Rear Sprocket

[AndyH 35]

I am thinking of experimenting with raising the overall gearing a touch

by replacing the rear sprocket with fewer teeth.Anyone already done this and if so

what were the results..43 teeth down to 40 or less.

I am assuming that the revs will be slighlty lower on a top gear cruise

,mpg should also increase a touch too.The bike should easily pull taller gears no

problem ...help appreciated chaps..

[Mick 162]

A smaller rear sprocket will cause the chain to run closer to the chain runner. Don't know if this causes problems? As Andy says has anyone done this?

[x11r 386]

When I put the CBR rear wheel in my X the Standard sprocket on the CBR carrier was 40t, the gearing became spot on for speedo etc well Sat nav showing 101mph and bike showing 100mph , I removed 2 links from the chain and there were no problems with the chain running too close to the swing arm. it only makes a few MM difference on diameter of the sprocket.

But believe it or not the MPG was worse on a 1000 mile trip to the German treffen , So I brought a Renthal replacement @ 43t and went back to standard gearing , the difference is approximately 7%, 

Bear in mind tho that Im running a shortened Akropovic full system so my results may not reflect the same results for every one.

[wayne 426]

Just returned from Belgium, 18t front 43t rear, fuel warning light came on at 170 miles. This combo makes speedo read almost spot on 1 mph fast compared to sat nav( speedo 80 sat nav 79 mph.

Exhaust has Akro headers but with twin silencers,(motad venom)

I get more mpg with original headers + the venom cans.

[AndyH 35]

What kind of revs is the bike pulling at 70 or 80mph with an 18 tooth front Wayne..

Is it quite a bit less then standard or not much difference??

[wayne 426]

about 500 rpm less