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Author Topic: Gearing in general  (Read 1364 times)

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rideby

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Gearing in general
« on: December 21, 2006, 08:04:12 pm »
I was told by an ex racer friend of mine that 3.0 was good for most tracks. I tried this at track days and at races and found that it was way too low. I would be topped out in 6th gear no later than 1/2 way down the straight.

I run the southeast area. daytona, Jennings, CMP, Barber, Roebling, VIR and am currently running an 06 R6. I have tried a couple of different sprockets on the rear and just cant seem to get it dialed in, I am either too high or two low to get good drives out of the corners and to have good top end on the straights. it seems like I can gain on a corner and lose on a straight and vise versa but cant seem to get the best of both worlds. Track days do not allow enough time to change gearing often and test them. With a couple of quick practice sessions at the races I am just screwed if I am not close to start off with.

This is going to be my second year and have worked out most of my beginners little problems and have settled down to one bike to work with. Is there a starting point rule of thumb for each track? (besides walking around and peeking at the gearing of other bikes at the track)

 I noticed on the USGPRU site they post some gearing suggestions for different tracks, It sure would be nice if the CCS site did also.

So if any of you could help me out with some starting point gearing for these tracks for my 06 R6 it would be greatly appreciated. I'm not out there for a factory ride, I am just an old man out there to have fun, go fast and come home in one piece.

thanks!

rideby
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Super Dave

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Re: Gearing in general
« Reply #1 on: December 22, 2006, 08:10:21 am »
Ratios internally are so different that I don't think you can blanket state that 3.0 is good.  Going from the current R6 to the previous R6's, the sprockets one uses are pretty different.

Do you need more sprocket choices?  If you're too high or too low, you should change it.  Skip a track day session and get it right.  That's why you're there.  Topped out in sixth is just useless.
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Super Dave

rideby

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Re: Gearing in general
« Reply #2 on: December 22, 2006, 06:23:36 pm »
thanks for the reply dave.

Rideby
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K3 Chris Onwiler

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Re: Gearing in general
« Reply #3 on: December 22, 2006, 10:30:17 pm »
Just as a general statement, when changing from stock gearing, adding two teeth to the rear sprocket and taking one away from the front is a great place to start for shorter tracks.  Then you can use the stock sprocket on the front with the +2 rear sprocket for a faster track.

To determine gear ratio, devide the rear sprocket by the front.
Example:  15 front, 45 rear = 3.00 to 1 ratio.

Stock GSXR 17 front, 42 rear = 2.47 to 1 ratio.

1 down 2 up on my GSXR is 16 front, 45 rear.  That's a 2.81 ratio, and it's as short as I ever run. 

A 17-44 works great for me at Road America, which is a long, fast track.
That's a 2.52 to 1 ratio.

So if you carry your stock number rear sprocket and +1, +2, +3 for the rear, and stock number front and a -1 sprocket for the front, you should have gears for any situation.
My GSXR runs a 17-42  gearset stock, so I carry 16, 17, 42, 43, 44, and 45 sprockets with me to the track.

Lightweight racers generally gear their bikes to top out sixth no matter where they race.  For a 600 or larger, try this instead.  At a really short, stop and go kind of track, gear to only use the first five speeds in your gearbox.  Use all six speeds for Brainerd, Daytona, Road America, ect.
« Last Edit: December 22, 2006, 10:42:43 pm by K3 Chris Onwiler »
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rideby

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Re: Gearing in general
« Reply #4 on: December 24, 2006, 05:53:06 am »
Thank you for your help and support, I will take your advice to the track this year.

I wish everyone a Merry christmas and a Happy New Year!

rideby :cheers:
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