Re: Calculations for the Engine RPM with the Vehicle speed Known

For YAMAHA Bikes

YAMAHA FZ-FI
Tyre Size: 140/60-17
Tyre Diameter: 23.6141"
Tyre Circumference: 1.885m
Tyre at 1KMPH (A): 8.8414 RPM
Primary Reduction (B): 3.4090
Final Reduction (C): 2.9285
Top Gear Ratio (D): 0.875
Tacho-Speed Ratio (ABCD): 77.2327
At 8K RPM, True Speed: 103.6KMPH

YAMAHA FZ
Tyre Size: 140/60-17
Tyre Diameter: 23.6141"
Tyre Circumference: 1.885m
Tyre at 1KMPH (A): 8.8414 RPM
Primary Reduction (B): 3.4090
Final Reduction (C): 2.857
Top Gear Ratio (D): 0.875
TS Ratio (ABCD): 75.347
At 8K RPM, True Speed: 106.1KMPH

YAMAHA YZF-R15
Tyre Size: 130/70-17
Tyre Diameter: 24.1653"
Tyre Circumference: 1.929m
Tyre at 1KMPH (A): 8.64 RPM
Primary Reduction (B): 3.042
Final Reduction (C): 3.133
Top Gear Ratio (D): 0.84
TS Ratio (ABCD): 69.17
At 10K RPM,True Speed:144.5KMPH

YAMAHA SZ
Tyre Size: 100/90-17
Tyre Diameter: 24.0866"
Tyre Circumference: 1.9228m
Tyre at 1KMPH (A): 8.668 RPM
Primary Reduction (B): 3.4090
Final Reduction (C): 3.0
Top Gear Ratio (D): 0.916
TS Ratio (ABCD): 81.2
At 8K RPM, True Speed: 98.52KMPH

YAMAHA SS125
Tyre Size: 3.00-18 Metric:90/90-18
Tyre Diameter: 24.378"
Tyre Circumference: 1.946m
Tyre at 1KMPH (A): 8.5646 RPM
Primary Reduction (B): 3.400
Final Reduction (C): 3.214
Top Gear Ratio (D): 0.875
TS Ratio (ABCD): 81.9
At 8K RPM, True Speed: 97.68KMPH

YAMAHA YBR 125
Tyre Size: 3.00-18 Metric:90/90-18
Tyre Diameter: 24.378"
Tyre Circumference: 1.946m
Tyre at 1KMPH (A): 8.5646 RPM
Primary Reduction (B): 3.400
Final Reduction (C): 3.214
Top Gear Ratio (D): 0.875
TS Ratio (ABCD): 81.9
At 8K RPM, True Speed: 97.68KMPH

YAMAHA YBR 110
Tyre Size: 3.00-18 Metric:90/90-18
Tyre Diameter: 24.378"
Tyre Circumference: 1.946m
Tyre at 1KMPH (A): 8.5646 RPM
Primary Reduction (B): 3.722
Final Reduction (C): 3.214
Top Gear Ratio (D): 0.875
TS Ratio (ABCD): 89.6473
At 8K RPM, True Speed: 89.23KMPH

YAMAHA CRUX
Tyre Size: 2.75-18 Metric:80/90-18
Tyre Diameter: 23.67"
Tyre Circumference: 1.89m
Tyre at 1KMPH (A): 8.8183 RPM
Primary Reduction (B): 3.722
Final Reduction (C): 3.143
Top Gear Ratio (D): 0.875
TS Ratio (ABCD): 90.26
At 8K RPM, True Speed: 88.63KMPH

YAMAHA YZF-R25
Tyre Size: 140/70-17
Tyre Diameter: 24.7165"
Tyre Circumference: 1.973m
Tyre at 1KMPH (A): 8.4474 RPM
Primary Reduction (B): 3.0434
Final Reduction (C): 3.0714
Top Gear Ratio (D): 0.92
TS Ratio (ABCD): 72.645
At 12K RPM,True Speed: 165 KMPH

Re: Calculations for the Engine RPM with the Vehicle speed Known

For KTM Bikes

KTM DUKE 200
Tyre Size: 150/60-17
Tyre Diameter: 24.0866"
Tyre Circumference: 1.9228m
Tyre at 1KMPH (A): 8.668 RPM
Primary Reduction (B): 3.2727
Final Reduction (C): 3.0
Top Gear Ratio (D): 0.91667
Tacho-Speed Ratio (ABCD): 78
At 10K RPM,True Speed:128.2KMPH

