Topic: sprocket gearing question

[heffay]

92 zx7r

going from 15 tooth front to stock 16 tooth
going from 44 tooth rear to 46 tooth

someone on here was even able to crank out percentages w/ other questions of this type... what say you?

[tbpmusic]

This little spreadsheet will do it for you.

http://home.comcast.net/~tbpmusic4/speedratio.zip

Or, these web sites do it too.

http://www.garveynetworks.co.uk/gear/index.php

http://www.jpcycles.com/Tech/Ref/TopSpeed.aspx

bill

[heffay]

thanks man!

[Gordon]

So in other words, no real change.

[heffay]

yep... just a tiny bit.
i was actually trying to go the other way with it thinking that i had a 16 on the front and that would not change.
but, since i went up in the front and down in the rear... it was not geared down but very slightly up. 
tis ok... speed is good.   

p.s.  that top speed is about 5-8 mph too low.       if there were no speedo error.   

[heffay]

i like how it has me shifting into 6th at 144mph 

"yea... i just kick it into over drive at a bit under 150 and just cruise."   

[tbpmusic]

What, you mean your bike won't do 144 mph+  ?

What kind of junk do you ride anyway ??!!  (Scoffing derisively).

 


bill

[heffay]

What, you mean your bike won't do 144 mph+  ?

What kind of junk do you ride anyway ??!!  (Scoffing derisively).

 


bill

you may have misread... it'll do it    although, i prefer to shift before 144mph 
i've seen an indicated 155mph on a barren road at about 7,000ft above sea level... yes, the bike has mods 
... piece of junk.   

here, pretend you guys haven't seen it before    ...

[tbpmusic]

i've seen an indicated 155mph on a barren road at about 7,000ft above sea level.

Yoiks !!
I was just yankin' your chain - that's WAY too fast for me, thanks.

bill

[cb650]

A 6 speed?  Dont your hand and foot get so terribly over worked with the several billion extra gear changes?

[754]

Basic gearing calculation..

 Driven = ratio
--------
 Driver

[heffay]

Basic gearing calculation..

 Driven = ratio
--------
 Driver

probably could've looked that up, but... you know.   



here, have a look...


oh, by the way... PO's idea of torque settings:

manual calls for 54 ft/lbs on rear sprocket nuts... set to about a gibillion ft/lbs requiring two busted sockets, a week-long wound having yet to heal on my bird finger!, and a rubber mallet as the enforcer.
manual calls for 75 ft/lbs on the engine sprocket nut... nut was loose on threads w/ a large washer w/ bent edges locking the nut from spinning. 

i have yet to find much of the bike put back together the way it came... funny thing is, the guy was a knowledgeable mechanic.  guess he just didn't own a torque wrench.  or, he threw it when i usually try not to... even in a maddened haze i have the presence of mind to not hurl calibrated instruments.     unless of course they are intended to measure hurling velocity.     <frat party toy?   

anyway... shop manual says nothing of this "safety washer"... aftermarket? 

[754]

Nice sprocket...