Maths to how to work out gearing

[merv]

OK if the ratios Grub has pointed you to are correct for your model (and there are zillions of 400s) your spreadsheet looks like this as attached.

There are still some variables we don't have from you or that website like true wheel and tyre size and what maximum rpm are you getting - is 16,000 it coz stock those motors do about 14,000 don't they, which you mentioned as redline, so have you warmed yours up? If it only does 14,000 enter that in the spreadsheet.

I've taken your sprocket combo as 15/40 as mentioned above and put 16,000 into the spreadsheet and guessed the other useful rpm figures. I left it as a 17 inch wheel but some VFR400s had 18 inch.

[jrandom]

useing pie you can work out...

I find that combining pie and working out tends to leave me back at square one.

[merv]

I find that combining pie and working out tends to leave me back at square one.

Is that something to do with square pies? When I was at Uni in ChCh back in the 70's there used to be these Stevenson's Famous square pies, not sure if that place is still going. Sound like they woulda suited someone kinda random eh!

[jrandom]

Is that something to do with square pies?

?

Ahem.

Sorry...

[Cajun]

http://www.gearingcommander.com/ <-- is the one i use got a bunch of build in bikes, but more american based bikes, for vfr400 isn't there, but in turn if you know the raw information you can install it and save it

blah see grub already recommended this one.