KTM DUKE 390
Tyre Size: 150/60-17
Tyre Diameter: 24.0866"
Tyre Circumference: 1.9228m
Tyre at 1KMPH (A): 8.668 RPM
Primary Reduction (B): 2.6667
Final Reduction (C): 3.0
Top Gear Ratio (D): 0.84
TS Ratio (ABCD): 58.25
At 10K RPM,True Speed:171.3KMPH

Re: Calculations for the Engine RPM with the Vehicle speed Known

For HONDA Bikes

HONDA CBR 150
Tyre Size: 130/70-17
Tyre Diameter: 24.1653"
Tyre Circumference: 1.929m
Tyre at 1KMPH (A): 8.64 RPM
Primary Reduction (B): 3.260
Final Reduction (C): 2.866
Top Gear Ratio (D): 0.923
Tacho-Speed Ratio (ABCD): 74.50
At 10K RPM,True Speed:134.2KMPH

HONDA CBR 250
Tyre Size: 140/70-17
Tyre Diameter: 24.7165"
Tyre Circumference: 1.973m
Tyre at 1KMPH (A): 8.4474 RPM
Primary Reduction (B): 2.808
Final Reduction (C): 2.714
Top Gear Ratio (D): 0.963
TS Ratio (ABCD): 62
At 9K RPM,True Speed:145.1KMPH

HONDA CB UNICORN
Tyre Size: 100/90-18
Tyre Diameter: 25.0866"
Tyre Circumference: 2.002m
Tyre at 1KMPH (A): 8.325 RPM
Primary Reduction (B): 3.3500
Final Reduction (C): 3.0714
Top Gear Ratio (D): 0.9375
TS Ratio (ABCD): 80.3041
At 8K RPM,True Speed:99.6KMPH

Re: Calculations for the Engine RPM with the Vehicle speed Known

I need the multiplier constant for Hero[Honda] Splendor +

I only have gear ratios of Splendor+ :

1 35/17 = 2.059
2 29/17 = 1.706
3 26/21 = 1.238
4 23/24 = 0.9583

Re: Calculations for the Engine RPM with the Vehicle speed Known

Sir, I shall soon update every thing. Please PM other details if you have. And the tyre size

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Re: Calculations for the Engine RPM with the Vehicle speed Known

And what can be a better name for speed constant? Multiplier? Please suggest.

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Re: Calculations for the Engine RPM with the Vehicle speed Known

Tacho/speed ratio would be easily understandable....

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Re: Calculations for the Engine RPM with the Vehicle speed Known

FOR HERO/ HERO HONDA BIKES

HERO HONDA KARIZMA R/ZMR V1
Tyre Size: 100/90-18
Tyre Diameter: 25.0866"
Tyre Circumference: 2.002m
Tyre at 1KMPH (A): 8.3250 RPM
Primary Reduction (B): 3.0909
Final Reduction (C): 3.0769
Top Gear Ratio (D): 0.815
Tacho-Speed Ratio (ABCD): 64.52
At 8K RPM,True Speed:124 KMPH

HERO IMPULSE
Tyre Size: 110/90-17
Tyre Diameter: 24.7952"
Tyre Circumference: 1.979m
Tyre at 1KMPH (A): 8.4217 RPM
Primary Reduction (B): 3.3500
Final Reduction (C): 2.9411
Top Gear Ratio (D): 0.9375
Tacho-Speed Ratio (ABCD): 77.8
At 8K RPM,True Speed:102.8 KMPH

HERO HONDA PASSION PRO 2009
Tyre Size: 3.00-18 Metric:90/90-18
Tyre Diameter: 24.378"
Tyre Circumference: 1.946m
Tyre at 1KMPH (A): 8.5646 RPM
Primary Reduction (B): 3.722
Final Reduction (C): 3.143
Top Gear Ratio (D): 0.958
TS Ratio (ABCD): 95.98
At 8K RPM,True Speed:83.3 KMPH

HERO ACHIEVER
Tyre Size: 3.00-18 Metric: 90/90
Tyre Diameter: 24.378"
Tyre Circumference: 1.946m
Tyre at 1KMPH (A): 8.5646 RPM
Primary Reduction (B): 3.3500
Final Reduction (C): 2.800
Top Gear Ratio (D): 0.9375
TS Ratio (ABCD):75.31
At 8K RPM, True Speed:106.2 KMPH

