Calculate MPH from RPMs

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HD 2007/08 Performance Recommendations

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	Harley Camshaft Specification Tables
HD Twin Cam Engine Builds TC 128 HP 95 CID TC 100HP Street Engine	The basics of Fuel Injection explained
DEWEY'S CUSTOM Rammer Performance Air Cleaners TC Performance Heads 100+HP	Pro Tuning on a Shade Tree Budget

MPH versus RPM Calculator

Tire Size

Section Width:	mm
Aspect Ratio:	%
Wheel Diameter:	in
Use:	Calculated	Actual
Diameter:	* in	in
Circumference:	* in	in
Revolutions/Mile:	*

* calculated from tire size--do not change

Gear Ratios

Overall Drive Ratio	:1
1st	:1
2nd	:1
3rd	:1
4th	:1
5th	:1
6th	:1

Overall Drive Ratio can be computed at Calculate Gear Ratios page

Speedometer Gear

Speedo Revolutions/Mile:
Drive Gear Teeth:
Driven Gear Teeth:

MPH/RPM Range

Calculate:	MPH	RPM
Lower Bound:	RPM	MPH
Upper Bound:	RPM	MPH
Increment:	RPM	MPH

The reset values displayed are from a 1994 FXDL Harley-Davidson Dyna Low Rider. All late model Harley Big Twin models have similar. The Rear Wheel Sprocket can vary, with belt drive models using a 61, 65 or 70 tooth sprocket. Below is a table of typical values for late model Harley-Davidson motorcycles.

Make Model	Engine Sprocket	Clutch Sprocket	Trans Sprocket	Rear Wheel Sprocket	Final Drive Ratio	1st Gear	2nd Gear	3rd Gear	4th Gear	5th Gear
HD FXDL Domestic	24	37	32	70	3.37	3.24	2.21	1.60	1.23	1.00
HD FXDL Export	24	37	32	65		3.24	2.21	1.60	1.23	1.00
HD FXDL Australia	24	37	32	61		3.24	2.21	1.60	1.23	1.00
HD EVO 883 Sportster	35	56	27	61		4.30	3.15	2.29	1.88	1.00
HD EVO 1200 Sportster	35	56	29	61		4.30	3.15	2.29	1.88	1.00

� 1998 John A Bolton.
All Rights Reserved.

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Modification, Installation, Maintenance and Tuning Index will help you find most of the information you want on one page.

How to get Professional Tuning Results at home
Testing the Innovate Motorsport LM-1 portable air fuel meter

Profession Tuning on a Shade Tree Budget

Veypor VR2 Data Logger and Instrument Panel
Video Installation and Demo
Purchase VR2

Engine Performance
How to Build a
TC96 2007 Engines
TC88 70HP Stage1
TC95 128HP Stage 3
TC95 100HP Street
TC96 2007 Stage 1/2
EVO 64 HP Stage 1
EVO 74 HP Stage 2
EVO 82 HP Stage 3
EVO 95 HP Stage 3
883 to 1200 Upgrade
Shovelhead Modifications

New EFI for EVO and TC

Performance Gallery
Horsepower Gallery
Evolution 80
Shovelhead
Sportster
Twin Cam 88/95
Evolution Unlimited
Sportster Unlimited
Drag Strip Gallery
Land Speed Racing Gallery
CV Carburetor
Modifying the CV carb
Tuning a CV carb
Camshafts
Selecting a cam
Install a TC 88/95 cam
Install a Big Twin cam
Install Sportster cams

Camshaft Specifications
Twin Cam
EVO
Shovel
XL

Exhaust Systems
EVO Exhaust Testing
TC Exhaust Testing
Khrome Werks AR100 test
Making Drag Pipes Work

SHOP TALK
Shop Manual
Carburetor
Carburetor Troubleshooting
Exhaust
Ignition
Finding Manifold Leaks
Camshafts
Cylinder Heads
Pistons and Cylinders
Clutch
Belt Drive
Shop Manual Appendix
$20 Bike Lift
Plug Wires
Spark Plugs
Engine Tuning
Nitrous Oxide
Motor Oil
Stutter Box
General Information
WEB Links
Buy Books and Manuals
Miscellaneous
Performance Calculations
Estimate Horsepower
Estimate 1/4 Mile Time
Estimate Top Speed
Engine Displacement
Exhaust Length
Gear Ratios
MPH at RPM
Air Density

The Nightrider Diaries
The ramblings of a genius a, a madman and something in between.

Where is Sifton Cams?

Autocom Active-7 tested

Harley-Davidson EFI
-EFI basics explained
-EFI modifications explained

183 HP, 2 carbs, 2680cc