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2B R <> 2B
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Discussion Starter #1
Which one of these is better and what does it mean....

Anybody...


Gear Ratio - 1st Gear 31/12 (2.583)

Gear Ratio - 2nd Gear 32/16 (2.000)

Gear Ratio - 3rd Gear 30/18 (1.667)

Gear Ratio - 4th Gear 26/18 (1.444)

Gear Ratio - 5th Gear 27/21 (1.286)

Gear Ratio - 6th Gear 23/20 (1.150)

or

Gear Ratio - 1st Gear 37/13 (2.846)

Gear Ratio - 2nd Gear 37/19 (1.947)

Gear Ratio - 3rd Gear 28/18 (1.556)

Gear Ratio - 4th Gear 32/24 (1.333)

Gear Ratio - 5th Gear 25/21 (1.190)

Gear Ratio - 6th Gear 26/24 (1.083)
 

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The second combo has more grunt off the line and more top end but the gears are much further apart so shifting will make a lot more movement in the revs making it harder to be smooth and accellerate evenly. The gearing in the first one is much closer gearing so the shifts will seem to change the revs less which depending on what you want can allow you change gears up and down with less change in speed and revs (smoother).
 

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Makes sense to me. My 07 feels like there is very little difference between the gears when I shift and shifting is very smooth and requires minimal throttle loss. The 2001 is a completely different engine and setup. They probably used the taller 1st gear because the engine needed it to get going and the other gears would've made it highway friendly. If you put the 01 gearing in the 07 it would be better low and high but all the shifting would make it horrible for racing.
 

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Alright, gearing 101:
The numbers you wrote in parenthesis ie Gear Ratio - 1st Gear 31/12 (2.583)
The higher the number is the lower the gear is (yes it can be confusing). Being a "low" gearing means that it accellerates faster but overruns the engine sooner (meaning it has a low top speed but gets there fast).
The opposite is also true. When the number is lower it is a higher gearing. This means that is gains speed slower but can go faster.
The difference in the numbers (this part is simple math) between gears is how "close" or "far" your overall gearing is. Close ratios are smoother because when you shift they do not change the RPMs very much (doesn't matter if you shift up or down). When they are farther apart they do change drastically.
So imagine (this is an extreme example not realistic) that you are riding in first gear...the bike is at 60mph and the engine is at 14,000 rpms and you shift to second gear and the RPMs drop to 4000 rpm and you hammer the throttle again how would the bike act? It would suck to drive because you have to rev it so high just to be able to shift. If you shifted at a lower RPM the engine would bog and stall. This would be a (extreme) far ratio gearing.
When I run my bike to 14000 and shift (in almost every gear) it only drops 2000-2500 rpms making the bike easy to keep high in the revs and it has power in each gear the same as the last.
Yours probably is still smooth because the ratios arent really that far apart but it would not be as smooth as the '07.
Does this help at all?
 

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Gearings are usually tailored to engine powerband as well. If the band is pretty big then the gearing can be farther apart. If the power band is smaller (like in the '07) then the gearing needs to be closer to be good for racing.
 

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2B R <> 2B
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Discussion Starter #9
Thanks - We dont have a race track like other places - Just Drag and allot of street racing... That really explained allot because a friend with a newer bike was asking me why I take off much faster... I will tell him to read this post instead of trying to explain... I know I am not the only person who was lost on this one....

I really trying to figure what we can do to catch up with a R1...

The sporkets on a R1 are smaller than a R6 so I am trying to figure what we can do to close the gap..
 

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The sprockets are the final gear ratio you have to look at on a bike. No matter what the trans ratios are the sprockets can make a bike slow or fast because they are referred to as the final drive ratio. They are the last gearing that the bike goes through before power reaches the ground. Thats why a lot of guys go -1 front, +2 rear. That makes the ratio number higher (making the gearing lower). This makes the "grunt" better but you lose some top speed (also makes your speedo wrong). The R1 is a different animal. If you haven't checked the HP difference is severe. R6 is on average 115HP (at the engine) R1's run around 175Hp at the engine. Increasing the HP on vehicle that weighs about the same will make it faster in most circumstances. You could change your sprockets to keep up with the R1 off the line or at top speed but doing both would be much more difficult.
With that said theres another lesson for another time. Horsepower to Weight Ratio (which is also why we beat the crap out of cars).
 

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I paid attention in detail last night for you when I was shifting. The 07 changes RPM between only 900-1100 RPM's when shifting in any gear. I would be interested to see how this compares to yours.
 
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