HERO GLAMOUR CARB/FI
Tyre Size: 3.00-18 Metric: 90/90
Tyre Diameter: 24.378"
Tyre Circumference: 1.946m
Tyre at 1KMPH (A): 8.5646RPM
Primary Reduction (B): 3.3500
Final Reduction (C): 3.0714
Top Gear Ratio (D): 0.913
TS Ratio (ABCD): 80.45
At 8K RPM, True Speed:99.4 KMPH

HERO HF DAWN,HF DELUXE
Tyre Size: 2.75-18 Metric: 80/90
Tyre Diameter:23.67 "
Tyre Circumference: 1.89m
Tyre at 1KMPH (A): 8.818 RPM
Primary Reduction (B): 3.722
Final Reduction (C): 3.0714
Top Gear Ratio (D): 0.958
TS Ratio (ABCD): 96.57
At 8K RPM, True Speed:82.8 KMPH

HERO HUNK/XTREME
Tyre Size: 100/90-18
Tyre Diameter: 25.0866"
Tyre Circumference: 2.002m
Tyre at 1KMPH (A): 8.325 RPM
Primary Reduction (B): 3.3500
Final Reduction (C): 3.0714
Top Gear Ratio (D): 0.9375
TS Ratio (ABCD): 80.3
At 9K RPM, True Speed:112 KMPH

HERO IGNITOR
Tyre Size: 80/100-17
Tyre Diameter: 23.3"
Tyre Circumference: 1.86m
Tyre at 1KMPH (A):8.96 RPM
Primary Reduction (B): 3.3500
Final Reduction (C): 3.0714
Top Gear Ratio (D): 1.038
TS Ratio (ABCD): 95.69
At 8K RPM, True Speed:83.6 KMPH

Any Wrong Info, please PM me

Re: Calculations for the Engine RPM with the Vehicle speed Known

FOR BAJAJ BIKES

BAJAJ PULSAR 220F
Tyre Size: 120/80-17
Tyre Diameter: 24.56"
Tyre Circumference: 1.96m
Tyre at 1KMPH (A): 8.5034 RPM
Primary Reduction (B): 3.4736
Final Reduction (C): 2.5714
Top Gear Ratio (D): 0.8888
Tacho-Speed Ratio (ABCD): 67.5
At 9K RPM,True Speed: 133.3KMPH

BAJAJ PULSAR 180 UG4+
Tyre Size: 120/80-17
Tyre Diameter: 24.56"
Tyre Circumference: 1.96m
Tyre at 1KMPH (A): 8.5034 RPM
Primary Reduction (B): 3.4736
Final Reduction (C): 2.7857
Top Gear Ratio (D): 0.92
Tacho-Speed Ratio (ABCD): 75.7
At 9K RPM,True Speed: 118.9KMPH

BAJAJ PULSAR 150 UG4+
( not confirmed, PM corrections if any)
Tyre Size: 100/90-17
Tyre Diameter: 24.0866"
Tyre Circumference: 1.922m
Tyre at 1KMPH (A): 8.6715 RPM
Primary Reduction (B): 3.4736
Final Reduction (C): 2.9333
Top Gear Ratio (D): 0.92
Tacho-Speed Ratio (ABCD): 81.27
At 9K RPM,True Speed: 110 KMPH

BAJAJ PULSAR 200 NS
Tyre Size: 130/70-17
Tyre Diameter: 24.1653"
Tyre Circumference: 1.929m
Tyre at 1KMPH (A): 8.64 RPM
Primary Reduction (B): 3.272
Final Reduction (C): 2.6
Top Gear Ratio (D): 0.9166
TS Ratio (ABCD): 67.37
At 9K RPM, True Speed: 133.6KMPH

BAJAJ XCD 125 DTS-Si
Tyre Size: 3.00-17 Metric:90/90-17
Tyre Diameter: 23.378"
Tyre Circumference: 1.866m
Tyre at 1KMPH (A): 8.9317 RPM
Primary Reduction (B): 3.4736
Final Reduction (C): 2.8
Top Gear Ratio (D): 0.9583
TS Ratio (ABCD): 83.24
At 8K RPM, True Speed: 96.1KMPH

BAJAJ DISCOVER 150
Tyre Size: 100/90-17
Tyre Diameter: 24.0866"
Tyre Circumference: 1.922m
Tyre at 1KMPH (A): 8.6715 RPM
Primary Reduction (B): 3.571
Final Reduction (C): 3.071
Top Gear Ratio (D): 0.909
TS Ratio (ABCD): 86.443
At 8K RPM, True Speed:92.5 KMPH

