Differences on fewer or more sprocket teeth

[Nosfertau]

Just been grabbing a few new parts from wemoto.com (very useful site for direct replacement parts for your exact bike) and i noticed in the sprocket section theire is a list:
Front Sprocket:
Standard
Less 1 tooth
Less 2 teeth
Plus 1 tooth
Plus 2 teeth

Rear Sprocket:
Standard
Plus 1 tooth
Plus 2 teeth
Plus 3 teeth

What is the general difference in adding or removing a tooth?
And what would be an adverage ratio (for tweeking purposes)

[-Ralph-]

Just been grabbing a few new parts from wemoto.com (very useful site for direct replacement parts for your exact bike) and i noticed in the sprocket section theire is a list:
Front Sprocket:
Standard
Less 1 tooth
Less 2 teeth
Plus 1 tooth
Plus 2 teeth

Rear Sprocket:
Standard
Plus 1 tooth
Plus 2 teeth
Plus 3 teeth

What is the general difference in adding or removing a tooth?
And what would be an adverage ratio (for tweeking purposes)

Most folk tend to go either 1 or 2 teeth up on the rear sprocket. I would recommend it, it improves acceleration and response and doesn't affect top speed because the SV does not rev out in top gear anyway, not that I have ever tried to hit top speed since mine was done. 120mph is a silly enough speed for me without trying to get to 135. The only negative is that on the motorway at a given speed, the bike rev's a bit more and
you sometimes find yourself trying to change into 6th gear when you are already there, and you use a little bit more fuel, but you get used to being at higher revs when on a high speed cruise, and you get used to it.

[Nosfertau]

Ace, well thankyou for that -Ralph-, i'll be ordering a new sprocket then, could do with a little better acceleration. feel sometimes im just not going anywhere lol Cheers again.

[hongman]

I was wondering the same thing.

So more teeth on back sprocket = more acceleration, more front teeth on front sprocket = ?

[yorkie_chris]

gearingcommander.com to see differences in rpm at given speeds

[hongman]

Nice site :o

[-Ralph-]

I was wondering the same thing.

So more teeth on back sprocket = more acceleration, more front teeth on front sprocket = ?

More teeth on back or less teeth on front = lower gearing and better acceleration

Less teeth on back or more teeth on front = higher gearing

Higher gearing may be beneficial if you are looking to reduce revs for a more relaxed cruising speed (and possibly better economy but this would depend on the bike) but on an SV it would not increase top speed as it cannot rev to the limiter in top gear. Power is the limitation, not the gearing.

On a bike that can rev to the limiter you would increase or decrease top speed, until your gearing gets so high that the bike doesn't have the power to pull to the limiter any more.

I've never heard of someone using higher gearing on an SV and I don't know why you'd want to do it.

[DarrenSV650S]

You never had meccano when you were a kid did you ;)

[Berlin]

Going down one tooth on the front is the same as going up about 2.5 teeth at the rear and Vise Versa.

The original gearing on my 600 gixer is 16/45. I'm presently running 15/47 and it'll wheelie on the throttle in first second and third. :)

For the next race I'm running 14/47 and may just struggle to keep the front on the tarmac at all :O)

Unless you have a speedo thats geared from the front wheel, changing the sprockets will make the speedo read wrong.


C

[hollayzfr1]

I just changed my front Sprocket for a 14 tooth one. Change isn't as drastic as I had hoped for.

So now going up 3 on the Rear. Will let you know the results. I'll be running 14/48 in the end. Standard 15/45.

I have been told that I will need to replace the chain for one with an extra 2 links(112).

Hopefully my bike will be as wheelie happy as Berlin's :)

[Berlin]

I tried to go 15/49 and the spindle wouldn't go through the rear wheel so it looks like you'll need that longer chain.

[Red Herring]

Don't go to mad lowering the gearing, eventually you get to the point where you might just as well have used a lower gear, in other words 2nd becomes 3rd etc etc... You will still get the advantage of a closer ratio box, but the SV has such a broad spread of power even that isn't so critical.

[embee]

My curvey SVS has +1 on the gearbox (16/44) so it is a little more relaxed for distances. As RH suggests, this puts the higher gears pretty much half-a-ratio higher, so now 5th is halfway between what 5th and 6th was as std, and 6th is now like "6 1/2 th". If I want a lower gear I just change down.

Look at it this way, given the opportunity would you have a 7th gear in the box, just for cruising? The other 6 are still there just the same. My 5th is still lower than the std 6th was, so there's always a lower gear available except for first and pulling away.

It's down to personal taste really.

[dizzyblonde]

My curvey SVS has +1 on the gearbox (16/44) so it is a little more relaxed for distances. As RH suggests, this puts the higher gears pretty much half-a-ratio higher, so now 5th is halfway between what 5th and 6th was as std, and 6th is now like "6 1/2 th". If I want a lower gear I just change down.

