hi all....

looking at a recent post, this is something i have overlooked....

however i have a no way of using the sticied thread as i dont have a programme at work that can open it and im not allowed to download one so can anyone help??

i have a 3.18 rear diff (i think, or it might be 3.8) mating up with a fireblade engine...

cheers

barry

I can email you one?

There is a good on line calc that doesnt need downloading at www.gearingcommander.com, although aimed at bikes it is really useful for becs and has all the ratios of all the models preset once you input make and model.
It will give final drive, rpm drops, comparative charts and much more
regards
Andy

Something like this? Bit crap but readable, tyre sizes make a differance.

Just a quick tip.

If you do try the www.gearcommander.com site, and you have a diff (i.e. not chain drive). Then in the space where you need to put the front and rear sprockets you need to put in your differential tooth ratio (i.e. 47 and 15 for a 3.14 ratio).

If you don't know these then you can

put 362 and 100 (for a 3.62 diff)
or 314 and 100 (for a 3.14 diff)

etc etc.


You also need to input your wheel circumference.

Great database of gear ratios.

I have gear calculators on my site.
There is one for using with a rear differential.
Gear Calculator
If you are using a CEC then just input a Primary reduction ratio of "1".


BEC CEC Gear Ratio Calculator
Typical output from gear calculator.
The site also has lots of gear calculators for most popular bike engines with the gear ratios already input for you.