Re: Calculations for the Engine RPM with the Vehicle speed Known

FOR ROYAL ENFIELD's

RE BULLET STD 350, ELECTRA
Tyre Size: 3.25-19 Metric: 100/90
Tyre Diameter: 26.0866"
Tyre Circumference: 2.082m
Tyre at 1KMPH (A): 8.005RPM
Primary Reduction (B): 2.15
Final Reduction (C): 2.533
Top Gear Ratio (D): 1
TS Ratio (ABCD): 43.5948
At 4K RPM, True Speed: 91.5 KMPH

RE CLASSIC 350
Tyre Size: 110/90-18
Tyre Diameter: 25.7952"
Tyre Circumference: 2.059m
Tyre at 1KMPH (A): 8.094 RPM
Primary Reduction (B): 2.15
Final Reduction (C): 2.375
Top Gear Ratio (D): 1.00
TS Ratio (ABCD): 41.33
At 4K RPM, True Speed: 96.7 KMPH

RE THUNDERBIRD 350
Tyre Size: 120/80-18
Tyre Diameter: 25.559"
Tyre Circumference: 2.04m
Tyre at 1KMPH (A): 8.17 RPM
Primary Reduction (B): 2.15
Final Reduction (C): 2.375
Top Gear Ratio (D): 1.00
TS Ratio (ABCD): 41.718
At 4K RPM, True Speed: 95.8 KMPH

RE THUNDERBIRD 500
Tyre Size: 120/80-18
Tyre Diameter: 25.559"
Tyre Circumference: 2.04m
Tyre at 1KMPH (A): 8.17 RPM
Primary Reduction (B): 2.15
Final Reduction (C): 2.11
Top Gear Ratio (D): 1.00
TS Ratio (ABCD): 37.06
At 4K RPM, True Speed:107.9 KMPH

RE BULLET 500 CARB, CLASSIC-FI
Tyre Size: 120/80-18
Tyre Diameter: 25.559"
Tyre Circumference: 2.04m
Tyre at 1KMPH (A): 8.17 RPM
Primary Reduction (B): 2.15
Final Reduction (C): 2.11
Top Gear Ratio (D): 1.00
TS Ratio (ABCD): 37.06
At 4K RPM, True Speed:107.9 KMPH

RE CONTINENTAL GT 535
Tyre Size: 130/70-18
Tyre Diameter: 25.1653"
Tyre Circumference: 2.008m
Tyre at 1KMPH (A): 8.3 RPM
Primary Reduction (B): 2.15
Final Reduction (C): 2.00
Top Gear Ratio (D): 1.00
TS Ratio (ABCD): 35.69
At 4K RPM, True Speed: 112 KMPH

Re: Calculations for the Engine RPM with the Vehicle speed Known

FOR TVS BIKES,

TVS APACHE 180 RTR
Tyre Size: 110/80-17
Tyre Diameter: 23.9291"
Tyre Circumference: 1.91m
Tyre at 1KMPH (A): 8.726 RPM
Primary Reduction (B): 3.0952
Final Reduction (C): 3.1428
Top Gear Ratio (D): 0.88
TS Ratio (ABCD): 74.69
At9K RPM, True Speed: 120.5 KMPH

TVS APACHE 160 RTR
Tyre Size: 110/80-17
Tyre Diameter: 23.9291"
Tyre Circumference: 1.91m
Tyre at 1KMPH (A): 8.726 RPM
Primary Reduction (B): 3.0952
Final Reduction (C): 3.3846
Top Gear Ratio (D): 0.88
TS Ratio (ABCD): 80.44
At 9K RPM, True Speed: 111.8KMPH

TVS APACHE 150
Tyre Size: 100/80-18
Tyre Diameter: 24.3"
Tyre Circumference: 1.939m
Tyre at 1KMPH (A): 8.595 RPM
Primary Reduction (B): 3.0952
Final Reduction (C): 3.3846
Top Gear Ratio (D): 0.88
TS Ratio (ABCD): 79.24
At9K RPM, True Speed: 113.5 KMPH

TVS SPORT DURALIFE
Tyre Size: 3.00-17 Metric: 90/90
Tyre Diameter: 23.378"
Tyre Circumference: 1.866m
Tyre at 1KMPH (A): 8.93178 RPM
Primary Reduction (B): 3.722
Final Reduction (C): 3.076
Top Gear Ratio (D): 0.958
TS Ratio (ABCD): 97.96
At 8K RPM, True Speed:81.6 KMPH

