Although I cant imagine it would be a good idea to get a 14t front or a 47t rear if you ever go near the motorway.

Why? :?

Higher revs resulting in reduced fuel economy and more vibes, obviously.

I've not noticed much of a difference in fuel economy, maybe 1-2mpg if that and that's thrashing it between lights all the time, and definitely not much more vibes either, but then I do have the Suzuki sprocket with the rubber damper on it.

The rubbery bits on the standard sprocket are to reduce noise, not vibes.

FS has a point though, if you lower the gearing, at any given speed the revs go up, (yes, you know this I know), whether the revs rise as far as being a problem depends on the amount of change, and how the individual feels about it, I suspect a difference of a few hundred wouldn't be a problem - but it depends on the specific use to which you put the bike, and how hard you are :lol:

Tahir's fookin 'ard.

Since when where there traffic lights on the motorways?

If the speedo is driven off the gearbox, it will also give false readings. You will need one of these if this is the case.

So what should I expect from the 47 tooth rear sprocket, my SV happens to be exactly like yours - is it even worth it?

I never said there were, but in your first post you wrote "although I cant imagine it would be a good idea to get a 14t front or a 47t rear if you ever go near the motorway." , which I think is very different to saying if you're a regular motorway user, as what you said includes those who occasionally or very rarely use them, like myself. Hence riding in the city would have a far greater affect on fuel economy than riding on the motorway because of all the stop-start riding and the mini races between traffic lights instead of the smooth riding at a constant velocity that you would be doing on motorways, and I was pointing out how it doesn't make that much of a difference.

If you are a regular motorway user then yes you are making a good point, but this has been discussed in the past so anyone who frequently uses the motorway should be thinking about increasing rather than reducing the gear ratio anyway as acceleration wouldn't be that important.

Ah, thanks for clearing that up. :oops:

Yeah right :D. I just think on a standard bike it's not a huge change, and if you work out the ratio it's actually a very small change in ratios, so you don't have to be hard, you just have to get over the placebo affect of thinking it's a lot better than it really is.

If you need to change your chain/sprockets then, as long as you're not regularly using motorways, you might as well do it as it's not going to cost you more really, but I wouldn't spend the money getting the chain/sprockets changed just because you want to try and get better acceleration.

on a K3 where is the speedo readout from?
is it from the front wheel or the gearbox?

and wold it affect the read out if oyu changed the cog size?