Gearing And Sprocket Size

[pschrauber]

I' am "fiddeling" with gearing of my bike (Aprilia TXR) to find the ratio that fit's to my riding /personal taste.

First try was:

42 rear + 12 front which was to high,

42 rear + 11 front was too slow,

42/12 = 3.50

42/11 = 3.82

Now there are two possibilities:

40/11 = 3.63

44/12 = 3.74 (with a half link)

Which won to choose:

a smaller rear sprocket won't be hit so easy accidentally then a bigger one.

Then again a 11 teeth front sprocket will wear faster is difficult to get thus expensive compared to a 12 teeth.

What would you choose or any better ratios?

[copemech]

Good chains with half link availability are expensive as well  Nothing wrong with 11teeth as most modern bikes will tell.

[tony27]

40/11 is basically halfway. You half both fronts already so just get your 40 & try it would be my suggestion 

[pschrauber]

I was uncertain the 11teeth is so small compared to the original mounted 13teeth I believe it is that impression and the fact that the swing arm axle is mounted high so the upper part of the chain climbs a bit up rests on the the chain guide and then travels down to the sprocket.

When you have mounted a 13 front and 42 at the rear it does not happen.

Therefore I asked too?

[b40rt]

Patrik, I've pm you.

[pschrauber]

Thanks Ross,

 

will get the smaller sprockets front and rear.

 

My concern was that there could be any negative impacts due the chain travelling upon the swing arm shaft but is from experience not the case.

 

See draft: