staggs65
Moderator
i've seen people posting the drive ratios for different gears/drivers, could someone give me the formula for this
thanks
jeff
thanks
jeff
To get the gear ratio you divide the bottom by the top to get the ratio ex 40/21= 1.90. the stock gear ratio for 00 SRX 700 is 38/23 or 1.65
there is this one from the Aaen's clutch tuning guide
Engine speed x sprocket pitch diameter
Gearing= _________________________________
Shift ratio x MPH x 336
there is this one from the Aaen's clutch tuning guide
Engine speed x sprocket pitch diameter
Gearing= _________________________________
Shift ratio x MPH x 336
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kirk700 srx
Member
needaSRX said:
How would you get the gear ratio of 40/21 with an 8 tooth driver instead of a stock 9 tooth driver? I was told it was 2.05! If you divide top gear into bottom gear it is only 1.905! What do you have to multiply 1.905 by to get 2.05? I was never very good at math lol !
staggs65
Moderator
yeah that's more what i'm looking for as well
Hi:
The normal gear ratio formula is based on a 9 tooth 2.52" driver.
To correct for 8 or 7 tooth 2.52 drivers you must divide the final ratio by 9 then multiply by the new tooth[2.52] driver.
IE: top gear : = 23
bottom gear: = 38
38 dived by 23 = 1.65: for 9 tooth drivers[normal]
Therefore if you switch to 8 tooth 2.52" drivers
1.65 X 9 divided by 8 = 1.86:1 final ratio
Make sense?
The normal gear ratio formula is based on a 9 tooth 2.52" driver.
To correct for 8 or 7 tooth 2.52 drivers you must divide the final ratio by 9 then multiply by the new tooth[2.52] driver.
IE: top gear : = 23
bottom gear: = 38
38 dived by 23 = 1.65: for 9 tooth drivers[normal]
Therefore if you switch to 8 tooth 2.52" drivers
1.65 X 9 divided by 8 = 1.86:1 final ratio
Make sense?
Last edited:
valin
Active member
Here.
MPH = (RPM/Gear Ratio) x (Driver Circumference/12) x (60/5280)
Gear Ratio is calculated by dividing the bottom sprocket by the top sprocket in teeth.
Driver Circumferences:
7 tooth = 17.64
8 tooth = 20.16
9 tooth = 22.68
10 tooth = 25.24
MPH = (RPM/Gear Ratio) x (Driver Circumference/12) x (60/5280)
Gear Ratio is calculated by dividing the bottom sprocket by the top sprocket in teeth.
Driver Circumferences:
7 tooth = 17.64
8 tooth = 20.16
9 tooth = 22.68
10 tooth = 25.24
kirk700 srx said:
40 divided by 21 = 1.90:1
1.90 X 9 divided by 8 = 2.14:1 final ratio
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when going from 9's to 8's I always divide the top into the bottom and then multiply by 1.13. Some say 1.12. It's actually somewhere in between, but it's close enough either way 99.8% of the time.
kirk700 srx
Member
kirk700 srx said:
I was told for a 22/40 gear ratio ...It all makes sense now! 22 divide into 40 x 9 divide by 8 =2.045 to 1 Thanks for clearin that up for me !
staggs65
Moderator
thanks guys thats what i was looking for
bravo-guy
New member
Is it better to have gearing below or above 2 if you want to play alot with hard acceleration, I trail ride to get to the riding areas (about 50/50).
So theoretically my ratio should be 2.43:1
(18t top, 39 bottom, 8 tooth drivers) Is that what came stock on the 01 Mtn lite, 8 tooth drivers? Thats what I'm assuming.
So theoretically my ratio should be 2.43:1
(18t top, 39 bottom, 8 tooth drivers) Is that what came stock on the 01 Mtn lite, 8 tooth drivers? Thats what I'm assuming.
One question I have is how track height affect gearing.
Like going to 8t drivers but a 1.5" or 1.75" track from the stock what ~1" tracK?
If going to a taller lug height track is a gearing change necessary?
Like going to 8t drivers but a 1.5" or 1.75" track from the stock what ~1" tracK?
If going to a taller lug height track is a gearing change necessary?
WNYViper
New member
Track height shouldnt play a factor in drive because the drivers are just driving an endless belt... its basically like your car tires are the driver and the road is the track.
kirk700 srx
Member
You should lower your gearing if you use a bigger lug track, if gearing is too low when you change the gearing and your over reving add some weight to your primary weights on tip! I could be wrong on this I am just learnin myself
WNYViper said:
Ah that makes sense thank you for putting it in laymans terms!
kirk700 srx
Member
klrgreenis said:
Well If you are goin from 9 tooth drive to 8 tooth drive with gearing 18/39
Stock would be 2.16.1
With 8 tooth drivers will be 1.93.1
top/bottomx8/9=1.93.1
18/39 with 9's is 2.16 which is pretty steep
18/29 with 8's is 2.44 which is almost like a tractor
18/29 with 8's is 2.44 which is almost like a tractor