im getting a new chain with sprockets for my cbr f2 and im not sure if i should keep my stock gearing (15,43) or gear it up or down.

if i go with a 14 tooth or 16 tooth front what will be the mph diffrence top end? if i need to run i need to gtfo and be able to reach atleast 140mph. but i would love the low end it would have it i geared it down! is it even noticible just going one tooth up or down on the front?

 

First off I hope that by gtfo you mean by gettin away from someone endangering you and not runnin from the police cause we don't like that talk around here, and second yes you will notice a little more grunt on the low end with one tooth, I think if you go 1 down front you'll prob loose 5 mph top if you go 2 down front 1 up back prob loose 10-15, goin up teeth prob won't do much cause the bike will run out of power before it hits top or it'll take forever to get there

 

hmm i know what you mean because it does tend to give up at high end anyways but i do have jets exhaust/air filter with a tune but either way i dont think it would go any more than 160 max with gearing. think im going to stick to tock gearing as i need that top end...

 

How often are you hitting triple digit speed?
And why?
Are you riding on the track mostly?
Or on public roads?

 

Just did -1+2 really gets up and goes now and I don't need to go 150+ anyway.

 

How badly does going down a tooth kill your rpms on the highway? I need a new chain and am going to replace the sprockets. I don't want to go down a tooth and be at like 8k at 60mph on the highway.

 

Gearing Commander: Motorcycle Speed, RPM, Chain & Sprockets Calculator

 

That gearing commander is off a little, says max rpm is 12750 and I think if
you goto the rev limiter it's 14200 redline on my tack says 14000.
So with -1+2 top speed should be 153mph at 14200.

 

went with the same gearing since im always in the power band the way it is already! thanks for the input though! cant help myself from hitting triple digit speeds every now and then same goes with my car to... i try to keep it safe though!