Gearing

[KLR600]

Apologies for making another thread on sprocket sizes but after reading through some older posts I'm suitably confused!

I'm putting my project XJ back on the road following a highly annoying incident with my regular XJ (damn, I must think of names to seperate the two!) and after delving a little deeper into my project XJ I noticed it could use a new front sprocket so off I go to wemoto to see how much they are and they're only £12 for the front and £24 for the rear and there's options for more/less teeth so I was thinking to mess with the sprocket sizes for a bit more acceleration. The chain on the XJ is new as it was just put on when I got it by the last owner just before I got it so I'm assuming it's the standard length fr the bike.

So anyway, my question is if I go 1 tooth up on the back sprocket and 1 tooth down on the front sprocket will I be able to keep the chain at the standard size?

Thanks
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[ms51ves3]

As far as I am aware no, as it's all to do with ratios.

Lets say the front sprocket has 1 tooth to every 3 at the back.
You would need to drop 3 at the back and up it 1 on the front to keep the chain the same length.

[Phil_P]

The ratios are only an issue when it comes to working out how to keep the gearing the same. If you take a link out at one end, and add a link at the other you will be just fine.
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Moto Guzzi 1100 Sport Injection '96

[KLR600]

Yeah I had a feeling it wasn't as simple as I thought it was!

My options for sprockets are:

Rear standard size
Rear standard + 1 tooth

Front standard size
Front standard - 1 tooth
Front standard - 2 teeth

I want to downgear it to see what it's like and make it a bit more peppy but I want to keep the standard chain length just to make it easier for now, does anyone have any idea what sprockets I'd need?

Thanks
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Now: '00 Kawasaki ZRX1100R - Past: '84 Yamaha DT125, '89 Kawasaki KLR600, '97 Yamaha XJ600N
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[KLR600]

[Phil_P]

Should be fine. In many cases adding or taking away a tooth at only one end can be accommodated with the chain adjustment anyway.

If you think about what you are doing, by adding a tooth at one end, you add half a link of chain (one roller) if you take away a tooth at the other, you take away half a link (one roller) +1/2 minus 1/2 takes us back to where we were.

I anyone isn't sure about what I'm saying, cut out some cardboard disks and loop a string round them, you can soon prove to yourself that all will be A-OK.

If you want to maintain a constant ratio, then if you increase the gearbox sprocket by one tooth, then you would probably have to increase the rear wheel sprocket by three teeth, and probably fit a longer chain.
____________________
It is not enough to win, others must fail.
Moto Guzzi 1100 Sport Injection '96

[garth]

I'm going to downgear my xj to buggery!

I'll let you know.
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