5th gear - overdrive? - Page 2

Easy Rider · 03-23-2009, 03:41 PM

Quote:

Originally Posted by alanmcorcoran

Seems like you are taking your medication again! :whistle:

I wish. :retard:

primal · 04-02-2009, 10:31 PM

I real overdrive gear is one where the engine actually turns SLOWER than the wheel. Whether the 16T sprocket actually accomplishes this or not I dunno.

Easy Rider · 04-03-2009, 10:00 AM

Quote:

Originally Posted by primal

I real overdrive gear is one where the engine actually turns SLOWER than the wheel. Whether the 16T sprocket actually accomplishes this or not I dunno.

No it doesn't. Because of a relatively large wheel and small motor, I don't think any motorcycle has a true overdrive.......except maybe a few of the land yachts.

And I think your definition needs a slight "tweek". Overdrive is when the drive shaft turns faster than the engine. The final drive ratio in the rear end determines how fast the wheel actually rotates. That makes determining "overdrive" a bit tricky for vehicles with an integrated transmission......like front wheel drive cars and motorcycles.

Water Warrior 2 · 04-03-2009, 12:53 PM

Let me try for a bit of input. The bike sprockets and chain would be in a similar category as the rear end(differential in a cage) or the transaxle in a front wheel drive cage. My cage has a 4.11 to 1.0 rear end ratio. The drive shaft turns 4.11 times for every turn of the axle. Just to muddy the waters now we go to the internal gearing of the transmission in a bike. The GZ has 5 gear ratios that we can relate to during every ride and shift. There is also another set of internal gears and their ratio. There is another gear on the shaft(along with the 5 gears)that drives a gear mounted on the output shaft that we all recognize as the front sprocket shaft. The driven gear and it's drive gear also have a ratio sometimes referred to as an internal gear ratio. All in all it is a numbers game and best left to the designers for the best compromise in power, speed and reliability of a given machine.
Now I will sit back with a coffee and try to understand what I just said. lol.

04-02-2009, 10:31 PM	#12
primal Senior Member Join Date: Jun 2008 Location: Hurricane, WV Posts: 446	Re: 5th gear - overdrive? I real overdrive gear is one where the engine actually turns SLOWER than the wheel. Whether the 16T sprocket actually accomplishes this or not I dunno.
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04-03-2009, 12:53 PM	#14
Water Warrior 2 Senior Member Join Date: Dec 2006 Location: Squamish B.C Canada Posts: 11,409	Re: 5th gear - overdrive? Let me try for a bit of input. The bike sprockets and chain would be in a similar category as the rear end(differential in a cage) or the transaxle in a front wheel drive cage. My cage has a 4.11 to 1.0 rear end ratio. The drive shaft turns 4.11 times for every turn of the axle. Just to muddy the waters now we go to the internal gearing of the transmission in a bike. The GZ has 5 gear ratios that we can relate to during every ride and shift. There is also another set of internal gears and their ratio. There is another gear on the shaft(along with the 5 gears)that drives a gear mounted on the output shaft that we all recognize as the front sprocket shaft. The driven gear and it's drive gear also have a ratio sometimes referred to as an internal gear ratio. All in all it is a numbers game and best left to the designers for the best compromise in power, speed and reliability of a given machine. Now I will sit back with a coffee and try to understand what I just said. lol.
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