It's down to personal taste really.

Indeedy the same as mine.
I notice that circa 5k in revs in first gear I can be doing 40mph, compared to 30 in the same revs(off top of my head)
Same with sixth gear, its something like 90mph circa 6k revs compared to 7k on standard 'S' front sprocket.

All for a nice jolly relaxed zoom on motorways, just needs some slight differing in riding to standard around town etc, not as quick off the mark at a set of lights. Plus its less vibey, and slightly better for fuel economy, noticed more when you are doing 200 mile rides in boring straight lines:cool:

[-Ralph-]

My curvey SVS has +1 on the gearbox (16/44) so it is a little more relaxed for distances. As RH suggests, this puts the higher gears pretty much half-a-ratio higher, so now 5th is halfway between what 5th and 6th was as std, and 6th is now like "6 1/2 th". If I want a lower gear I just change down.

Look at it this way, given the opportunity would you have a 7th gear in the box, just for cruising? The other 6 are still there just the same. My 5th is still lower than the std 6th was, so there's always a lower gear available except for first and pulling away.

It's down to personal taste really.

Indeedy the same as mine.
I notice that circa 5k in revs in first gear I can be doing 40mph, compared to 30 in the same revs(off top of my head)
Same with sixth gear, its something like 90mph circa 6k revs compared to 7k on standard 'S' front sprocket.

All for a nice jolly relaxed zoom on motorways, just needs some slight differing in riding to standard around town etc, not as quick off the mark at a set of lights. Plus its less vibey, and slightly better for fuel economy, noticed more when you are doing 200 mile rides in boring straight lines:cool:

Interesting. Do you guys have any issues in slow traffic, or tight turns, in 1st gear where you find you are having to slip the clutch to avoid chain lash?

[zachl]

would be interesting to see the results of changing the front sprocket down a tooth or two,

my only complaint about the sv is that the accelerations isnt as good as my cbr 600 was,

so if this can be improved at a relatively cheap cost and not affect the speedo, that would be awsome..

advice?

[yorkie_chris]

20bhp deficit might have something to do with it?

[zachl]

yeh i know the lol, well i dont knoe what bhp my sv is but the cbr was 110,

but i did think it would be quicker

[carternd]

yeh i know the lol, well i dont knoe what bhp my sv is but the cbr was 110,

but i did think it would be quicker

SV is 71 bhp, 45.8 lb-ft. (Curvy.)

So 40bhp less.

[zachl]

mines a 2007, pointy though? sport (if that makes any difference...)

[Red Herring]

I run one tooth less on the front of my SV, but it's a naked one and i hardly ever go on the motorway with it. I'm not sure if it really makes that much difference to outright acceleration, but it does bring the gears slightly closer together as i said earlier making the bike slightly less gear critical (you can get away with being in the wrong gear more).

[dizzyblonde]

Interesting. Do you guys have any issues in slow traffic, or tight turns, in 1st gear where you find you are having to slip the clutch to avoid chain lash?

Don't have any issues in slow traffic Ralph at all. Tighter turns I have to be slightly more careful, but thats more down to the rider not the bike, I'm not particularly good at being fistaplenty!
I've never had to slip the clutch. Its just a bit slow off the mark from a set of lights or junction, thats all.

Peg took it out on Wednesday, and thought it was a right laugh, a nice bimbler compared to the ZZR, I think hes just converted to the curvy side, thought the gearing a tiny bit odd, but nothing drastic, but I did tell him first :-)

[yorkie_chris]

yeh i know the lol, well i dont knoe what bhp my sv is but the cbr was 110,

but i did think it would be quicker

what year CBR? There's not that much in it between steely ones, but the new RRRRRR ones are a lot stronger at top.

[zachl]

Wasn't an rrrrr mate, wish it was, just a 98 model, to be fair I have ridden my sv twice since I have had it and clocked up about 4 miles of steady 'learner' miles to learn the bike, maybe I'll comment after a few hundred lol

[yorkie_chris]

In that case OTFP (http://forums.sv650.org/album.php?albumid=563&pictureid=4041)

[DarrenChay]

I've just had a new chain fitted with standard 'S' sprockets.

However, i think the rear sprocket could do with changing, and i like the idea of extra teeth to pep up acceleration a bit.

Question is, how many (if any) extra teeth could i go up at the back with the standard length chain?

cheers

Daz

[-Ralph-]

I've just had a new chain fitted with standard 'S' sprockets.

However, i think the rear sprocket could do with changing, and i like the idea of extra teeth to pep up acceleration a bit.

Question is, how many (if any) extra teeth could i go up at the back with the standard length chain?

cheers

Daz

http://www.gearingcommander.com/

Where about on the chain adjustment on your rear swingarm is the rear spindle? One or two links shouldn't need a longer chain, and I don't think you'd want to go up more than 2 teeth for road use.