side seems much faster than 60mph on a 4 lane highway.
Got-Busa would be a good guy to PM. He does LSR, has a turbo Busa, and has enough experience to help point you in the right direction.
I've done many a 180+, and a gps'd 197mph on empty 2 lane highway(way over a mile and slight downhill), but that's where it ends for me. You definantley need to talk to LSR guys for specific info, as what you are doing is very serious.
Good luck with it.

 

[Thomas2006]

Hello new here, I am really enjoying all the good feedback and tips from experienced riders. I have a 2006 busa I just got back from my motorcycle racer/mechanic friend . Had vance and hines do a pro port job to my cylinder head, new cams, air box mod, muzzy full stainless system, carillo rods and stock crank/pistons.. ( this winter pulling motor back out to put different pistons and crank in btw) he also did a custom ecu flash/tune so I can spray 60 hp worth of nitrous. Im not doing top speed runs on the regular. Occasionally I might run it up but back down no long distance top speed. Mainly 1/8th and 1/4 mile stuff. He told me to run 1 down in front and 1 up in back. Im a 265lb rider so I know not to expect what a 140lb rider gets performance wise. Really looking for a second opinion on gearing and what other riders have experienced with there changed gearing. I also stretched the bike 9" over stock. Any advice or experiences greatly appreciated.

 

[nosbig]

I would say try 1 down and 3 up if your spending time at the track.

 

[dadofthree]

i know at LSR they have been able to run bikes well over 250MPH, where do these guys get the sprockets? do they make them in their own shops?

How would a person get a sprocket set that let them run close to 260MPH?

Sir, I don't care what sprockets you use on a stock Hayabusa you will struggle to exceed 200 MPH in the standing mile. Those guys are running 400 plus HP

 

[RacingJake]

I'm running 18 front and 54 rear on my flashed B King. At 5500 in 6th I'm doing 80 mph and at 11,000 it's at 160 mph. talk about roll on throttle.

BTW nice chart !

 

[RSXtypeS]

In my search to get info for sprocket swaps, extended swing arms, chain lengths, and speed in gears i spent way to much time trying to find everything i needed. So i compiled everything i found into this thread to make things easier for other people and reduce repeated threads. All the information is here, just not all in the same location. There are Calculators EVERYWHERE but they do not fill themselves out. You will need this information.

Chain Length
Gen 1 Stock Chain 530 pitch 112 links with a 17 Tooth Front and 40 Tooth Rear
Gen 2 Stock Chain 530 pitch 114 links with a 18 Tooth Front and 43 Tooth Rear

Stock chain within stretch limits can handle a maximum sprocket swap of
-1/+3
0/+4
+1/+5

Swingarm Extensions
Extended Add
0-3"______+10 Links
3-6" _____+20 Links
6-9" _____+30 Links
9-12" ____+40 Links
12-15" ___+40 Links or Add an addition 10 or +50 links for a 630 Chain

2 inches over add 6 links
4 inches over add 12 links
6 inches over add 20 links
8 inches over add 26 links
9 inches over add 28 links
10 inches over add 32 links
12 inches over add 38 links

