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zx 12r gear ratio's
Posted: Thu Apr 13, 2006 11:32 pm
by ZZRCHIKKY
Gear Ratios:
1st 2.429 (34/14)
2nd 1.824 (31/17)
3rd 1.440 (36/25)
4th 1.250 (30/24)
5th 1.130 (26/23)
6th 1.033 (31/30)
why isnt there a 1.000 ratio ???
Posted: Fri Apr 14, 2006 12:18 am
by Felix
What's 6th? 1.033??
I think you'll find that they never make a 1:1 exactly 1:1. Maybe one of the engineering types could explain it better, but I think it has something to do with the wear of the gears - you always want a slight bit of difference.
Posted: Fri Apr 14, 2006 8:21 am
by SocialSecurity
most bikes rarely go as low as or below 1:1 even in top?
Posted: Fri Apr 14, 2006 8:52 am
by ZZRCHIKKY
and ona bike lol what is it engin turn to what?
front sproket ???
Posted: Fri Apr 14, 2006 9:51 am
by SocialSecurity
yeah
then you have the final drive ratio, which is determined by the front and rear sprockets
Posted: Fri Apr 14, 2006 6:32 pm
by Smitty
SocialSecurity wrote:yeah
then you have the final drive ratio, which is determined by the front and rear sprockets
the book sez 18/46 which = 2.556
hth
Re: zx 12r gear ratio's
Posted: Fri Apr 14, 2006 6:32 pm
by Gosling1
ZZRCHIKKY wrote:Gear Ratios:
1st 2.429 (34/14)
2nd 1.824 (31/17)
3rd 1.440 (36/25)
4th 1.250 (30/24)
5th 1.130 (26/23)
6th 1.033 (31/30)
why isnt there a 1.000 ratio ???
these are just the internal ratios of the gearbox......basically the input/output shaft ratios.......the 'final drive' ratio (often referred to as 'final reduction ratio') is the ratio between front sprocket and rear sprocket.
You also have a 'Primary reduction ration' which is the ratio between the gear teeth on the crankshaft, that drive the clutch basket (it has a ring gear around the circumference).
1.000 ratio on the top gear (usually 5th or 6th gear) is about as close to 1.033 as fuck is to swearing......that is about as technical as I can be at the moment......
Posted: Fri Apr 14, 2006 6:54 pm
by ZZRCHIKKY
thank you very much
i actually understood all of that lol
Posted: Fri Apr 14, 2006 9:01 pm
by Smitty
ZZRCHIKKY wrote:thank you very much
i actually understood all of that lol
now
go out and buy a ZX-12r.....
Posted: Fri Apr 14, 2006 9:07 pm
by Neka79
ZZRCHIKKY wrote:thank you very much
i actually understood all of that lol
the only bit i understood was "blah blah blah neka is a champion blah blah"
Posted: Fri Apr 14, 2006 9:21 pm
by ZZRCHIKKY
Smitty wrote:ZZRCHIKKY wrote:thank you very much
i actually understood all of that lol
now
go out and buy a ZX-12r.....
i think that would be a bit to big of a step from a zzr 250 lol
Posted: Fri Apr 14, 2006 11:04 pm
by Gosling1
ZZRCHIKKY wrote:...i think that would be a bit to big of a step from a zzr 250 lol
well, it wouldn't be the first time that someone has done that jump......
Felix was spot-on about the need to have a slight variation in the top-gear ratio. If it was 1.000 (say, for example 30/30 in top gear, instead of 30/31), then what would occur is the gears would always be meshing with the same teeth - over time, this could result in severe wear if there was even the 'tiniest' bit of misalignement with the gears meshing.
When there is a difference with the gears (like 30/31), then the gears are not always meshing with exactly the same teeth on every revolution. This prevents any premature wear of the gear teeth. In a nutshell, thats the reason why your 'top-gear' ratio will never be 1:1.