Sprocket Kits

[JonKerr]

I don't want wheelies, I want snap coming out of the corners. I'm thinking about the -1/+2. Just another thing to add to the list of things I want to spend money I don't have on. I swear between exhaust, double bubble windscreen, now gearing, going to need new tires in a few thousand miles again, full leathers, race boots, if I had $4000 to blow I'd be in heaven.

 

[porky45]

-2 rear = 16/44 = 0.364


BTW is it a fact that all our speedos are pretty much off by 8%???

yes it is.

 

[JonKerr]

Yeah about 8-10%. I think mine may be even more now with that Pirelli tire with the super tall crown. I figure if the speedo says 75 on the freeway I'm right about at the speed limit.

 

[Marthy]

how many links did you pull out of the chain to go -2? How many revs are turning in 6th at 70mph?

it's about 125 rpm per tooth. I was thinking about going big! I can take off easily in 2nd gear with my girlfriend on... Stock at 70 mine rev about 6000. If you go to a 38T on the rear (if it fit) it will rev around 5000.

 

[owldaddy]

Is it possible to do this to improve performance in response and acceleration w/o losing top speed? If anyone is more knowledgeable about this and could break it down for me, I'd really appreciate it.

It could be possible to get both, only if the bike won't redline in top gear. If changing the gearing so that you get more acceleration will also let the engine pull redline in top gear you can actually get both. I haven't tried to redline the 6R in top gear yet, but my experience with other bikes has been that they rarely pull redline in top gear. I'm sure someone on the board has tried to see how fast they can make the 6R go, they would know if reline in top gear is possible. As for me, I'm always looking for another gear (one that isn't there) while running at 70 mph, so changing the gearing to improve acceleration would be counter productive for me.

 

[porky45]

it's not that difficult to redline in top gear. you'll be going about 135ish with stock gearing and about 120 (corrected speed) with a -1/+2 sprocket swap.

 

[Hethrir]

okay, color me confused. so a -1 front sprocket = more snap off the line correct? if i did a -1 what would the sprocket be? a 15? (im not sure whats on our bike, im a technical illiterate.) and if all the above is correct, would i need to jack with the chain?

 

[elishatarvin]

i did a -1/+2 sprocket switch using driven sprockets. the stock chain still fits perfectly. definitely more get up and go off the line and as someone stated earlier, top end in 6th gear is about 120

 

[CDN6R]

Like some people here on the Forum I went +1 front sprocket (17 teeth). I haven't really noticed any major difference in accleration. I checked my fuel mileage the other day,after riding 225 KMS, and I got 65.5 MPG (Imperial Gallons) The best I got last year was 68 MPG,again Imperial Gallons. I feel that my speedo is now pretty accurate.

 

[Hethrir]

yea, got it figured out after digging more. too many mere mentions of sprocket changes, etc, to dig through! regardless I think im gonna do a -1 up front just to see what happens and decide if i want more. Also gonna look at a speedo healer, the state patrol in Colorado is evil so i want to know exactly what speed im going.

 

[Marthy]

Stock Ration 16/46 @ 70 MPH = 6400
17/46 = 6000
17/44 = 5750
15/48 = 7100

There is no such thing as "Stage 1,2,3 or what ever. Gear Ratio is all there is. What you gain on the bottom, you will loose it on top! Absolutely no magic here...

If you bring your bike to the track... make sure your about to hit the rev limiter right before the end of the longest strait away. But if you want a little more acceleration... well go smaller on the front or bigger on the rear.

Indysuperbike have about any single gear combo you can dream of. I got a Vortex 17/44 and quite happy with it. I can pop the front wheel off the ground about anythime I want in first gear and since I ride I-95 speedway most of the time I like a better top speed just to keep the rev down...

 

[72racer]

I went with +1 up front,speedo perfect ,slightly lower rpms,no noticeable loss in acceleration,less buzziness at hwy speeds,no grinding to fit,approx 1hr to complete change super happy with mod