[Hatcho]

This is a very handy tool which details the effect of changing the gearing on your bike (increase/reduce teeth on front/rear sprockets). Might be worth making this one a sticky methinks.

[KaosTheory]

Hatcho, on Jun 16 2010, 10:23 AM, said:

This is a very handy tool which details the effect of changing the gearing on your bike (increase/reduce teeth on front/rear sprockets). Might be worth making this one a sticky methinks.

That...is...awesome. Nice find.

Kaos

[Larry]

Oh man, that is deadly.

I'm thinking of changing the gearing on the Aprilia and that was very useful.

[Hatcho]

Larry, on 03 January 2011 - 09:26 PM, said:

Oh man, that is deadly.

I'm thinking of changing the gearing on the Aprilia and that was very useful.

Thinking of going up a few teeth on the back?

[Larry]

Hatcho, on 03 January 2011 - 09:38 PM, said:

Thinking of going up a few teeth on the back?

Indeed I am, i'll prob just go from 41 to 42 for now.

[Hatcho]

Larry, on 03 January 2011 - 09:47 PM, said:

Indeed I am, i'll prob just go from 41 to 42 for now.

I went up two teeth on the rear sprocket - tis well worth it. Cheapest performance mod out there. Means the speedo reads a little high (didn't bother with a speedohealer), but twisting the right hand is just that little bit more fun now!

[Larry]

Hatcho, on 03 January 2011 - 09:54 PM, said:

I went up two teeth on the rear sprocket - tis well worth it. Cheapest performance mod out there. Means the speedo reads a little high (didn't bother with a speedohealer), but twisting the right hand is just that little bit more fun now!

Speedo on the Falco is attached to the rear disk so there shouldn't be any difference there.

Hmmmmmmmmmmm....................two teeth you say.............strokes chin.

[The Mex]

Loosing 30KPH with the custom setup on the 900R

[Super10]

Hatcho, on 03 January 2011 - 09:54 PM, said:

I went up two teeth on the rear sprocket - tis well worth it... ... ...

Larry, on 03 January 2011 - 10:00 PM, said:

... ...
Hmmmmmmmmmmm....................two teeth you say.............strokes chin.

going 'down' 1, at the front sprocket is roughly the same as 'up 2' at the back,
but it makes little difference to the chain length.

at times, I found when changing to a larger rere sprocket, the chain was now too short
(even only a couple of teeth)

(also, fiddling the front sprocket may (?) be easier than taking back end apart)



as Hatcho said, it just has to be the cheapest performance mod going.

(damn those BM shaftdrives, lol)

.

[Hatcho]

Super10, on 05 January 2011 - 02:08 PM, said:

going 'down' 1, at the front sprocket is roughly the same as 'up 2' at the back,
but it makes little difference to the chain length.

at times, I found when changing to a larger rere sprocket, the chain was now too short
(even only a couple of teeth)

(also, fiddling the front sprocket may (?) be easier than taking back end apart)



as Hatcho said, it just has to be the cheapest performance mod going.

(damn those BM shaftdrives, lol)

.

Thought about doing the same myself, but was advised that the reduction in the size of the front sprocket (from 17 to 16 teeth in the SV's case) would result in a tighter 'turning curve' for the chain as it looped around the sprocket. That said, I've never heard of anyone having issues when they dropped a tooth up front on their SVs. Couple of lads in the US actually did both (up 2 at the back, down 1 on the front) but I think they were just mad to wheelie all the time!!

[ajoe90]

Nice find Hatcho, must plug in the figures for the craic when i get the chance and some free time.

I've dropped 1 tooth off the front on loads of bikes I've had, 2 x Superdukes, RC8, Fireblade, R1, etc etc and never had a problem with any of them apart from "feeling" faster on the pick up and the lumpy twins being more manageable at slow town speeds etc. I have heard people comment on reduced chain-swingarm clearance due to smaller diameter front sprocket which could cause chain rubbing in a part of the swing arm or on the chain guide rubbers but I haven't found it an issue. People also comment on excessive chain wear for same reason but to be honest, people often complain about reduced chain life after 5000 miles. Solution: clean, adjust & lubricate your chain correctly and you'll easily get 3 times that out of it (bike/power/cockhanded right hand dependant).

As S10 said, going up 2 on the back can lead to the chain being too short due to increased diameter of rear sprocket.

Folks, for about 20mins work and €15 for a front sprocket...................do it, you'll be amazed at the difference it makes to the "spriteliness" of the bike. Only downside is loosing top speed capability, but to be fair, how many of us max out the bikes every week going on our weekly ride? ( )

Again, good find Sean, have seen em before but none as comprehensive as this one

ajoe90

[sp1v]

Good find Sean Bookmarked!!

[Positron]

Great link.

Sorry about the zombie thread resurrection, but I was looking at improving the motorway mpg on the Fazer. (I know, I am cheap, I am already getting like 4.3 l/100km too!! ). Read elsewhere that increase stock front sprocket from 16T to 17T could the bike much more efficient (lower rpm to maintain motorway+ speeds). Obviously there would be some deterioration when trying to pull away, but even the restricted Fazer pulls away way quicker than most cars on the roads anyway.

[Chris P. Bacon]

Works either way depending on what bike configuration you have - many modern fours have as standard loads of torque at the upper end of the rev range. My CBF250 for example needs to be kept in the 8000/10000 rpm to keep it spinning happily, unlike the Bonnie where it's a good deal lower (no idea as I've no rev counter). It would seem pointless to raise the front sprocket from the standard 13 tooth to a 14,where as with the [5 speed] Bonnie I noticed searching for that magical 6th gear on motorways! Seeing that I have oodles of torque on the twin, I went from a 18 tooth to a 19 tooth and the differance was well noticable. By far the best €20 mod I've made to that bike. Strange but I noted it made no differance to my mpg! Motorway riding is far more relaxed and has made no additional pressure to date on the clutch - t'is a joy to ride