Gearing Change with rim size change Questions

  • kzcafe750_24
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31 Jan 2012 01:56 #501034 by kzcafe750_24
Gearing Change with rim size change Questions was created by kzcafe750_24
Hey guys,
Have 81 kz 750-4 stock gearing(13/32-630 chain). I'm going to to change the the sprocket and chain to a 530(16/39) and swapping the stock 16in rim with a 18in rim; and I am just wonder how changing the rim size will affect my gearing for stock? Any info would be great.

Thanks,
Dylon




I am planning to put a 530 chain on with a 17 tooth front and 44 tooth rear sprocket.

1981 Kz 750-4 LTD - Wiseco 810 Big Bore,Ported cylinder head, GPZ 750 Cams,Dyna Ignition(DynaS,Green Coils,DRL400 2stage Revlimiter), RC 4 into 1 fitted with Yoshi muffler, ZR550 Swing arm, ZR550 Rear Rim, ZX750turbo front end SuperFlo Dyno Tuned- 68WHP&43WTq(ftlbs)
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1985...

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31 Jan 2012 02:02 - 31 Jan 2012 02:36 #501035 by Patton

kzcafe750_24 wrote: ... swapping the stock 16in rim with a 18in rim; and I am just wonder how changing the rim size will affect my gearing for stock?....

If tires have equal outside diameters, the gear ratio won't change due to difference in wheel diameters.




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31 Jan 2012 02:03 #501036 by ramtough_63
Replied by ramtough_63 on topic Gearing Change with rim size change Questions
depending on the height of the tire. there is a calculation for tire sizt that will give you the overall hetgth with your 16 inch rim then useth the calculation for the 18 inch rim to see which tire is actually 2" shorter I cant remember the exact calculation

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31 Jan 2012 02:24 #501037 by ramtough_63
Replied by ramtough_63 on topic Gearing Change with rim size change Questions
here is the calculation

Tire size lets say 130
times the aspect ratio
lats say .90
130X.90= 117
devided by 25.4 (metric conversion)
=4.6 inches
plus your current rim 16
=20.6 is you current tire height

130X.90/25.4+16=20.6
130X.55=71.5/25.4=2.81+18=20.8

you can use this with any width as long as they make a tire to keep you heght the same

1978 KZ1000 A2
Thrown Together To Ride Til Winter
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1982/83 750R/GPZ
1984 Goldwing 1200 Interstate
1982 Yamahopper QT50
Previous
2 79 HD sporty XLH
02 HD FLSTS Heritage
60's HD Hummer
70's Honda 550 Four
70 Yamaha 100
and various enduros dirtbikes minibikes...

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31 Jan 2012 10:06 #501062 by 650ed
The stock gearing on the 1981 KZ750 E2 (which came standard with an 18" rear wheel running a 400H-18 tire) is 13/33. That's not much different than what you have today; probably because of the rear tire diameters being pretty close. Ed

1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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  • testarossa
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31 Jan 2012 13:42 #501087 by testarossa
Replied by testarossa on topic Gearing Change with rim size change Questions
Use this website: www.gearingcommander.com/

You can plug in different tire sizes, and gear combinations. It will tell you more information than you want to know about rpms per given speed, chain wear calculations, etc.

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