Sprocket Ratio
Gear Front/Rear Sprocket Combinations
Sprocket ratio chart
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
28 2.80 2.55 2.33 2.15 2.00 1.87 1.75 1.65 1.56 1.47 1.40 1.33 1.27 1.22 1.17
29 2.90 2.64 2.42 2.23 2.07 1.93 1.81 1.71 1.61 1.53 1.45 1.38 1.32 1.26 1.21
30 3.00 2.73 2.50 2.31 2.14 2.00 1.88 1.76 1.67 1.58 1.50 1.43 1.36 1.30 1.25
31 3.10 2.82 2.58 2.38 2.21 2.07 1.94 1.82 1.72 1.63 1.55 1.48 1.41 1.35 1.29
32 3.20 2.91 2.67 2.46 2.29 2.13 2.00 1.88 1.78 1.68 1.60 1.52 1.45 1.39 1.33
33 3.30 3.00 2.75 2.54 2.36 2.20 2.06 1.94 1.83 1.74 1.65 1.57 1.50 1.43 1.38
34 3.40 3.09 2.83 2.62 2.43 2.27 2.13 2.00 1.89 1.79 1.70 1.62 1.55 1.48 1.42
35 3.50 3.18 2.92 2.69 2.50 2.33 2.19 2.06 1.94 1.84 1.75 1.67 1.59 1.52 1.46
36 3.60 3.27 3.00 2.77 2.57 2.40 2.25 2.12 2.00 1.89 1.80 1.71 1.64 1.57 1.50
37 3.70 3.36 3.08 2.85 2.64 2.47 2.31 2.18 2.06 1.95 1.85 1.76 1.68 1.61 1.54
38 3.80 3.45 3.17 2.92 2.71 2.53 2.38 2.24 2.11 2.00 1.90 1.81 1.73 1.65 1.58
39 3.90 3.55 3.25 3.00 2.79 2.60 2.44 2.29 2.17 2.05 1.95 1.86 1.77 1.70 1.63
40 4.00 3.64 3.33 3.08 2.86 2.67 2.50 2.35 2.22 2.11 2.00 1.90 1.82 1.74 1.67
41 4.10 3.73 3.42 3.15 2.93 2.73 2.56 2.41 2.28 2.16 2.05 1.95 1.86 1.78 1.71
42 4.20 3.82 3.50 3.23 3.00 2.80 2.63 2.47 2.33 2.21 2.10 2.00 1.91 1.83 1.75
43 4.30 3.91 3.58 3.31 3.07 2.87 2.69 2.53 2.39 2.26 2.15 2.05 1.95 1.87 1.79
44 4.40 4.00 3.67 3.38 3.14 2.93 2.75 2.59 2.44 2.32 2.20 2.10 2.00 1.91 1.83
45 4.50 4.09 3.75 3.46 3.21 3.00 2.81 2.65 2.50 2.37 2.25 2.14 2.05 1.96 1.88
46 4.60 4.18 3.83 3.54 3.29 3.07 2.88 2.71 2.56 2.42 2.30 2.19 2.09 2.00 1.92
47 4.70 4.27 3.92 3.62 3.36 3.13 2.94 2.76 2.61 2.47 2.35 2.24 2.14 2.04 1.96
48 4.80 4.36 4.00 3.69 3.43 3.20 3.00 2.82 2.67 2.53 2.40 2.29 2.18 2.09 2.00
49 4.90 4.45 4.08 3.77 3.50 3.27 3.06 2.88 2.72 2.58 2.45 2.33 2.23 2.13 2.04
50 5.00 4.55 4.17 3.85 3.57 3.33 3.13 2.94 2.78 2.63 2.50 2.38 2.27 2.17 2.08
51 5.10 4.64 4.25 3.92 3.64 3.40 3.19 3.00 2.83 2.68 2.55 2.43 2.32 2.22 2.13
52 5.20 4.73 4.33 4.00 3.71 3.47 3.25 3.06 2.89 2.74 2.60 2.48 2.36 2.26 2.17

When using Sprocket Caculators use these Gear Ratios For stock or reference the chart above for sprocket swaps.
Primary Ratio 1.596 For both Gen 1 and Gen 2
Sprocket Ratio is 2.353 For Gen 1, and 2.394 for Gen 2
Gear 1 - 2.615
Gear 2 - 1.937
Gear 3 - 1.526
Gear 4 - 1.136
Gear 5 - 1.136
Gear 6 - 1.043

Stock Tire Is 76.75 inchs or 1953.4mm in diameter if it is Bridgestone Battlax BT-015 190/50R17
Chain Pitch 15.8752mm

Rev Limit
10,800 Gen 1
11,300 Gen 2

Gearing Commander: Motorcycle Gear Ratio Calculator for Sprockets RPM Speed Chain (all around calculator)
Motorcycle gear/rpm/speed calculator (Motorcycle gear/rpm/speed calculator)
SPROCKET SPECIALISTS-Sprockets for all makes of bikes. (Chain Length and Gearing Calculator)
http://www.dropbears.com/u/utilities/images/Gearing_V12.zip (Easy program calculate thespeed in any gear at any given rpm)