[Gremlinsteve]

Are you able to reuse the stock chain ?

[Starpeve]

Are you able to reuse the stock chain ?

Yep. Easiest mod you can do!

[daytonadean]

https://chainsandsprockets.co.uk/

£9.27 with uk free delivery

[biscot]

May I ask why you are doing this and how it is affecting performance, etc.

[Jack Straw]

Going up a tooth on the countershaft sprocket will give you slightly lower rpm at cruising speed.  Typically one tooth will drop the revs around 450 rpm at 60 mph in top gear.  Such "higher gearing" will slightly reduce acceleration but make for  somewhat more tranquil highway cruising and possibly improve MPG under some circumstances.

Going down a tooth, say to a 14 has the opposite effect.

[Gremlinsteve]

I feel it’s a better choice for my current 865 cc build

[biscot]

So I gather the stock sprocket is 15T.
Is that easier/better/cheaper than changing the rear sprocket?

[Jack Straw]

Yeah, it's usually less hassle than changing the rear, cheaper too. 

[Gremlinsteve]

I agree
Plus I already have the front sprocket
Ready to install

[Starpeve]

So I gather the stock sprocket is 15T.
Is that easier/better/cheaper than changing the rear sprocket?

Easier and cheaper by far. Contrary to the theoretical reduction in acceleration, I feel that my bike is now quicker due to the  better gearing. Some will argue this point, but most that do haven’t done the swap. BTW my dressed weight is about 80 kg.
To me, the bike feels nicer now in 2nd and 3rd, where acceleration-wise is mainly where it’s needed.
Only a small change, but effective.
And it’s such a cheap and simple thing to do that it’s easily reversed if you don’t like it!

[biscot]

Sounds like it’s worth a try, I think I’ll give it a go. Thanks.

[RecoilRob]

Just installed the 16T countershaft sprocket and the bike really has taken to it well.   No more trying to shift into '7th' gear and the gearing in 5th now is almost identical to the stock 15T in 6th.   Engine pulls the additional gearing just fine and to my senses it feels happier with the slightly taller gear.   60 mph is showing 3600 revs in 6th and I've always liked tall gearing....because you can always downshift if you want more revs but once you've run out of gears you can't upshift to lower them.   Stock chain fit just fine and the 17T might actually fit...but unless the motor finds more torque I'm going to leave it at 16T...a very happy setup.

[Starpeve]

Just installed the 16T countershaft sprocket and the bike really has taken to it well.   No more trying to shift into '7th' gear and the gearing in 5th now is almost identical to the stock 15T in 6th.   Engine pulls the additional gearing just fine and to my senses it feels happier with the slightly taller gear.   60 mph is showing 3600 revs in 6th and I've always liked tall gearing....because you can always downshift if you want more revs but once you've run out of gears you can't upshift to lower them.   Stock chain fit just fine and the 17T might actually fit...but unless the motor finds more torque I'm going to leave it at 16T...a very happy setup.

Apparently the chain’s too short for 17. Not much room in there either. I copped a lot of grief ( and some support) a while back about my theorising about the taller gearing, before I’d done it. I love it, I think it’s a great improvement, things are better positioned everywhere, hated the short first. 2nd and 3rd are now closer to where I like them, etc. I’m still casually toying with the idea of, come replacement time, going 2 teeth down on the rear. As it is, contrary to speculative opinion, I reckon the bike’s quicker down low because of the better gear placement. What you MAY lose (if at all) on first you gain on 2nd.
Mind you, I’m only 72 kg and don’t take pillions.

[Starpeve]

Sorry, just realised I’m repeating myself! And that I weighed myself the other day and I’m lighter than I thought! Obviously the beer gut isn’t as heavy as I’d anticipated!

[CPJS]

https://chainsandsprockets.co.uk/

£9.27 with uk free delivery

Do you have a part number please.
I tried looking it up without success.