Sprocket size advice

[Fre530d]

Hello

 

I am looking for the ideal sprocket sizes for my bike.

 

I know the standard size is 14/41t.

 

I drive mainly roads and some trails so I need a good top speed.

 

I got douglas red label with maxxis street tires.

 

I don't now the sizes but the wheels are a lot smaller on the back than

 

the standard rims.

 

So i lost a lot of top speed.

 

The maximum is about 70mph.

 

I want to get to about 90 mph when possible.

 

My shee is practicly OEM but I'm gonna have a Noss head with 20cc domes,

 

a trinity stage IV exhaust, K&N pod's, right jets, dune port (probably)

 

 

So what sprocket size do I need to get to that kind of top speed, (a loss in bottom in not

 

important for me)?

 

Thx for the answers

 

Fred :wink:

Edited September 26, 2006 by Fre530d

[dajogejr]

Good luck...

Small tire size (I guess you got 18's) are gonna kill ya....

 

Here's a calculator to estimate, but it does not take into consideration if your motor can actually "pull" that gearing.

 

I'd say with a good strong dune port it might...but, 90MPH on an 18 inch rear tire...is gonna be hard.

You'll have to go 16/38 or so to do it...that's a HUGE gearing change....

 

When you say the wheels on back are smaller, do you mean the rim diameter, tire diameter???

 

Here's the calc:

 

http://home.earthlink.net/~gellett/banshee.htm

[Fre530d]

Good luck...

Small tire size (I guess you got 18's) are gonna kill ya....

 

Here's a calculator to estimate, but it does not take into consideration if your motor can actually "pull" that gearing.

 

I'd say with a good strong dune port it might...but, 90MPH on an 18 inch rear tire...is gonna be hard.

You'll have to go 16/38 or so to do it...that's a HUGE gearing change....

 

When you say the wheels on back are smaller, do you mean the rim diameter, tire diameter???

 

Here's the calc:

 

http://home.earthlink.net/~gellett/banshee.htm

 

The rims on the back are 18" and the tires that are on them are 225/40

 

THX

 

Fred

[dajogejr]

Fred...

The majority (I'd say 90%) of riders use their shees for trail or dunes, etc.

Obviously, you live in a location that allows for street driving...

 

In the future, this would be helpful info to know up front, since I'd say 95% of the people that read this post would assume you meant 18inch outside diameter on the rear tires...like a motocross tire...

 

Just trying to help a bit...

[Fre530d]

Fred...

The majority (I'd say 90%) of riders use their shees for trail or dunes, etc.

Obviously, you live in a location that allows for street driving...

 

In the future, this would be helpful info to know up front, since I'd say 95% of the people that read this post would assume you meant 18inch outside diameter on the rear tires...like a motocross tire...

 

Just trying to help a bit...

 

 

Thx for the help, :thumbsup:

[Fre530d]

Hello;

 

Puttin on a new sprocket with 17teeth today.

 

It goes a lot faster now and is more fun to cruise on low rpm

 

on the streets.

 

So when i use the converter I come at about 86Mph and I think

 

I am getting to that speed.

 

Not sure though,It doesn't rev quiet as high as before.

 

Probably not enough power?

 

But it's more pleasent to drive now.

 

When I get my trinity pipes the power will be raised a bit

 

so I hope it will be able to fully rev out 6th gear?

 

WFG

 

Fred

[EastCoast Banshee]

I think youll need alot more than pipes to pull a 17 to its full potential.