TVS STAR CITY 110
Tyre Size: 3.00-17 Metric: 90/90
Tyre Diameter: 23.378"
Tyre Circumference: 1.866m
Tyre at 1KMPH (A):8.93178 RPM
Primary Reduction (B): 3.722
Final Reduction (C): 2.929
Top Gear Ratio (D): 0.958
TS Ratio (ABCD): 93.28
At 8K RPM, True Speed:85.76 KMPH

Re: Calculations for the Engine RPM with the Vehicle speed Known

FOR SUZUKI BIKES,

SUZUKI GS 150R
Tyre Size: 100/90-18
Tyre Diameter: 25.0866"
Tyre Circumference: 2.002m
Tyre at 1KMPH (A): 8.325 RPM
Primary Reduction (B): 3.4761
Final Reduction (C): 2.9285
Top Gear Ratio (D): 0.8333
TS Ratio (ABCD): 70.62
At 8K RPM,True Speed: 113.2 KMPH

SUZUKI GIXXER
Tyre Size: 140/60-17
Tyre Diameter: 23.6141"
Tyre Circumference: 1.885m
Tyre at 1KMPH (A): 8.8417 RPM
Primary Reduction (B): 3.181
Final Reduction (C): 3.00
Top Gear Ratio (D): 0.875
TS Ratio (ABCD): 73.83
At 8K RPM, True Speed: 108.3KMPH

SUZUKI INAZUMA GW250
Tyre Size: 140/70-17
Tyre Diameter: 24.7165"
Tyre Circumference:1.973m
Tyre at 1KMPH (A): 8.4474 RPM
Primary Reduction (B): 3.238
Final Reduction (C): 3.2857
Top Gear Ratio (D): 0.808
TS Ratio (ABCD): 72.6171
At 8.5K RPM,True Speed: 117 KMPH

ANY MISSING DATA WILL BE UPDATED SOON

Re: Calculations for the Engine RPM with the Vehicle speed Known

FOR KAWASAKI BIKES,

KAWASAKI NINJA 250
Tyre Size: 130/70-17
Tyre Diameter: 24.1653"
Tyre Circumference: 1.929m
Tyre at 1KMPH (A): 8.64 RPM
Primary Reduction (B): 3.087
Final Reduction (C): 3.0714
Top Gear Ratio (D): 0.8928
TS Ratio (ABCD): 73.137
At 11K RPM, True Speed: 150 KMPH

KAWASAKI NINJA 300
Tyre Size: 140/70-17
Tyre Diameter: 24.7165"
Tyre Circumference: 1.973m
Tyre at 1KMPH (A): 8.4474 RPM
Primary Reduction (B): 3.087
Final Reduction (C): 3.00
Top Gear Ratio (D): 0.85714
TS Ratio (ABCD): 67.055
At 11K RPM, True Speed: 164 KMPH

KAWASAKI NINJA 650
Tyre Size: 160/60-17
Tyre Diameter: 24.56"
Tyre Circumference: 1.96m
Tyre at 1KMPH (A): 8.5034 RPM
Primary Reduction (B): 2.095
Final Reduction (C): 3.06667
Top Gear Ratio (D): 0.85185
TS Ratio (ABCD): 46.538
At 8.5K RPM, True Speed: 182KMPH


ANY MISSING DATA WILL BE UPDATED SOON

Re: Calculations for the Engine RPM with the Vehicle speed Known

TS RATIO ( Tacho/ Speed Ratio)

What is TS Ratio?
TS Ratio is the Ratio between the Engine RPM to Vehicle speed at any given time.
The ratios calculated holds good only at the top gear of the vehicle without any changes in the stock condition.


Advantages of TS Ratio:

1. Bikes without Tachometer have a greater advantage. Example: 100cc Hero splendor, Bajaj Platina, Chethak, RX100, Bullet etc

2. Mechanical Damage of clutch can be found. In case there is less friction between the clutch plates,and the engine rotates but wheels donot rotate up to mark. However compression leakage cannot be found.

3. The most useful. Before purchasing any bike, it is possible to estimate at what speed the bike will be at the Red line (10000 RPM+). Example: Duke 390 will go to a max of 171.3 kmph at 10000 RPM.

4. True speed of the vehicle can be known. Digital Displays always shows a value which is 1-5% greater than the actual value. Example: My Pulsar 180 displays 100 kmph, but the GPS indicates a max of 95 kmph which holds good with the TS Ratio.

5. While checking for the top speed of the bike, it is enough if we record the maximum possible RPM. So, by Dividing the TS Ratio with the RPM gives true speed. Example: At 9500 RPM pulsar 180 will be at 125 kmph.

Re: Calculations for the Engine RPM with the Vehicle speed Known

What about pulsar 200ns

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