Gearing?

[Khalid 171]

I have a question about gearing. I know what it does to the bike and if you drop a tooth in the front or go up in the rear it gives it more low end power, but what exactly does it do? What would your dyno look like before and after? I know it doesn't add any horsepower. Does it give you the exact same HP and Torque curve as before but at different rpms? So basically instead of max power at 12500 it will bring it down to like 10500?

[Hoopty]

It means your top speed is lower (you are a higher RPM at the same speed), but you get there faster.

[Anonymous]

Does it give you the exact same HP and Torque curve as before but at different rpms?

No, it gives you the same HP and Torque curve but at different speeds. Basically, you'll be getting more HP to the wheel at a lower speed. And like Hoopty said, you'll loose a little off your top speed.

If you want to play around with gearing and see how it affects your top speed, go here:
http://www.cosportbikeclub.org/misc/SpeedCalc.html

[Khalid 171]

So your dyno curve looks the same? I know you get there faster. I geared my R6 1 down front and 1 up in the rear and it made a huge differance. I just didn't know the techniqalities(sp) of it. But I think I get it. Thanks Hoopty.

Edit: Just saw your post spiderman also. Thanks and will check out that link.

[Anonymous]

So your dyno curve looks the same?

Identical.

[thunderseye]

how exactly do you re gear a bike is it hard? does anyone here do it for a price?

[BenDover]

Easy, just change your sprockets.

[thunderseye]

can anyone help with that. i wouldn't even know which ones to get. or have a way to change them

[Khalid 171]

can anyone help with that. i wouldn't even know which ones to get. or have a way to change them

I can help you with this. Just let me know and I will try and help out.

[Ripper]

Here's a speed calculator, that will help you see the hard numbers, the results will be different for you bike, as this example is for the 99'-02' R6.. and I have found this to be extremely accurate, even at this altitude.

http://www.yzfr6.net/sprocket_speed.php

[thunderseye]

what would you recommend for a cbr 954

[Khalid 171]

what would you recommend for a cbr 954

I would keep it the same, unless you want to wheelie easier. If so, all I would do would drop 1 tooth in the front, which means instead of a 16 tooth sprocket you put on a 15 tooth sprocket, plus you can still use your stock chain. I believe yours is a 16 tooth, but not a 100% sure. You can get a new front sprocket for about $20. I got 2 new sprockets (front and rear) and a new chain from www.sprocketcenter.com They were really great guys and shipped it out the same day I ordered it. Now it might not be worth ordering just a front sprocket, because it is like $7 to ship from there, so it might be cheaper to just buy one locally. So check around and see a price, and if not get one from those guys. Just ask if you have any more questions, or if you order it and need help putting it on.

[Anonymous]

what would you recommend for a cbr 954

How many miles on the bike? If there's not many, you should be able to get away with just changing one or both sprockets, but if you've got a bunch of miles, you'll probably going to want to change everything out (new chain and sprockets), and if that's the case, you might want to consider going to a 520 conversion (thinner sprockets & chains = less weight = even faster accelleration).

[thunderseye]

well i have about 8000 miles

[thunderseye]

do i have to take the tire off to take the chain and sprockets off?

[KooLaid]

Take the rear wheel off to replace the rear sprocket but not needed to replace just the front sprocket. You will at the least, need to loosen the axle and slide the wheel all the way forward to get enough slack to replace the front sprocket. Either way, it's still really simple if you have a second body to assist.

[thunderseye]

and hopefully a second body whos done it before

[KooLaid]

It's a VERY simple thing, even your gf or mom could help out with something like that. All the other body does is, step down on the brake pedal really.

[Anonymous]

Here's a speed calculator, that will help you see the hard numbers, the results will be different for you bike, as this example is for the 99'-02' R6.. and I have found this to be extremely accurate, even at this altitude.

http://www.yzfr6.net/sprocket_speed.php

Umm...

Sprocket gearing and relation to speed doesn't change with altitude, yo.

[KooLaid]

Damn ralph! Good eye!

[thunderseye]

well i was playing out in the road near my house and bounced up a bit higher then i have before anyway. maybe i'll wait on the gearing

[KooLaid]

Yeah, techique and skill will beat out gearing your bike -1/+2. I can bounce up my 600 in 2nd w/stock gearing about a foot or so, but that's it. So I'm certain your 954 could walk all over mine in 2nd.

[thunderseye]

for bouncing up a wheelie is it easier if i have my two suspension knobs on hard or soft

[KooLaid]

I think soft suspension helps out alot. But because of stunts and wheelies, my once firm (no jokes damn it!) suspension is now a mush ball from stunts.