This is my version of a motorcycle gearing calculator. It is the result of recently having shoulder surgery and therefore having lots of time to sit at this damn computer. It was built taking what I thought were the best features of several free online calculators and combining them. It is probably most useful for seeing the results of changing the final drive ratio of a bike. It will work for chain, belt, and shaft driven motorcycles. Jackshafts are handled as well.
This calculator is not complete, and absolutely nothing is guaranteed. However, I believe the math is accurate. Errors may creep in from the tire calculations. For instance, if you mount a 200 tire on too narrow of a rim, the calculation to compute the tire circumference will be inaccurate, skewing the mph calculations. There are several things to do yet, see the list below. If you have a suggestion or think there is an error, please let me know at mpg at woodsware dot com.
Rob (shroom) 1/24/2009
Adding bikes to the database
NOTE: You may enter a bike, but I control the data. I reserve the right to edit or delete any of it at any time.
Do not get mad at me if I delete for instance "Bill's Honda", with no other identifying info.
This is not useful to anyone except Bill, and the bike will be deleted.
The intent here is to gather gearing data for different makes and models of bikes.
If someone else has already entered data for your make and model bike, please do not add it again.
Otherwise, feel free.
There is no need for 37 Honda Spirit 750's in the database.
The intent here is to gather gearing data for different makes and models of bikes. If someone else has already entered data for your make and model bike, please do not add it again. Otherwise, feel free. There is no need for 37 Honda Spirit 750's in the database.
To add a bike, select "Add New Bike" from the dropdown list. There are several items that must be filled in. These are indicated by * near the input boxes:
NOTE: As long as you are viewing your bike, you can resave the data as many times as you want. If you 'leave' your bike by selecting another bike to view, you will no longer be able to edit your data! PLEASE REVIEW YOUR DATA THOROUGHLY BEFORE NAVIGATING AWAY FROM YOUR BIKE. Since there are no logins on this site (yet?) you cannot edit the data for any bike except the one you JUST ENTERED. I know it may be a limitation, but at least you can add new bikes to the database, and no login is required. If you mess up and want me to edit or delete something, let me know.
If you have a problem or notice crap or objectionable data, please let me know at mpg at woodsware dot com.
Also note: There may well be bugs.... If you notice any, again, please let me know.
email: mpg at woodsware dot com