Lets talk about Road America sprocket sizes - Chicagoland Sportbikes
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post #1 of 16 (permalink) Old 06-02-2008, 03:45 PM Thread Starter
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Lets talk about Road America sprocket sizes

What have you guys found to work?

2003 SV650 and 2003 ZX6R, trying to figure out what size sprockets to swap to for RA.

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post #2 of 16 (permalink) Old 06-02-2008, 03:48 PM
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post #3 of 16 (permalink) Old 06-02-2008, 03:57 PM
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post #4 of 16 (permalink) Old 06-02-2008, 04:09 PM
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stock gearing should work unless you have major motor work.

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post #5 of 16 (permalink) Old 06-02-2008, 04:28 PM
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I have one down in front and two up in back. Based on running that I think I would prefer stock.

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post #6 of 16 (permalink) Old 06-02-2008, 04:57 PM Thread Starter
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Hi Gu Daddy
What's up man, missed you at Blackhawk. I was hoping to see that sumo of yours in action... you too Rob!

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post #7 of 16 (permalink) Old 06-02-2008, 05:12 PM
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Quote:
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What have you guys found to work?

2003 SV650 and 2003 ZX6R, trying to figure out what size sprockets to swap to for RA.
I ran a 16/43 last year at RA on the built 1st Gen SV. I'm not sure if you're bike will pull it. Only one way to find out. I know for a fact when I had my stock SV out there it ran out of RPM in top gear with the stock gearing. I like to gear mine so I have about a grand or 1500 below redline before I get on the binders into turn 1, 5 and 12.

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post #8 of 16 (permalink) Old 06-02-2008, 05:53 PM
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Jon i'm in the same boat man..

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post #9 of 16 (permalink) Old 06-02-2008, 07:08 PM
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Just buy some sprockets guys. Try different gear ratios. Trial and error. That's why they give you "Practice" time before races.

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post #10 of 16 (permalink) Old 06-03-2008, 02:52 AM
 
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I have ran stock or 2 up rear depends on the winds that day. So Jon you will need 14/45 for your 636 Buddy
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post #11 of 16 (permalink) Old 06-03-2008, 08:14 AM Thread Starter
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Buy a stack of sprockets? But... but... I hate buying... anything

To be honest, I've never changed a sprocket that wasn't worn to hell in 4 years now, I guess it's time to change that around if I want to compete for anything.

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post #12 of 16 (permalink) Old 06-03-2008, 08:20 AM
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Jon, keep in mind that several things (in addition to your motor's power) will effect your gear selection.

1. Your tire brand will effect your gearing selection because of the differences in tire diameter. As a general rule, Dunlop and Michelin make small front tires and big rear tires whereas Pirelli and Bridgestone make a bigger front tire and smaller rear tire.

2. Your individual pace will also have an impact on your gearing. As a general rule, the better your corner speed the taller your gearing can potentially be.

The CCS and/or WERA forum is probably your best source of good info. Ask the right question though. Tell them your lap times, stock or built motor and tire brand.

HTH

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post #13 of 16 (permalink) Old 06-03-2008, 08:23 AM
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To be honest, I've never changed a sprocket that wasn't worn to hell in 4 years now, I guess it's time to change that around if I want to compete for anything.
Very true. I was on the wall running the pit board for Burrito during one of the races and I noticed your bike was geared much taller than the other bikes last weekend at Blackhawk. It was very distinct and noticeable as you went through the gears down the front straight.

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post #14 of 16 (permalink) Old 06-03-2008, 08:51 AM
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The weight of you and the motorcycle has a lot to do with whether or not your motorcycle can pull a certain gear ratio as well. This comes into play more with lower HP machines like your SV650. If you can shave weight off the bike/you it is more likely that your bike will be able to pull a taller gear.

Some easy weight saving tips for the SV are an aluminum subframe, smaller battery (you arent running lights) ect... basically get rid of any unneeded weight.

For the SV I recommend you order a 16 front for sure. Buy a couple rears and try them. I recommend a 44, 43 and maybe a 42. The stock is 15/45 correct? Buy a spare chain and try to keep your rear axle at a central spot in the swingarm. You should always have a spare chain anyway. I dont even buy the o-ring chains anymore. Buy the non o-ring with the correct tensile strength and keep it clean, they last just as long.

Pay attention to your RPMs and try to gear the bike so you aren't making unwanted gear changes or unneccessary gear changes. The less you shift gears the faster the lap times.

At BHF, Gingerman, Putnam, Grattan, Autobahn North I alway ran a 15/47 with the stock SV. With the built one I'm able to run a 15/44. I'm going to widdle as much weight as I can over the winter. Pick pick pick widdle widdle widdle....

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Last edited by Grasshopper; 06-03-2008 at 08:59 AM.
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post #15 of 16 (permalink) Old 06-03-2008, 12:39 PM Thread Starter
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Thanks Nick... on that note, I can't justify spending even a penny on weight savings on any bike until I drop about another 50lb of dead weight around my gut area first

Actually I think on my SV I'm running a 14 front and -2 on the rear whatever that is. It's ridiculously short gearing right now, I'm basically maxing it out at Blackhawk and bouncing off the rev limiter when I was at MAM.

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post #16 of 16 (permalink) Old 06-06-2008, 12:28 PM
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Anyone have input for gearing an 04 R6? As much as I'd like to do as above, and buy sprockets till I'm blue in the face....My bank for some reason just won't let me do that. Suggestions are much appreciated.

Andrew
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