Changing Gears with Correct Ratio - Correct Method?

[potblack2win]

Hi Guys,

Just got my new bike which has 2 gears on front derailer (1 large and 1 small) and has 9 speed cassette on the rear derailer.
I normally use the largest cog at front and switch between gears 5-9 which have been told to prevent cross chaining.

Am I correct in following the chart below

 

[Big John]

I'm confused. You have a double at the front and the diagram is for a triple. So in answer to your original question the answer is no. But the principle is roughly the same.

 

[potblack2win]

I'm confused. You have a double at the front and the diagram is for a triple. So in answer to your original question the answer is no. But the principle is roughly the same.

Yeh - The diagram has 3 chainrings at front but on my bike only have two. 1 large and 1 small.

That's good to here. Hopefully get a lot of life out my bike

 

[Ajax Bay]

Your chainset has two chainrings: outer and inner. Your cassette has 9 sprockets: let's call the largest 1 and the smallest 9.
On the flat you'll be on the outer/large ring and on sprockets 9 - 3. If you need to go to 2 worth considering shift down at the front and going to 'say' 5 at the back. Looking ahead will guide whether that's best.
Up more than a gentle hill (or a short one) best to be in the inner chainring: which avoids shifting at the front under force. And over the top shift back up to the large ring.
Avoid cross-chaining, but it's not a big deal. The front derailleur may rub - and the sound will tell you to shift at the front.
Have a play with this (I have gone for 50-34 and 11-28 with road bike (622 wheels shod with 28mm tyres)).